Archive of Our Own

Katsuki isn’t always a “slave to his lust”, contrary to what others might think. But there was this one night last year when he just wanted to destress after a mission that nearly depleted the last of his patience. One night of alcohol and poor decisions changed his life forever.

Unfortunately (or maybe fortunately), he forgot to use protection. A single mistake that resulted in a massive responsibility.

Kota’s arrival comes without warning. One night, someone just leaves him in front of Katsuki’s agency, tucked inside a box overflowing with plush pillows. At first, the pro hero couldn’t believe it. He thinks it’s just a sick joke, or maybe a villain’s trap. But after a DNA test, his world shatters (and reconstructs itself). It’s a definite positive… he is the father.

Katsuki soon realizes that climbing to the top of the hero rankings is far easier than finding a decent partner to help raise a child. Within two months, six babysitters have already cycled through his standards, and every single one of them failed. It’s a roster of disasters: the negligent ones who practically forget feeding time, the cowards who tremble at the mere sound of his voice, and the desperate ones who treat every single paid minute as an audition to become his wife.

To Katsuki, finding someone to look after his son has become a mission that feels impossible to clear.

So, when Izuku Midoriya sits down across from him, Katsuki already has the words ready to drive him away before the guy can even open his mouth.

“Why the hell should I hire you?” Katsuki demands, slamming a folder onto the desk with a deafening thud. “Look at yourself. You’re too young. A strong gust of wind could knock you over. You lack experience, you lack everything.”

He narrows his eyes at Izuku, intentionally projecting an intimidating, oppressive aura. His gaze sweeps over the man, from his worn-out shoes up to his freckled face and round, emerald eyes. “How are you going to watch over my son when, by the looks of it, you’re the one who needs taking care of?”

Izuku doesn’t even blink. Instead, he calmly adjusts his posture and meets Katsuki’s scrutinizing gaze dead-on.

Right on cue, a sharp, ear-piercing wail pierces through the tension from the adjacent room.

The older man instantly bolts to the next room and scoops his son out of the crib. “Shh, stop crying. Papa’s here,” Katsuki whispers. The voice that usually roars across the battlefield is now uncharacteristically raspy and gentle. He pats the baby’s back, his large palms moving with deliberate care, terrified of hurting him.

“Please, Kota, just go to sleep. Do it for me, come on.”

But the baby only grips his t-shirt tighter, his sobbing continuous. It’s only then that Katsuki notices the younger man has followed him into the room. Katsuki’s defenses instantly snap back up; he clears his throat and tries to reclaim his fierce posture, even though he looks like he hasn’t slept in a week.

“What the hell are you staring at?” he snaps, though he keeps his voice to a whisper. “Get out.”

“Sir Bakugo, your patting rhythm is too fast. Your anxiety is only destabilizing him further,” Izuku says calmly. Before Katsuki can even reply, Izuku extends his hands. “Let me. Just for a moment.”

“Hey, Deku, don’t you dare try anything—”

Katsuki doesn’t even get to finish his complaint before Izuku carefully takes the child. The swiftness and gentleness of the younger’s movements seems natural. He presses the baby’s cheek against his chest, close to his heart, and begins to sway his body in a rhythm that looks almost like a dance. He murmurs a soft melody, a gentle caress to the ears. 

Within just a few seconds, the previously sobbing child quiets down, until he finally falls fast asleep.

Izuku slowly turns around. The shadow of a teasing smirk plays on his lips as he stares at a completely stunned, slack-jawed Katsuki.

“You need me here, Sir Bakugo, because I’m the only one who can look you dead in the eye without trembling,” the younger man whispers. His voice is quiet, but every single word feels like a slap to the pro hero’s pride. “And because I actually know how to soothe a baby better than a man who only knows how to yell and throw his weight around.”

Izuku takes a deep breath, his gaze growing even bolder.

“And my name is pronounced Izuku, not ‘Deku.’ Unless the Number One Hero struggles with reading a simple resume, too?”

Katsuki stares down at his own fist, which is trembling at his side. He is defeated. For the first time in two months, the world around him is finally quiet, and it is all thanks to the very person he intended to kick out just moments ago.

“Fuck,” Katsuki curses under his breath, just loud enough for himself, as he watches Izuku gently lay the baby down in the crib. “You’re hired. You start at six AM tomorrow. Don’t you dare be late. And... Izuku,”

The younger man pauses and turns around, raising a skeptical eyebrow as if waiting for the next explosion.

“Thanks,” Katsuki says quickly, before he can change his mind. He instantly averts his eyes, but Izuku catches the traitorous flush creeping up the tips of the number one hero’s ears.

Izuku’s adjustment into the household happens naturally. Within a few months, Katsuki’s once-chaotic penthouse gradually becomes... a home. The hero notices on the younger man’s resume that he dropped out of Support Engineering, despite clearly having a sharp mind for technical things. But the pro hero doesn’t ask. As long as Izuku takes good care of Kota and doesn't give him any headaches, he doesn’t care. Or, at least, that is what he forces himself to believe.

Because Izuku is a live-in babysitter, living under the same roof quickly becomes their routine. It is a massive help to Katsuki because, finally, he is no longer struggling alone as a single dad and the Number One Hero. Honestly, it reaches a point where he actually prefers coming straight home rather than working overtime at the agency. There is something pulling him back home, something he can’t quite put a name to.

One night, the pro hero comes home completely drenched from the rain. He is utterly exhausted, his shoulders feeling too heavy to even lift after a grueling, long mission. He expects to be greeted by noise and a mess, but when he steps inside, the living room is clean and most of the lights are off. Only the kitchen light is on.

He sees Izuku from behind, busy in front of the stove. Katsuki catches the familiar, sharp scent of spicy curry—his favorite.

“You’re late, Sir,” the younger man says without turning around. He has already memorized the heavy cadence of Katsuki's footsteps. “Go take a shower right away so you don’t catch a cold. There’s a towel in the bathroom already, and I’ve set out your change of clothes on the bed.”

“Don’t order me around, Deku,” the older man mutters in response. He has zero energy to bicker; there is nothing but pure exhaustion left in him.

Katsuki leans against the doorframe and just watches the younger man. At first, he thought Izuku was weak and would give up immediately under his attitude, but he was wrong. He realizes that the younger man is exactly what he needs to keep his life from turning into a disaster every single night.

“There’s tea on the table too, Sir. I added honey for your throat,” Izuku adds, turning to face him with a smile.

Katsuki doesn’t answer. He just stares at the younger man, feeling an inexplicable weight settling in his chest.

Later, when Izuku starts clearing up after they eat, the pro hero suddenly snatches the dishcloth right out of his hand.

“I’ve got this. Just go sit over there,” the pro hero commands.

“But Sir, this is my job—”

“I said I’ve got it, didn’t I? Hardheaded,” Katsuki snaps. But instead of scolding him, he lifts Izuku by the waist and sets him down on the kitchen counter, bringing them eye-to-eye.

Izuku freezes, his eyes widening in shock.

Katsuki grabs a glass of warm milk and places it right beside him. “Drink that. It feels like every time I look at you, you’re yawning. Don’t abuse your body, go to sleep early…”

The pro hero pauses, his thumb brushing lightly against the rim of the glass, dangerously close to Izuku’s fingers...otherwise, you might be the one to get sick, and that'll make things hard for me.”

Izuku remains quiet, the tip of his finger tracing the rim of the milk glass as he observes the sides of Dynamight that camera lenses and the public’s cheers can never reach. The angles that, for now, fate has lent to him alone.

Sometimes, he really can’t understand his boss’ moods. There are times when his voice sounds like a series of explosions, but then there are moments when he is as quiet as this. Just like the other day.

He came home carrying a small paper bag from the pharmacy. He aggressively tossed it in front of Izuku, who was busy cleaning up Kota’s toys.

“Here,” Katsuki said bluntly.

"What is this, Sir?" Izuku asked, looking at the bag in surprise.

“For your hands. They’re already red from all the cleaning and washing of the kid’s bottles,” Katsuki snapped, looking away, his jaw tightly clenched. “It’s good stuff. Use it before you go to sleep. I don’t want you handling my son with skin that feels like sandpaper.”

Izuku froze. When he checked the brand, it was the exact expensive hand cream he had mentioned just once before—the one he wanted to try but couldn’t bring himself to buy.

“Thanks, Kacchan,” he said softly. He intentionally dropped the  “Sir.” He tried using that nickname last week; though Katsuki cursed, he never actually told him to stop.

The pro hero halted in his tracks, his back turning to stone. He didn’t look back, but under the bright living room light, Izuku clearly saw a flush creeping from his neck all the way to the tips of his ears before he finally disappeared into his room.

Since then, the air inside the house seemed to shift. 

It is three in the morning when Izuku wakes up to a faint cry from the baby monitor. He gets out of bed immediately, the soles of his feet meeting the cold hardwood floor. But before he can even touch the nursery doorknob, someone beats him to it.

Inside the dark room, only the blue light from the humidifier gives shape to the surroundings. There, Izuku spots Katsuki’s silhouette.

He is wearing nothing but a tank top, the sweat on his shoulders glistening under the blue light. The air smells of nitroglycerin and milk. Katsuki holds his son with utmost care, his arms—the ones so used to shattering walls—turning into the softest cradle.

“Shh... shut up, brat. Go to sleep,” he whispers. Even though he forces his voice to sound rough, the tenderness in it is undeniable. He gently rocks the infant while pacing back and forth inside the small room.

The pro hero notices Izuku leaning against the doorframe. “Why are you awake? Go back to bed, I’ve got this.”

"You just finished a mission earlier, Kacchan. I’m supposed to be the one watching him," Izuku answers softly, stepping closer to take the baby.

The older man shifts away and pulls Kota closer into his embrace. The baby is already starting to stop crying, his tiny hands playing with Katsuki’s necklace. “I said I’ve got this. You’ve been lacking sleep these past few days. Go to sleep unless you want me to blow up your room.”

Izuku doesn’t leave. Instead, he stands right beside his boss. They are so close that he can feel the hero’s every breath. Together, they look down at the tiny human who is now fast asleep.

“He looks so small in your hands,” Izuku whispers, barely audible.

Katsuki looks down at his son, and for the first time, Izuku sees a smile on the pro hero’s lips that is full of both fear and love. “Yeah. Way too small. Sometimes I’m terrified that one wrong move from me might hurt him.”

“You won’t hurt him. Look,” Izuku says, gently brushing a finger against Kota’s tiny hand, which is tightly gripping Katsuki’s finger. Izuku’s skin, now soft from the hand cream, briefly brushes against Katsuki's rough hand. “He feels safe with you.”

The older man lets out a deep sigh, his tension seemingly melting away. He leans his heavy shoulder against Izuku’s, allowing himself to draw strength from the younger man's presence. “He better. Because as long as I’m breathing, I’m going to make sure he will never have a single reason to feel afraid.”

Katsuki closes his eyes, savoring this moment of quiet.

“Come on... don’t go back to your room. Just stay here next to us,” the older man commands, though the fierce edge is completely gone. “I don’t want to leave this brat... and I don’t want to be alone here, either.”

That night, Izuku doesn't return to his own room. He sleeps on the small sofa while Katsuki remains sitting on the floor beside him, his back resting against the crib. He watches over the two most important people in his world as the sun gradually begins to rise.

Days pass where their only interactions consist of exchanging coffee cups in the early morning and taking care of Kota. Katsuki grows accustomed to Izuku’s presence in every corner of his life, but as everything inside becomes familiar, justice on the outside grows increasingly elusive.

It has been two weeks since Katsuki last got a decent night’s sleep, and the culprit isn’t his son’s crying, but rather a shadow in the alleys whose every encounter ends in smoke. Literally.

The door opens. Katsuki doesn't even need to turn around; the air is instantly filled with the scent of chamomile and the familiar fragrance of the fabric softener Izuku uses on their clothes.

“Kacchan, it’s one in the morning. If you don't stop, you're going to end up blasting your own sidekicks tomorrow from sheer irritability,” Izuku jokes softly, setting down a tray of tea and sandwiches amidst the scattered files.

“Don’t start with me, Zu,” Katsuki snaps, rubbing his palms over his face. “This bastard is too slick. Slipping away right in front of me like a bursting bubble.

Izuku doesn’t answer. Instead, he steps up behind him. Katsuki feels the younger man’s breath over the top of his head which is a warm presence far more distracting than any caffeine. The younger man leans forward, his arm brushing dangerously close to Katsuki’s shoulder, to point at a graph on the edge of the CCTV feed.

“Did you notice this?” Izuku asks, his voice turning serious. “The target always stops right in front of the fire hydrants before he completely vanishes.”

“So what? Maybe the asshole is just tired from running,” the hero replies irritably, though his eyes are already following where Izuku is pointing.

“No, Sir. Look at the water pressure graph in the area whenever he’s there,” he explains calmly. He quickly blows up the data on the screen, his fingers dancing across the keyboard with incredible speed. “He isn’t teleporting, Kacchan. He’s using the water in the pipes to condense. He merges with the air, literally turning into mist.”

Katsuki freezes. The frustration in his chest is instantly replaced by rapid, cold calculation.

“If you shut off the main water valve for this sector,” Izuku continues, his eyes gleaming under the light of the monitor, “he’ll have no source of moisture left. He’ll be trapped in his human form, and he’ll have no choice but to face you physically.”

The air inside the office grows heavy.

Katsuki slowly spins his chair around. In one fluid motion, he grabs Izuku’s arm and pulls him close, forcing the younger man to stand right between his thighs. Their chests are nearly flushed against each other. Katsuki can feel the rapid thrum of the younger man’s heartbeat syncing up with his own exhausted pulse.

“Where the hell did you learn an analysis like that?” Katsuki asks, his voice raspy. His gaze is sharp, cutting through Izuku as if he is truly seeing the man standing in front of him for the very first time. “They don’t teach this shit in a babysitting seminar.”

A teasing smirk plays on Izuku’s lips. He doesn't pull away; instead, he leans even closer against Katsuki’s chair, openly challenging his authority.

“I’m educated, Sir. Changing diapers isn’t my only skill,” Izuku whispers. “So finish up here so you can head home early. Your son has a curfew. He let me know earlier through a very loud crying session that it’s your turn to change his diaper next,” he jokes playfully.

“Support Engineering, right?” The pro hero asks again. His hand creeps up around the younger man’s waist, his fingers lightly feeling the fabric of his shirt. “Why the hell are you wasting your time babysitting when you can dissect a villain’s quirk using nothing but a graph?”

Izuku meets his gaze without a shred of fear, his expression bold and playful. “Because kids are a lot easier to talk to than heroes who look down on me just because of my age and appearance.” For a brief second, Izuku's expression softens, replaced by a serious look as if there is something more he wants to say, but he holds himself back. “Besides... I need this, Kacchan. I need the money.”

Katsuki brings his face closer, burying it near the crook of the younger man’s neck. He doesn’t touch him, but he is close enough to inhale the scent of coffee and fresh laundry, a combination that jolts his senses wide awake.

“You talk too much,” he mutters hoarsely. Every word is a warm breath brushing directly against Izuku’s skin. “You really want me to shut that mouth of yours, don’t you?”

Katsuki thinks he finally has the younger man cornered, but Izuku swiftly breaks away. He flashes a sweet, triumphant grin before turning his back.

“Drink your tea, Kacchan. It’s getting cold... just like your leads were a few minutes ago.”

Izuku walks toward the door with absolute, unbothered confidence.

“Hey!” Katsuki barks out, but he remains glued to his seat, his fists clenched tight on top of the desk. His entire system is in absolute chaos from the sheer rush of emotions. “Get back here, Deku! I’m not done with you!”

Izuku merely offers a lazy wave of his hand before finally closing the door behind him.

Left behind in the quiet office, Katsuki is breathing heavily, his heart hammering against his ribs. He looks down at the cup of tea, which is still steaming.

“Fuck,” he mutters through gritted teeth. He rubs his own neck, as if the ghost of Izuku’s presence is still lingering right there on his skin.

Ever since that night in the server room, the image of Izuku washed in the blue glare of the monitors had been burned into the back of Katsuki’s eyelids. The way he dissected the villain’s quirk wasn’t just basic guesswork, it was high-level, intuitive analysis. The kid who sat on his living room floor singing nursery rhymes to Kota had a sharp intellect that left his senior sidekicks looking like total amateurs. It was a dangerous kind of brilliant, and Katsuki was becoming entirely too fixated on it. 

Katsuki just got back from a patrol in the pouring rain. The moment he collapses onto the sofa, he lets out a string of curses while aggressively hacking at his right gauntlet. It’s smoking, smelling faintly of burnt wiring, and seems completely jammed onto his arm.

“Piece of shit gear, always fucking overheating! I told the support department to fix the cooling vents!” Katsuki snarls in pure frustration.

Izuku walks over from the kitchen, carrying a small screwdriver and a glass of water.

“Kacchan, don’t force it. If you pull the lock while the sensors are still hot, the safety mechanism is only going to grip tighter,” Izuku says calmly. He doesn’t even wait for an answer. He kneels on the floor right between Katsuki’s thighs to get the right angle on his arm.

“Get away from here, Deku. It might blow up in your face.”

“It’s not going to blow up. The nitroglycerin residue in your internal valves is just too high,” Izuku replies, his voice steady.

“If you actually read the manual, you’d know this model wasn’t designed for back-to-back rapid-fire in heavy rain. You’ve got moisture build-up in the trigger pin.”

“What fucking manual? Who the hell is actually reading that thick-ass book?”

“I do, Sir. Because I’m the one who has to listen to you curse every time it breaks,” Izuku counters. He carefully takes hold of Katsuki’s arm. Using the tip of the screwdriver, he twists a tiny screw hidden just beneath Katsuki’s wrist.

Ssssst

The gauntlet releases a small hiss of steam, and the lock suddenly pops open.

“Simple, right?” Izuku smirks, gently sliding the heavy metal armor off Katsuki’s arm. “I already adjusted the tension spring, too. It won’t rattle around on you tomorrow.”

Katsuki stares at his reddened skin, then up at Izuku’s face, which is now seriously inspecting the inside of the gear.

“How the hell do you know more than the support department? I pay those bastards millions for my gear.”

“Because they only look at the blueprint. I look at how you actually use it,” Izuku answers bluntly, meeting Katsuki's eyes dead-on.

“Your recoil management is way too aggressive. If I don’t adjust this, it won’t be your gear that breaks before the month ends, it’ll be the bones in your arm.”

The pro hero’s jaw tightens. Izuku is entirely too close, his scent of tea mingling with Katsuki's own smell of sweat and gunpowder. The younger man’s words from that night in the office echo back to him: “I need this, Kacchan.”

“You really take your job seriously, huh?” Katsuki asks, his voice raw.

“Well, if you end up crippled, Sir, who’s going to carry Kota around?” Izuku fires back teasingly, standing up with the gear in hand. “Drink your water. I’ll just go grab some ointment for your burn.”

“Why the hell do you know so much about my gear anyway?” the pro hero asks a few moments later, as Izuku gently applies the medication to his forearm.

“Analyzing heroes used to be a hobby of mine, Kacchan. Especially yours. Your quirk is just... incredibly interesting,” Izuku answers, his fingers softly smoothing over the pro hero’s skin. His hands are exceptionally soft, a clear proof that he’s actually been using the hand cream Katsuki gave him.

“So you’re interested in me, huh?” Katsuki teases, even though his own pulse is racing from how close Izuku is.

“In your quirk, Sir. Your quirk,” he shoots back, deliberately pressing down a little harder on Katsuki’s burn to mess with him.

“Ow! Damn it, Nerd.”

“Language, Kacchan. There’s a baby in the house.”

Because of the brilliance Izuku displayed in dissecting both gear and quirks, Katsuki begins pushing the paperwork for an internship program at his agency. He knows it won’t be easy; he’ll have to argue with the board regarding the budget and logistics. But every time he catches sight of Izuku seriously reading through his old manuals, he knows every single signature and hour spent in the office is entirely worth it.

Today, it is finally Katsuki’s day off. He leans back against the sofa, watching some random show on TV that he doesn’t actually comprehend, because his entire attention is anchored to the weight of seven-month-old Kota fast asleep on his chest. The baby is healthy, his breathing long and steady, which something Katsuki gives thanks for every single night.

He feels Izuku gently approaching. The younger man carefully lifts the baby from his chest to transfer him to the crib. When he returns to the living room, he begins tidying up the scattered toys without a word.

Katsuki can’t take his eyes off him. Izuku is wearing his old UA gym shirt, a t-shirt that used to fit snugly across Katsuki’s broad, muscular frame, but now hangs like a large sack over Izuku’s lean shoulders.

He had only lent it to him because the younger man’s shirt got drenched in baby milk, but Katsuki wasn’t prepared for the effect. With every move the younger man makes, the loose neckline stubbornly slips down, exposing smooth, sun-kissed skin at his shoulder. More than that, the sharp scent of the detergent mixed with Katsuki’s own natural scent clinging to the fabric hits his system like a physical blow, seemingly claiming his every breath.

“I told you to borrow it, I didn’t tell you to wear it like that,” Katsuki snaps, his voice gravelly. He forces himself to look in another direction, but every single fiber of his being remains entirely focused on the younger man. He fights the rapid, violent hammering of his heart, which feels ready to burst from his chest.

“It’s just way too big, Sir,” Izuku defends himself. He pouts slightly, trying to tug the neckline back up to cover his shoulder.

He has no idea that with every tug, the thin fabric only clings more securely to his frame, making it significantly harder for Katsuki to maintain whatever remains of his sanity.

The older man stops thinking. He stands up, and before Izuku can even utter a word, the younger man feels Katsuki’s heavy presence right behind him. Katsuki buries his face into the crook of Izuku’s neck, breathing in deeply, as if he is finally getting enough air after a long, desperate drought.

“Kacchan? Are you okay?” Izuku asks nervously. He can feel his boss’ heat, but he can’t bring himself to step away. It feels as though his own body refuses to break free from that presence.

“Shut up. Just let me stay here... just for a second,” Katsuki whispers. His voice is raspy, almost pleading. He tightens his arms around the younger man’s waist, surrendering all his strength against the very fabric that belongs to him.

“You smell so good. Why do you smell like home? Why do you smell like me?” Katsuki buries his face even deeper into Izuku’s neck, savoring the younger man’s scent. “Zu, please... I don’t even know what’s happening to me anymore.”

The pro hero keeps his face buried against Izuku’s neck. The younger man can feel every heavy breath Katsuki takes puffing directly against his skin.

“Kacchan, you’re really making this hard for me, you know…” Izuku begins softly, his fingers shifting restlessly against the older man’s arms. “To be honest, ever since I was a kid... you’ve always been the one I looked up to. You’re the reason I went crazy over engineering. I wanted to be good enough to keep up with your pace. But... who would have thought I’d get to work this closely with you?"

Instead of answering, Katsuki lifts Izuku and carries him toward the sofa without breaking their contact for even a second. He sits down and pulls Izuku right onto his lap, leaving the younger man straddling him. In this position, there is nowhere for the younger man’s eyes to hide from the hero’s intense gaze.

“I really like playing house with you... with Kota,” Izuku whispers, his voice trembling somewhere between nerves and honesty. “I really like you, Kacchan. So much. Are you going to kick me out now that you know?”

Katsuki stares at him for a long, quiet moment. All the fierce aggression vanishes from his eyes, replaced by a profound gentleness that seems entirely reserved for Izuku alone. A teasing smirk slowly plays on his lips.

“Hm. I’ll give you a promotion instead,” Katsuki teases, his voice turning husky and deep. “As Dynamight’s controversial young lover. How’s that sound?”

Izuku lets out a soft laugh, a mixture of immense relief and happiness washing over his face. Katsuki places a hand behind the nape Izuku’s neck, drawing his face close until their foreheads are gently resting against each other.

“Don’t go thinking stupid things. I can provide for you, no matter how expensive your nerd hobbies are,” Katsuki whispers, his breath warm against Izuku’s lips. “Just stay here with us. Stay right here with me.”

In the midst of the quiet, the rest of the world seems to completely vanish around them. Their faces slowly draw closer until their lips finally meet. It starts with soft, tentative brushes. Then, the kiss deepens, turning fierce and heavy with desire. Like animals newly released from a cage, their tongues battle for dominance, drowning in the taste of one another.

The older man’s hands slide down from Izuku’s face to his slender waist. With one swift tug, he maneuvers the younger man’s body hard against his solid chest, refusing to leave even a millimeter of space between them as they continue to devour each other.

“Ngh...” Izuku groans, trying to pull back just enough to catch some air. His vision is already blurring, his entire system trembling under the sheer intensity of the sensation.

“You kiss dirty, baby. Not your first time, huh? Where did you learn that?” Katsuki asks, his voice raspy and dangerous, dripping with a sense of ownership so absolute it feels like he wants to mark every single inch of Izuku’s body.

“Huh? Y-you’re the first... you’re the only one who has ever held me like this, Kacchan,” the younger man stammers, completely breathless.

“Really? You saved this mouth just for me?”

Izuku nods, his eyes filled with pure supplication. He reaches for Katsuki’s lips again, but the older man playfully averts his face, disciplining the younger man through denial.

“Just a kiss and you’re already acting like this? You like being fucked with your mouth, baby?” Katsuki smirks, a dark expression crossing his features as he watches Izuku’s desperation.

Izuku nods rapidly, completely discarding his modesty. He tries to lean in again, but the pro hero pulls away once more. The younger man pouts, clear frustration and intense longing evident at his boyfriend’s teasing.

“Kacchan, please... I want more. Kiss me?” he begs, his tone a mix of pure innocence and heavy desire. He inches closer and softly licks Katsuki’s bottom lip, looking exactly like a puppy begging for his master’s attention.

The older man can no longer hold back; his nerd is simply too alluring to resist any longer. The next kiss becomes even more ravenous. Katsuki presses Izuku down against his thigh, enough for the younger man to feel the pro hero’s hardening cock pressing through the fabric of his pants.

“Ah!” Izuku gasps, his back arching the moment he feels Katsuki’s large palms slide down toward his ass. The older man squeezes him without a shred of restraint, gripping every inch of soft flesh with a fierce intensity, as if he wants to leave bruises on his cheeks as a mark of absolute ownership.

“Can I suck your tongue, Kacchan?” Izuku asks hoarsely, his eyes half-lidded from pure arousal.

Katsuki doesn’t bother answering; instead, he parts his lips slightly and coaxes his tongue out. Izuku lunges for it immediately. The only sound breaking the silence of the quiet living room is the filthy, wet sound of the younger man sucking on his boyfriend’s tongue, every whimper and small moan from Izuku drowning in the frantic exchange of spit. He drinks in every bit of roughness and heat, acting as if he wants to consume every drop of Katsuki's saliva.

While their mouths are occupied, Katsuki’s hand slowly creeps inside the hem of Izuku’s loose shorts. He roughly shoves the fabric aside until his warm palm meets the thin, completely drenched cotton of his boyfriend’s underwear. Right there, Katsuki freezes, his eyes darkening to a dangerous pitch as he registers the distinct heat radiating against his fingers.

“Hah... fuck,” Katsuki curses, his voice trembling with dark desire as he forcefully pulls his face away from Izuku’s to look him dead in the eye. “You have a pussy, baby? No wonder you’re so fucking wet, you little slut.”

He begins to rub right over the wet fabric of the slit, grinding his fingers against every sensitive spot. He can feel it throbbing violently against his palm.

“You’re already soaking wet, your pussy juices are dripping all over my hand right here,” Katsuki taunts shamelessly, watching every single shiver racking Izuku’s body. “Is this how you like to be played with? Just a rub from my fingers and you’re already opening up for me? Fuck, Izuku... you hid this from Kacchan just so you could play with it all by yourself, huh?”

Katsuki spreads the younger man’s legs even wider. “You want to get fingered? You want Kacchan to finger this little cunt for you?”

Izuku nods frantically over and over again, his vision blurring from the overwhelming pleasure and desire. He takes hold of Katsuki’s wrist himself, desperately guiding the older man’s hand right between his thighs. “Ah, nghh—hah. Kacchan, please... put your fingers inside, please. It itches so bad inside.”

But instead of moving the fabric out of the way, Katsuki chooses to be cruel. He presses the tip of his finger firmly against the very center of Izuku’s entrance, but keeps the underwear right between them. Because of the sheer force of his push, the damp fabric stretches and contours perfectly around the shape of Katsuki’s finger, forcing its way inward without actually penetrating the skin.

“O-oh my god!” Izuku gasps, his hips automatically lifting to chase the heavy pressure.

He can feel the hard tip of Katsuki’s finger perfectly, obscured only by the thin layer of fabric. The friction is doubled by the rough texture of the cotton forcing its way against his entrance. Every twist and heavy press from his boyfriend sends a wave of ache and pleasure through him that threatens to blind him completely.

“Shit, it won’t go in... too tight, isn’t it?” Katsuki curses, watching how the tip of his finger indents the center of Izuku’s soaking wet slit. “Look at you, baby. I’m pushing hard, but it refuses to open up. You really love it when Kacchan makes you suffer, don’t you?”

“A-ah! Ngh, Kacchan! P-push deeper... keep going,” the younger man begs, his hands gripping Katsuki’s arm tightly, trying to force the older man’s finger even deeper inside.

Katsuki bears down with even more pressure, forcing his finger as deep as the fabric will allow. The wet friction of the cloth grinding against Izuku’s flesh turns Katsuki’s vision dark with lust.

“You’re so filthy... these panties are completely drenched, but you still want me to bury myself in here?” Katsuki snaps, before grinding his finger in a tight circle again, ravishing his boyfriend’s sensitive spot hidden just behind the wet barrier.

Katsuki isn’t satisfied with only torturing him from the front. While keeping his finger pressed firmly against Izuku’s entrance, his other hand creeps around back, reaching for the waistband of the younger man’s wet underwear.

With one violent tug, he yanks the panties up from behind. Because of the sheer force of the pull, the fabric riding up the center of Izuku’s pussy turns into a thin, tight cord burying itself deep into his slit. The highly taut fabric snaps precisely against his swollen clit.

“A-ah! H-hah! Kacchan!” Izuku screams out, his body arching violently upward while his toes automatically curl at the intense jolt of electricity surging straight through him.

“What’s wrong, Deku? Does it feel good having the fabric stretched so tight right down the middle of your cunt?” Katsuki whispers hoarsely into Izuku’s ear. He doesn’t let go of his grip; instead, he begins to pull the fabric back and forth, rubbing it directly over the younger man’s most sensitive spot.

“Ngh—f-fuck! K-Kacchan, more…  Please, keep going!” The younger man begs, spit trailing from the corner of his lips as his vision completely darkens. Every rub of the rough, wet fabric burns away whatever sanity he has left.

“Fuck, look at how you’re shaking,” Katsuki grunts, pulling the panties even tighter until they are buried completely down his center. “You really love being played with like this, don’t you? Tell me, baby... how does this cloth feel against your pussy?”

“G-good... ngh, it h-hurts so good, Kacchan! Please, don't stop!”

Katsuki accelerates the pulling and friction of the cloth, fueled by Izuku’s every reaction. The wet sound of the fabric grinding against his flesh mingles with the younger man’s deep groans, until the only thing Izuku can register is the intense heat radiating between his thighs, feeling as though he is going to explode at any moment.

Under the sheer weight of the torture Katsuki is inflicting with the tightly stretched fabric, the tension in Izuku’s body reaches its absolute peak. Every rub against his clit feels like pure electricity exploding directly in his brain, completely stealing away every shred of sanity he has left.

“K-Kacchan! Wait—ngh! Cum... h-hah... f-fuck!” Izuku’s entire body is shaking violently. His legs desperately try to lock around Katsuki’s waist, while his fingers dig deep into the hero’s muscular arms, leaving white pressure marks against his skin.

But Katsuki doesn't stop. He pulls even harder on the waistband of Izuku’s panties, forcing the thin line of fabric deep into the younger man’s most sensitive spot as he pulls it back and forth rapidly, violently, and without mercy.

“You’re going to cum already? Fuck, I haven’t even done anything yet and you're already giving up?” Katsuki snaps, his voice dripping with dangerous taunts. “Go on, cum, baby. Show me how much of a little slut you are while I play with you.”

“Ah—AH! NGHH!”

Izuku’s eyes completely roll back. His body turns as rigid as iron before a violent tremor racks his entire frame. A silent scream escapes him, his mouth hanging open as he desperately tries to catch his breath. But instead of any release pouring out of him, the entire sensation remains trapped deep in his core and between his thighs.

His body spasms, every muscle giving out, while his inside throb and tighten repeatedly around the heavy pressure Katsuki is applying.

“Hah... hah... K-Kacchan…” Izuku sobs, his vision blurring with tears as his body gradually collapses against Katsuki’s chest. Even though the wave has passed, he can still feel the intense electric currents refusing to let him go.

The older man presses his finger hard against the soaking wet fabric covering Izuku’s entrance, savoring every last tremor of his boyfriend's flesh. “That’s just the dry run, baby. We haven’t even gotten to the real game yet.”

Without a moment’s hesitation, Katsuki makes the younger man stand up. “Strip, baby. Right now,” he orders, his voice dead serious, leaving absolutely no room for protest.

Even though his legs are trembling and he almost loses his balance from the lingering exhaustion of the orgasm, Izuku obeys. He slowly pushes down the wet shorts and the panties Katsuki used to torture him just moments ago. When he makes a move to pull off the old UA shirt as well, Katsuki’s large palms quickly stop him.

“Keep that on, Zu,” Katsuki whispers, before forcefully spinning Izuku around. Now, the younger man is facing the living room TV while feeling the scorching presence of the pro hero right behind him.

“Bend over,” Katsuki orders again, his hand gripping Izuku’s hip firmly. “Spread these thighs for me... show me how badly this leaking pussy of yours is drooling.”

Izuku slowly complies. He braces his hands on the coffee table, pushing his ass up and out. “L-like this?” he asks breathlessly, trying to look back over his shoulder to catch Katsuki’s reaction.

Because of Izuku’s position, his center is perfectly aligned with Katsuki’s face, who is sitting slightly lower. The hero leans in, using his thumbs to roughly pry apart the flushed, swollen lips of Izuku’s slit. The pink flesh is fully visible, throbbing with every heartbeat, while his entrance twitches expectantly, begging and starving to be filled.

“Kacchan? What are—nghhh! Ahh! Ahh!” Izuku’s back suddenly arches violently as he feels Katsuki’s warm, rough tongue lap directly against his slit.

“Fuck... this pussy of yours is so pretty,” Katsuki curses between licks. “Shit, you taste so good.”

“Mhm... it’s all yours... please, lick me... suck it, Kacchan,” Izuku begs, his fingers digging into the edge of the coffee table.

Before continuing his assault, Katsuki pauses for a brief second. He pools a thick amount of saliva in his mouth and, without any warning, spits directly over Izuku’s entrance. Katsuki watches with dark arousal as the younger man’s pussy slowly drinks down his spit.

“Look at this hole of yours, it won’t even let my spit go to waste,” Katsuki rasps, before driving his tongue back down, burying it inside the entrance to mix his spit with the younger man’s juices.

“It feels so good... more, Kacchan... lick deeper inside me, please!”

Katsuki laps at him with even more ferocious intensity, the wet sound of his tongue against the raw flesh deafening in the quiet living room. With every heavy suck Katsuki takes from Izuku’s slit, the younger man loses another shred of his sanity, drowning completely in the sensation of being thoroughly consumed by the hero.

While his tongue roughly licks and sucks inside Izuku’s entrance, feeling every single pulse of the sensitive flesh, he uses his rough thumb to rub the younger man’s swollen clit with fast, heavy pressure.

“H-hah—AH! K-Kacchan! Wait—stop! Ahhh! It's too much!”

Izuku screams out, his eyes rolling back as his tongue hangs slightly out of his mouth while he desperately tries to catch his breath. The air in the living room turns thick, heavy with the scent of pure lust, and Izuku’s sweet juices are already flooding the space between their thighs.

Every rub Katsuki inflicts on his clit feels like electricity exploding straight into his lower abdomen. It is far too sensitive, almost painful, but the older man refuses to let him escape. Izuku can feel the scorching heat radiating from Katsuki’s skin. The hero only grows more feral with every tremor racking the younger man’s thighs, forcefully spreading him wider to obscenely witness every single twitch of his flesh under the living room light.

“What do you mean, enough? Fuck, look at how your juices are flooding all over my face,” Katsuki rasps, his voice dropping into a deep, gravelly baritone that sounds like it’s being dragged from the pits of his chest.

While one hand continues to torture Izuku’s center, his other hand aggressively dives straight into his own pants. Katsuki frees his hard cock, which feels ready to burst from the overwhelming heat. Right there, directly behind the younger, he begins to jack himself off in a fast, filthy rhythm.

The living room fills with the sound of their depravity. The wet splat of his pre-cum slapping against his own skin, the slick sound of his tongue vacuuming Izuku’s pussy, and the heavy rattling of the coffee table as the trembling boy claws at it for dear life.

“I wish you could see this, Deku... I’m watching your pussy twitch while I stroke my dick just for you,” Katsuki whispers, before digging his thumb right back into Izuku’s clit, rubbing as if he wants to tear it apart from the pleasure.

“Are you really this much of a slut, huh? You love getting ruined by a man who’s old enough to be your damn father,” Katsuki murmurs, his lips nearly brushing against Izuku’s shaking thigh. “You should be respecting me because of my age, because I have a kid... but here you are, bent over and letting me use you like you have absolutely no morals.”

“A-ah! F-fuck! AH! AH!”

Izuku’s groans break entirely, barely any voice escaping him from the sheer weight of the sensation. His brain has completely short-circuited; the raw, musky scent of sex mingles with every frantic breath they take.

Katsuki accelerates his strokes even more while his other hand ruthlessly tortures Izuku’s center. “Tell me, Izuku... who’s making you cry right now? Which older man is corrupting your mind?”

“D-Daddy... ngh... I-it’s Daddy Katsuki...” Izuku sobs, his vision darkening completely. His thighs spasm violently, completely at a loss for how to handle Katsuki’s relentless hunger. “I-it only belongs to you…”

“It still itches so bad inside... more please?” Izuku begs, his voice broken and filled with a desperate, innocent longing.

The older man doesn’t hesitate. He presses his four fingers tightly together and drives them inside, ruthlessly stretching open his boyfriend’s begging entrance.

“Fuck! Yes! Yes! It feels so good, hnghhh!” Izuku moans loudly, his tight walls gripping hard around Katsuki’s fingers.

With every ruthless assault, Izuku’s juices splatter onto the carpet and across the hero’s own arms. The filthy, squelching sound echoes loudly throughout the living room.

“You hear that, baby? Do you hear how your pussy is devouring my fingers?” Katsuki rasps, his voice sounding as though it’s being dragged from the deep.

“Hmnnn—! D-Daddy! Right there! Oh god, that feels so good… please…” Izuku moans loudly as Katsuki strikes his sweet spot. “Don’t stop... don’t stop—haaah!”

Suddenly, Katsuki yanks his fingers out, the exit sounding like a sharp release of suction. Before Izuku can even catch his breath, the hero swiftly raises his palm and slaps the younger man’s soaking wet slit with all his might.

SMACK!

“Ah! Kacchan!” Izuku thrusts his hips back, his spine arching as pain and pleasure slice through his lower abdomen at the exact same time.

“Look at you... Feels good, huh?” Katsuki slaps Izuku’s flushed pussy once more. The sheer force of the skin-on-skin impact sends a jolt through every single one of the younger man’s nerves like live electricity.

“Fuck! Ahnnngh... it feels so good! Daddy, s-spank me again... please!”

Izuku takes hit after hit until his center is completely swollen. He no longer has the strength to resist; his thighs simply fall open on their own as he sobs, his skin glistening with sweat and Katsuki’s saliva.

“That’s it…” the older man whispers, rubbing the swollen slit with his rough palm. “That’s it, baby. Good boy.”

Sensing the violent throbbing deep inside Izuku, the pro hero buries his fingers deep inside once more. At the same time, Katsuki’s other hand accelerates its frantic pace against his own length.

“Aah… ‘m gonna cum… please, please! Ah, ah…”

“I know, baby. You can cum anytime you want,” Katsuki grunts, ruthlessly thrusting his fingers until they hit the absolute furthest depths of Izuku’s inside.

"K-Kacchan! Shit—wait! Something's wrong... s-something feels weird inside! Ahh! Wait, I think I’m gonna pee! Just w-wait, please!”

Instead of stopping, Katsuki drives his fingers in even faster, deliberately punishing the younger man’s bladder. A desperate shriek of pure ecstasy tears from the younger man as he claws tightly onto Katsuki’s wrist.

“A-ahhh please oh, god, ahnggh—!”

Izuku’s hips won’t stop shaking as a hot, thick torrent suddenly gushes out of him, spraying directly across Katsuki’s chest and face. He weeps from the sheer shame of it, watching his own fluids flood onto the floor.

Katsuki freezes for a fraction of a second, his eyes widening before darkening with absolute, feral desire. “Oh, fuck,” he groans. He leans down and slowly licks and drinks the fluid from between Izuku’s thighs. At that exact moment, Katsuki’s own load completely erupts in his hand.

“That was so sexy, baby. You’re driving me fucking insane.”

Izuku’s knees give out entirely. He collapses straight onto the floor, his frame still wracked by the intense, violent tremors of his climax. He quickly slaps his hands over his face, desperately trying to hide his tear-soaked eyes and a face that is burning crimson from the sheer weight of his humiliation.

He can feel the heat of the fluid pooled beneath him, and in Izuku’s mind, he can't think of anything else except how filthy he must look in front of his boyfriend. He feels exactly like a guilty child who just wants to vanish into thin air.

“Izuku?” A deep, raspy baritone breaks through his sobbing. Katsuki kneels right between Izuku’s trembling thighs. He isn't angry; instead, he gently coaxes the younger man’s palms away from his face. “Look at me, baby. Why are you crying?”

“K-Kacchan… sorry… I’m so sorry,” Izuku weeps, his voice thin and broken. He desperately tries to press his legs together to hide the wet puddle on the floor, but Katsuki quickly clamps a hand down on his thigh to stop him. “I-I peed… I made a mess right in front of you… it’s so humiliating.”

Every single word out of the younger man’s mouth is laced with deep mortification, looking thoroughly disgusted by his own body’s reaction. A low, amused chuckle rumbles from Katsuki’s throat, but this time, the sound is dripping with pure tenderness. He leans in close, resting his forehead against the trembling boy’s.

“Oh, baby,” the older man whispers, brushing away the tears on his boyfriend’s cheeks with his rough thumbs. “You didn’t pee. You just came so hard because I’m driving you completely insane with pleasure.”

Katsuki presses a soft kiss to the tip of Izuku’s nose before moving down to brush against his shaking lips. “It’s called squirting, baby. It just means Kacchan is so damn good at making you feel amazing that your pussy gushed like that.”

“B-but… there was so much of it… it’s embarrassing,” Izuku whispers, burying his flushed face directly into Katsuki’s chest.

“What the hell is embarrassing about that? Fuck, that was the sexiest damn thing I’ve ever seen in my entire life,” the older man murmurs, rubbing Izuku’s back in slow, soothing circles. A stroke meant to comfort, yet still laced with lingering desire. “You completely emptied yourself out for me, didn’t you? My good boy...”

Katsuki kisses the shell of Izuku’s ear, playfully nipping at the lobe. “Don’t worry about it, I’ll clean this up. But next time, I want all those juices spraying straight into my mouth, you understand me?”

“K-Kacchan!” the younger man snaps his head up, utterly shocked by his boyfriend’s filthy yet incredibly sweet declaration.

After that day, Katsuki makes the "training" of the younger man’s pussy a daily ritual. Every single time before his patrol shift, he is either eating his boyfriend’s cunt or grinding the head of his cock against his slit until they both get off.

One afternoon, while Katsuki is rushing to prepare for his night shift, he can’t resist the sight of Izuku wearing nothing but a loose t-shirt while brewing coffee. He hoists the younger man up immediately and sets him down on the kitchen counter, forcing his trembling thighs wide open before stripping away his shorts and panties.

“Kacchan... you have to leave soon, right? You might be late for patrol,” Izuku protests weakly, though his center naturally parts for his boyfriend on its own.

“I’m not leaving until I get a taste of how fucking desperate you are for me today,” Katsuki growls. Without a shred of warning, he pulls down his zipper and frees his raging cock. He doesn’t drive it inside just yet; instead, he roughly grinds the hot, leaking head of his shaft right against Izuku’s clit.

“D-daddy! I-it feels so good... ngh!” Izuku clings to Katsuki’s shoulders, his spine arching as he feels every single vein of Katsuki's cock stroking his slit.

“Look at this, Izuku... you’re already so sticky.” Katsuki whispers, accelerating the friction, deliberately driving his weight into every corner of his boyfriend's wet flesh. The slick, wet sound of their mixing juices echoes throughout the kitchen.

“Daddy... p-please, put it in... I-I can’t take it anymore…” Izuku begs, his eyes already rolling back from the sheer torture of being edged.

“Not yet, baby. Look at this hole of yours, it’s so small and tight... like it’s barely been touched.” Katsuki smirks. He clamps his hand firmly around Izuku’s jaw, forcing him to look down between them. “Look at how my dick is making a mess of your pussy. Look at how you’re twitching from nothing more than an older man rubbing against you.”

With one final, heavy friction stroke, they moan loudly together. A shriek escapes Izuku, shaking from the pleasure, while the pro hero releases hot semen right over the younger man’s lower abdomen.

The Izuku pants heavily, his eyes still half-lidded from the euphoria, but the phrase “finished” simply doesn’t exist in Katsuki’s vocabulary.

The pro hero pulls the younger man down from the counter and roughly bends him over from behind. While Izuku’s entire frame is still trembling from the residual pleasure and his juices trail down his thighs, Katsuki suddenly thrusts four fingers straight into his hungry entrance.

“A-AHHHH! K-Kacchan! It’s too m-much—!”

“Take it, baby. Shit, this pussy of yours is swallowing my fingers so fast now,” Katsuki curses hoarsely.

The slick, filthy sound fills the kitchen as the younger man’s soaking wet opening devours his boyfriend’s four fingers. The pro hero ruthlessly drives them in and spreads them wide inside. Izuku can feel every knuckle and vein of Katsuki’s fingers raking through his flesh, while the outside of his entrance gradually flushes red, stretching wide to accommodate the sheer size of what’s inside him.

The musky scent of their fluids intensifies, mingling with the sharp aroma of Katsuki’s sweat. Every wet pop of his fingers plunging in and out sounds like absolute music to the ravenous pro hero.

“See how perfect you open up when you know you belong to me?” Katsuki whispers, deliberately stretching his fingers apart inside to widen Izuku’s delicate flesh even more. “You’re stretching so soft for me, baby... I could shove my whole hand in here next time, couldn’t I? Think about how it’s gonna feel…this fist packed so deep inside your core, fucking you until you lose your mind.. Do you want to see my knuckles bulging against your stomach while I treat you like my favorite little slut?”

“Y-yes... hngh! I-I want it... r-ruin me, Daddy... ahh!” Izuku sobs, his ass instinctively backing up to swallow his boyfriend’s fingers even deeper.

Suddenly, Katsuki stops the violent thrusting of his four fingers. He keeps them completely still inside. Izuku moans in agonizing frustration, his body agonizing over the sudden half-done sensation. His twitching pussy seems to have a mind of its own, milking his boyfriend's fingers, desperately begging for movement, for pain, for pleasure.

“Kacchan?... p-please... move them…” Izuku sobs, his nails digging into the edge of the counter.

“You’re the one who wanted this, right? Go on then... show me just how desperate you are to get fucked,” Katsuki whispers, his voice dripping with pure malice. “Do it yourself, baby. Use my fingers to scratch your own filthy itch.”

Driven by overwhelming need, the younger man has no choice but to surrender to his lust. Slowly, he begins to roll and shift his own hips.

With every backward push of his backside, a slick, filthy sound echoes as he deliberately buries Katsuki’s fingers all the way inside himself. The younger man closes his eyes, his lips parted as he pants, savoring every bit of friction between his sensitive walls and his Kacchan’s hard fingers.

“Fuck... look at you,” Katsuki rasps, watching his boyfriend willingly turn himself into a total whore on his hand. “Such a good little slut... you’re literally fucking yourself using my fingers. You’re such a dirty boy, Izuku.”

Izuku accelerates the movement of his waist even more. The loud, wet slapping sound of his thighs hitting Katsuki’s hand rings through the kitchen. Every single thrust he makes is deliberately aimed to grind directly against his sweet spot, until his moans turn into a rapid, incoherent string of whimpers.

“Y-yes... D-Daddy... hngh! It feels so good…”

Sensing that the younger man is about to break under his own momentum, Katsuki suddenly yanks his four fingers completely out of the entrance.

“N-No... Kacchan, why—” The younger man’s complaint is cut short as Katsuki handles him roughly, throwing him flat on his back onto the counter before violently grabbing his legs and pinning them wide open.

Izuku’s thighs feel as though they are going to tear from how severely his legs are stretched back against the sides of Katsuki’s frame. His angry, pulsing center is completely exposed. His pussy is swollen, flushed, and twitching against the cool air and the burning heat of desire.

“You’re getting way too restless. You need to learn some fucking restraint,” Katsuki snaps hoarsely.

Without a single word of warning, Katsuki lifts his broad palm and delivers a heavy, echoing slap directly against Izuku’s soaking wet pussy.

SLAP!

A sharp, wet slapping sound of skin against skin fills the kitchen. Izuku shrieks, his entire body arching violently from the sheer shock and overwhelming pleasure. His sensitive slit flushes a bright red instantly, his clit throbbing against the sudden, sharp sting that immediately morphs into a maddening, deep itch.

“A-AHHH! H-hngh... it hurts... but it f-feels so good… It feels so good!” Izuku sobs, his eyes already blurring heavily with tears.

“I know, baby,” Katsuki smirks, before unleashing another, even harder and more ruthless strike.

SLAP!

This time, the sheer force of the impact sends Izuku’s juices splattering directly onto Katsuki’s hand and across his chest. The sound turns even filthier due to how thoroughly slick his pussy is. Every slap the older man inflicts is deliberately aimed at Izuku’s swollen flesh, as if he intends to brand the exact shape of his palm onto the younger man’s most sensitive spot.

“Fuck, Izuku... the sound your pussy makes while I’m spanking it is so fucking hot,” Katsuki grunts, continuing to turn his boyfriend's center a deep scarlet. “That’s it... beg for it. Cry it out while your Kacchan disciplines you.”

“P-please... D-Daddy... s-spank me more…”

SLAP!

Along with that final, ruthless strike, Katsuki seizes both of Izuku’s thighs and roughly hauls them straight against his body. He leans down and traps Izuku’s lips in a ravenous, desperate kiss. It is pure, unfiltered consumption, as if Katsuki intends to suck out every last breath remaining inside him.

When their lips finally part, trailing a long, thick string of saliva between them, the pro hero sinks down between his boyfriend’s trembling thighs. Using both of his thumbs, Katsuki firmly spreads the lips of the younger man’s pussy wide open.

The wet, sticky sound of the flesh separating echoes clearly in the quiet kitchen, fully exposing Izuku’s raw, swollen inside. Katsuki deliberately digs his finger hard into his clit.

Right then and there, Izuku’s mind completely short-circuits. A long, desperate shriek tears from his throat as his frame arches violently, his toes curling tightly at the sheer jolt of electricity surging straight up his thighs.

“A-AHHHHH! DADDY! IT FEELS SO GOOD! HNGH—!”

Katsuki doesn’t break his gaze for a single second. Staring with feral intensity at Izuku’s ruined, gaping opening, an incredibly powerful, hot jets of fluid suddenly gushes out from him. The clear, thick liquid sprays directly into the pro hero’s open mouth.

He catches every single hot drop of the younger man’s juices right in his mouth, drinking in the sweet taste of his boyfriend’s pure arousal. Not content with just that, he buries his face directly into the younger man’s still-twitching pussy, aggressively lapping at every fold of flesh that continues to weep fluid.

“Mmm... fuck, Izuku. You taste like such a delicious little slut,” Katsuki groans, his entire face and nose soaked and glistening with his boyfriend’s slick. “Taste this... taste exactly how dirty you are for Kacchan.”

He rises instantly, his eyes burning with absolute lust, and hooks a hand around Izuku’s jaw to force him to face him. He delivers a heavy, brutal kiss. He forces the younger man’s mouth open and empties all the fluid he just caught right down his throat, forcing Izuku to swallow his own wetness.

Completely out of breath, Katsuki finally pulls away from his boyfriend, while the residual fluid continues to drip onto the floor beneath them.

“Shit. So good, baby.”

A few days later, it is finally Katsuki’s day off, and this is the day he has fully intended to take Izuku completely. They left Kota with the pro hero’s parents since they were dying to see their grandson again. An opportunity the pro hero wasn’t about to pass up to finally claim his boyfriend without a single interruption.

Katsuki brings Izuku into their bedroom, where the only illumination is the warm, golden glow radiating from the bedside lamp. There, Katsuki slowly undresses the younger man until he is completely bare. Under the dim light, Izuku’s sun-kissed skin is fully visible, flushing red from a mix of modesty and intense arousal, his small nipples hardening against the chill of the air conditioning, and his slit already weeping.

Katsuki leans down, not to kiss him, but to bite down hard on Izuku’s neck while his hand ruthlessly torments the younger man’s swollen clit.

“Hngh!...” the younger man groans, his nails sinking into Katsuki’s solid shoulders.

Suddenly, Katsuki stands up at the foot of the bed and strips off his sweatpants. His cock springs free, a thick bead of pre-cum already leaking from the tip.

“Look at this, baby. Look how fucking desperate my dick is to completely wreck this pretty little body,” Katsuki murmurs, deliberately smearing the thick pre-cum from his hot shaft across his boyfriend’s lips. “Taste your reward first. Let me see how hungry you are to swallow every single inch of what’s coming to you.”

Without a shred of hesitation, Izuku licks up the leaking fluid, his eyes rolling back as he drinks in his boyfriend’s salty, musky taste. But before he can even suck on it properly, Katsuki seizes his legs and hauls them up until Izuku’s body is completely folded back.

“Kacchan... p-please... put it inside... I-I can’t take it anymore…” Izuku sobs, his twitching opening pulsing open and closed, practically breathing from the weight of his need.

“You want to feel this inside you? Huh?” Katsuki asks, aggressively rubbing his cock up and down against Izuku’s soaking wet slit. “Cry for it, baby. I want to watch you turn into a total mess before I finally bury myself in you.”

“P-please! P-put it in! D-Daddy..” Izuku hyperventilates, his voice cracking into a high-pitched, pathetic whine. He desperately arches his back, bucking his hips upward in a frantic, uncoordinated attempt to force the thick shaft inside himself. “Daddy, please, I’ll be so good, I’m your good boy, just f-fuck me... please don't leave me empty, I-I need it, put it in–”

In a single, violent motion, Katsuki buries his entire length inside him.

“D-DADDY!”

Izuku shrieks, his entire frame shuddering as he registers the brutal tearing and stretching sensation deep inside his walls. He can barely even draw air; it feels as though his entire being has been split completely in two by the sheer size of Katsuki’s shaft.

The older man pauses for a brief moment, letting his entire length remain buried to the very absolute depths of Izuku’s inside before slowly twisting his hips, savoring every single twitch of the younger man’s internal walls. “Is it too big for my littke baby? Hm? Look at you, your pussy can barely even close around the size of your Kacchan.”

“A-ah! D-Daddy… hngh… it’s s-so incredibly full…” Izuku sobs, his hands trembling as he cups Katsuki’s cheeks, desperately begging for a kiss in the midst of being completely debased.

Katsuki lets out a low chuckle, a deep, intoxicating, and mocking sound. He brushes the sweat-soaked hair away from Izuku’s forehead and kisses the tip of his nose, before driving his hips forward in another deep, ruthless plunge that sends the younger man’s eyes rolling back.

“This pussy of yours is way too young for me, isn’t it? But look at you… you’re milking my dick so fucking tight. You’re so dirty, Izuku. Crying while you play the whore for a man the same age as your own father.”

Izuku cries out, his neck flushing crimson as he desperately reaches up for Katsuki’s lips. “K-Kacchan... a kiss... please, Daddy... kiss me…”

Katsuki doesn’t disappoint him. The older man traps the younger boy’s mouth in a brutal, wet kiss. He syncs every deep suck on Izuku’s tongue with a heavy, grounding thrust of his hips, determined to claim the younger man’s soul from both ends at once.

“Mmmgh! Hah…” When their lips finally tear apart, a long strand of saliva bridges between them before snapping and dripping onto Izuku’s chest. “Your mouth is so fucking sweet, baby... but what you’re doing down below is so incredibly filthy.”

Katsuki kisses away the tears streaming down Izuku’s cheeks, before trailing his lips down his jawline, his neck, until he bites down hard on the younger man's shoulder while rhythmically hammering his cock deep inside him.

“D-Daddy! A-ah! It’s too... hngh... t-too deep!”

“You love it, don’t you? Want me to go even deeper? Ha, baby?” Katsuki grunts, his hips seemingly tireless as he pins Izuku down to the mattress. “Show me just how eager you are, Izuku. Kiss me... show me how badly you want this pussy of yours flooded with the cum of an older man like me.”

Izuku pulls Katsuki down once more for another hungry, desperate kiss, his legs locking even tighter around the pro hero’s waist, forcing every single inch of Katsuki as deep inside himself as physically possible.

The older man lets out a deep, guttural groan, accelerating his frantic pace without breaking their deep kiss. Every suck and bite on the younger man’s lips acts like pure gasoline to his desire, pushing him to completely break the innocent boy beneath him.

He hoists both of the younger man’s legs up over his shoulders. The position is completely shameless; Izuku’s flushed, twitching slit is completely exposed and pinned wide open under the fury of Katsuki’s cock.

“Does it feel good like this, baby? Should I thrust here?” Katsuki asks hoarsely, before driving his length completely deep.

"A-AHHHH! H-Hngh!" Izuku’s back arches completely off the mattress, his fingers clawing desperately into the sheets as he feels Katsuki’s cock strike the absolute deepest, most sensitive boundary of his womb.

Katsuki doesn’t stop. Every single thrust becomes fueled by pure, unbridled hunger. He leans down and traps Izuku’s lips once more, giving his boyfriend a desperate, suffocating kiss. They swap spit continuously while his waist keeps drilling relentlessly into the younger man’s inside.

“Mmmgh! Hah... Izuku... Daddy’s gonna cum,” Katsuki groans in the middle of the kiss, his voice wound incredibly tight with tension. “You’re taking all of it, right? I’m going to flood your inside with my cum until you’re swollen... Gonna pump you so full it drips out of you, baby. Make me a Papa again, hm? Tell me you want Kacchan’s babies stretching this tight little hole.”

"O-oooh... D-Daddy... yes! I want your babies! Breed me, Kacchan... make me pregnant, please fill me up!” Izuku sobs hysterically, his eyes completely rolling back as his internal walls violently spasm around the shaft, trying to suck every drop straight inside him.

On his final five ruthless thrusts, Katsuki deliberately grinds his shaft hard against Izuku’s sweet spot.

“Daddy! A-ah! K-Kacchan! ‘M close…AHHHH!"

Along with a long, shattered shriek, Izuku releases a powerful gush of fluid, his juices splattering across his own abdomen and Katsuki’s chest. The older man nearly chokes on the sheer pleasure when he feels Izuku’s internal walls fiercely milking and strangling his cock.

“Fuck... Izuku... baby!”

With one final, heavy drive, Katsuki bottoms out completely before releasing his hot, thick semen deep inside. Izuku can feel every single throb of Katsuki’s cock as it floods his pussy. 

The younger man pants heavily, his entire body trembling as his muscles completely give out. Every brush of air against his wet skin feels like live electricity due to how oversensitive he is. His inside is completely engorged with Katsuki’s heat, but the pro hero seems to have absolutely no intention of stopping.

“Kacchan... h-hngh... just a moment, please...” Izuku sobs. Overwhelmed by the sensation, he tries to shift his hips away.

His arms shake violently as he tries to crawl forward, his knees dragging across the wet bedsheets as he attempts to reach the headboard of the bed. His swollen entrance slowly weeps a thick trail of white cream with every inch he crawls. The sight completely breaks whatever remains of Katsuki’s sanity.

“K-Kacchan... m-maybe later... p-please... I can’t take it anymore... it feels too good...” Izuku begs again, burying his face into the pillow while desperately trying to pull away.

But Katsuki only answers with a deep, guttural growl. He completely ignores the younger man’s pleas. Instead, he clamps his hands around both of Izuku’s hips and violently yanks him right back against his frame.

“Where the hell do you think you’re going, huh? You think you’re getting off that easily?” Katsuki snaps, his voice dripping with feral hunger.

In an instant, Katsuki forces the younger man flat on his stomach. He shoves Izuku’s face into the pillow while hauling his backside high into the air, leaving him trembling and utterly wide open.

“D-Daddy! No! Ahhh!”

Without a single word of warning, Katsuki buries his cock right back inside from behind. It is a heavy, violent thrust that feels as though it’s pinning the younger man straight to the mattress. Because of the slickness of their combined fluids, the penetration is incredibly loud and wet.

With every slam of his hips against Izuku’s backside, he pairs the movement with low, ravenous praise. “Do you have any idea how good this pussy of yours feels? It’s completely choking Daddy’s dick, Izuku... you fucking need this, don’t you?”

Katsuki presses heavy kisses along Izuku’s back, leaving dark crimson marks, while his hands roughly twist into the younger man's hair to pull his head back. “That’s it... show me that completely ruined face. You look so beautiful like this, Izuku. So fucking pretty while I’m corrupting you.”

“D-Daddy... hngh! P-please... it’s too deep... ahh!” Izuku begs through his breathless pants, his fingers desperately clawing at the blankets. “D-drive it deeper... keep going, Daddy... ruin me more, p-please... don’t stop…”

“Yeah? Such a good baby... look at how perfectly you're taking all of my size,” Katsuki whispers, before bottoming out completely against Izuku’s most sensitive corner once more.

Their lips meet again in a messy, angled kiss, frantically swapping spit while the wet slamming sound between their thighs accelerates to a frantic pace.

“Go on, cry it all out for Daddy... don’t you dare stop screaming my name,” Katsuki whispers, every single thrust punctuated by the heavy smacking of skin against skin.

“D-Daddy... all the way, p-please! Bury it deeper... right there... ahhh!”

“Good boy. You’re being so damn obedient, baby,” Katsuki smirks, hammering into him even faster. His eyes burn with absolute lust as he watches his most precious possession get completely undone beneath him. “Keep taking it like that... you’re doing so well for your Daddy.”

“Ah! Ah! Hnghh!”

“Fuck, Izuku! I-I can barely pull out!” Katsuki groans, the veins in his neck and arms bulging fiercely as he feels every internal spasm of Izuku’s walls tightening and clamping down on his shaft. “You’re so good at this, baby. This pussy of yours is pulling me in so tight... look at you, you’re shaking like crazy but you still won’t let go of Kacchan’s dick. Is that how bad you want to stay stuffed with me, huh?”

“D-Daddy! A-ah! Cumming! Hngh! Fuck me m-more!” Izuku sobs, his eyes rolling back into a daze as his sanity is completely swallowed by the heavy scent of sex and Katsuki’s overwhelming heat.

“That’s it... scream it out, baby.” Katsuki grunts as he delivers the final sequence of rough, heavy thrusts. Every collision of his hips against Izuku’s backside accelerates until the only sound echoing in the room is the filthy, wet friction of their lovemaking.

“You’re so fucking perfect, Izuku... My good boy... My pretty little slut…” Katsuki whispers right before delivering one massive, final drive that bottoms out in the younger man's absolute depths.

“DADDY! AHHH—!”

Sensing that they are both on the very precipice of losing themselves completely, Katsuki refuses to pull away. With every deep, ruthless thrust he delivers from behind, he flattens his sweat-slicked chest tighter against Izuku’s trembling back. He tracks down his boyfriend’s hands where they are clawing into the mattress and splices their fingers together, locking their palms as one while their lower halves desperately mate.

“D-Daddy... hngh... I-I love you... it feels so good... ahh! K-Kacchan!” Izuku sobs, his eyes rolling back under the crushing weight of the overstimulation, his sanity fraying down to absolutely nothing 

Hearing his name like that snaps something vital inside Katsuki's chest. He buries his face in the crook of Izuku’s neck, his voice low, hoarse, and completely stripped of pride. “Fuck... I love you too, baby. You hear me? I love you so fucking much it’s making me crazy.” 

But right before their mutual climax, a possessive idea takes root in the older man’s mind. He lifts his right hand, and in the dead center of their frantic coupling, he lets off a controlled sequence of micro-explosions directly against his own skin. His quirk causes his palm to ignite, turning his flesh incredibly hot and searing. Armed with that burning palm, he roughly clamps down and squeezes the flushed, shivering cheek of Izuku’s backside.

“A-AHHHH! KACCHAN!”

Izuku shrieks at the sudden sting, but the sharp pain morphs instantly into pure, unadulterated arousal as he realizes this burning heat is a permanent brand of Katsuki’s ownership.

“You’re going to take all of this for me, right? You’re going to take all of the pain and all of my size because you’re the only one allowed to do this for me,” Katsuki growls, ruthlessly fucking his boyfriend. “You belong to me, Izuku. Even this skin, this flesh... I’m marking it all as mine.”

Through a final sequence of five deep, bottoming thrusts, Izuku can feel every distinct vein of Katsuki’s cock raking against the absolute back of his womb. Katsuki feels it too, the internal walls violently spasming and clamping around his shaft. A desperate, milking suction that signals the younger man is about to break all over again.

“Izuku… Together, baby... release everything for Daddy! Give me all of your filth.”

Along with a long, shattered cry, Izuku’s frame spasms violently. His squirt sprays ruthlessly across the pillow and sheets, while his inside milks his boyfriend’s cock.

Katsuki’s control snaps entirely. He lets out a deep, guttural moan filled with unbridled hunger and lust as he drives himself all the way to the very root of his shaft. It feels as though Katsuki wants to physically break into the deepest parts of Izuku’s core with every ruthless collision of their hips.

“Izuku... fuck... all of this is yours,” he groans, burying his face directly into the crook of the younger man’s neck, inhaling his scent. “I’m completely yours… nghh.”

Izuku can feel every single heavy, burning pulse of Katsuki’s semen filling his inside to maximum capacity. It throbs in wave after wave deep within his core. The intense heat of the semen and the burning mark left by Katsuki’s quirk on his skin bleed together, feeling like a sacred ceremony of absolute possession.

Slowly, Katsuki collapses his weight on top of Izuku, refusing to withdraw his cock, letting their bodies remain completely intertwined on the ruined bed. He presses lingering, repetitive kisses across Izuku’s sweat-soaked shoulders.

“Good boy... my perfect, sweet boy,” Katsuki whispers hoarsely. He strokes Izuku’s tangled, messy hair, drinking in the combined aroma of sweat and sex that heavily dominates the air between them. “You’re completely stuffed again, Izuku. Don’t you dare leave, you hear me? Stay right here with us... with me.”

Izuku buries his face directly into the pillow, his thighs twitching uncontrollably, barely able to catch his breath from absolute exhaustion. Yet despite the lingering sting, a small, fragile smile graces his lips. “Y-yes... I’m never leaving,” his voice cracks, completely thick with utter surrender. “No matter what you do to me... I only belong to you, Kacchan. I love you so, so much.”

The remainder of the night passes in a deep, peaceful slumber. In the midst of the quiet, Katsuki remains wrapped tightly around Izuku, as if terrified that the moment he lets go, all the warmth they shared will simply vanish. The mark left by his quirk on the younger man’s thigh remains a vivid crimson—a seal that no amount of soap or water can ever wash away.

Izuku wakes up with his entire body aching. He can still feel the residual twitching in his thighs and the intense heat Katsuki left deep inside him the night before. Even though moving is a struggle, he forces himself out of bed to prepare breakfast and tend to his responsibilities.

But when he steps into the kitchen, he stops in his tracks, utterly stunned. Katsuki is already fully dressed in his pro hero suit, while Kota is fast asleep in his crib in the adjacent room, having already been brought back home. Laid out on the dining table is a fresh spread of coffee and garlic fried rice.

Katsuki drops a thick manila envelope right in front of Izuku while the younger man is busy arranging the utensils.

“What’s this?” Izuku asks, a little bewildered.

“Just read it, don’t ask so many damn questions,” Katsuki grunts. He keeps his gaze averted, pretending to be intensely focused on drinking his coffee, though his shoulders are visibly wound tight with tension.

Izuku opens the envelope. The entire world seems to fall completely silent the moment his eyes land on the contents: an Official Internship Contract from the Dynamight Hero Agency. But this isn’t just any ordinary internship; the document outlines a position for a Senior Analyst, complete with a massive allowance, full insurance coverage, and unrestricted access to all of Katsuki’s top-secret laboratory equipment.

“Kacchan... what is the meaning of this?” Izuku’s voice trembles. “Your agency doesn’t even have an internship program for students. And this position is way too high for someone like me.”

“Well, it does now,” Katsuki shrugs, tossing his head to the side as a heavy crimson flush gradually creeps up his cheeks. “I spoke with the board. Told them I need an intern who doesn't just know their way around machinery, but someone who memorized my every move and all of my limitations. No one else in the world knows that shit better than you.”

“But the fee… and my duties watching the house—”

“Everything is already paid for. In short, the agency is the one paying you,” Katsuki cuts him off. He stands up from his chair and steps into Izuku’s personal space. He hooks a firm hand around the nape of his boyfriend’s neck, pulling him close until their foreheads are pressed together.

“Stop worrying about the damn money. Focus on how you're gonna make my next support gear even stronger. I refuse to watch you stall your life just because of a budget. I didn’t let you into my life just to watch you give up on your dreams.”

Right then and there, tears spill from Izuku’s eyes, but this time, they are born from pure, overwhelming joy. He throws his arms around Katsuki, burying his face deep into the hero’s chest.

“Thank you... thank you so much, Kacchan. I promise, I’ll do my absolute best to be worthy of standing right by your side.”

“You damn well better,” Katsuki whispers, his broad hand gently stroking the younger man’s back.

The pro hero pulls away slightly and glances toward the sleeping toddler. “I’ll look for a new nanny to watch Kota. My old hag knows some people we can hire. When we step into that Agency, I want your entire focus to be on me and the work. You’re not just a babysitter anymore, Izuku.”

A sweet, completely genuine smile graces Katsuki’s lips, a smile reserved exclusively for Izuku’s eyes alone.

“Because once you graduate, I’m not letting you go. Once you’re out of school, you belong to me full-time. In my bed, in my office, and behind every single win I have on the streets. You’re the only one allowed to dictate how I move. You’re my partner in everything. Understand?”

Katsuki presses his lips to Izuku’s in a deep kiss completely loaded with a lifetime of promises. With that single kiss, their journey begins as true partners in absolutely everything.