Chapter Text
It burned. Shoto’s lithe body wracked with tremors, spasming on his bed. He couldn’t understand where this sudden ache was coming from. Nothing was out of the ordinary; he had training with his father at their in-home gym, washed up in their Onsen, and was thumbing through a novel, when suddenly he was attacked by unseen forces. His temperature ran so high, even sheeted in ice, he felt a searing ache. In minutes he had slipped off his yukata and melted into the futon, listless and hot. Cocking his hips from side to side, Shoto rubbed his thighs together, to get some relief and give his dick the friction it craved. His fingers were curled into his blankets above his head; it just felt so wrong to try and touch himself, as if it wasn’t for him to do. The teen hissed softly as a hot wetness dribbled from his ass, oozing down his lower back and thighs, arching and struggling over the sheets. His right side had frosted everything it touched, and there lay a scorch imprint below his left. Shoto was parched, a dryness in his throat unquenchable, his entire body itching for something. He felt so frustrated. The teen could do nothing more than gasp in breaths, waiting for salvation to walk in and save him from this hell.
Perked ears heard the sound of approaching footsteps. A familiar voice hollered out ‘Shoto! You’re stinking up the place!’ right before the door slammed open. Enji Todoroki appeared in the doorway, decked out in his Endeavor gear, clearly about to leave for patrol. The U.A student’s nose filled with the smell of cigar smoke, embers and heated leather. Immediately he cried out, sharp and keening, legs spreading automatically as the Alpha's arousing scent bathed over him. “Wh-what’s happening… to me.” Shoto groaned, squeezing his eyes shut and then squinting, as the hulking figure approached; his thighs spreading wider with each heavy step. Shoto recognised the towering mass as his father for only a second, before he shut down, his Omega taking over, sharpening his senses and lulling his mind in a hazy fog. Ice-blue eyes quickly assessed their son’s condition, noting the pink flush from the tip of his ears to his toes, and the unfocused gaze that flitted from Enji’s face to rolling back into its skull.
Since not only was Shoto Enji’s son; but as a fully trained Alpha hero, Endeavor was unphased by the choking aroma of heat that filled the room, and the rest of the mansion. Doubtlessly, everyone was aware that the heir was under nature’s spell, especially with how loud his typically reserved child was being. The knowledge that his stubborn youngest would be extremely embarrassed when he came to and realised the entire mansion had heard his intense pleasure being dominated, amused Enji immensely. He could see it now: Shoto panting hard, face down in his sheets, with a hulking brute of a man, fucking him into submission. If it were any other Omega, or maybe because it was his favourite little disappointment, Endeavor entertained the thought of doing the job himself, proving yet again that Shoto would always be held under his father’s thumb.
Enji frowned, bringing himself back to the issue at hand; admiring the way Shoto spread his ass for Japan’s #2 hero. Eyeing the glistening skin, soaked with slick, and the two sex organs that continued to pump out fluid at a steady trail, he cocked his head in contemplation. His son always excelled in everything; so of course, being a good little bitch would come naturally as well. Oh, he was going to enjoy himself later. For now, it seems the boy was too far gone at this point and needed an Alpha to fuck him, as soon as possible. It was highly likely Shoto was going to be bred tonight, which would sorely put a damper on his training plans for the boy’s ascent to hero-ship, but such is life. You cannot help your biology. The Alpha in him immediately pin pointed the need for preparation; his son would need lots of water, with hydrating and energy boosting food. Also, a lot more blankets, so that his half-assed nest of a bed would be more filled out and complete, to soothe his Omegan anxieties.
“Shoto-” Enji was cut off by a particularly stirring moan, ripping out from the squirming pile of long limbs on the bed. The hero veteran cleared his throat and tried to ignore the way his son wailed at every noise he made. “You’re presenting as an Omega. At least you seem to be S-class. Anyway, you’re going into heat.” Enji muttered, slightly irritated that his greatest creation was part of such a vulnerable secondary-gender. But it made sense; Omegas were generally a margin more powerful than Alphas with their abilities, but their weakness was crippling when unmated, whereas Alphas had none, simply more stable when mated. Because he was an Alpha and Shoto’s mother was a Beta, he never thought they would have this issue. It seems his calculations were wrong.
Enji sighed as Shoto continued to wail and wriggle on the bed. The father could see the war in his boy’s mind, he had seen it many times with the Omegas he bedded: the need to have eyes on their Alpha, fighting with the need to turn over and present, humping at the nest. “Is-” Teeth grinded as a breathy moan slipped from the dual haired teen’s plush lips. “-there any Alphas you want me to contact?” The confused whine made him want to groan in aggravation. He gritted his teeth and ploughed on, intending to get his son attended to ASAP. “You need someone to breed you.” He grimaced at the particularly loud cry of delight. “Hmph, well-” he groused, rubbing his fiery beard in irritation. “I need to know if there’s an Alpha you want to bare children for-”
“Mmm, yes Alpha~” Shoto moaned softly, jerking up slightly to get a better look at his Alpha. “Breed me!” he demanded, thundercloud grey and stormy blue eyes cutting, as if indignant at the fact that his Alpha hasn’t touched him yet.
Enji blinked, a slight stupor freezing him for a moment before he glared back. “Do not talk to me like that young man. I am your father. Disrespect me like that again and I will beat your ass so hard you won’t be able to shit for a week.” The growl of his voice was like thunder. The harsh snarl that followed, menacing to literally everyone else in the world, surely, but instead; Endeavor just gaped as his prodigy came all over himself with a cry of ‘Yes Alpha.’ Eyeing the sticky, twitching mess on the bed with distinct unease, Enji furrowed his brows. “Shoto… do you know who I am?” He edged, grasping the thin, trembling wrists in his large hand, stopping Shoto from fingering himself any further. He didn’t need the boy hating him even more for inane reasons; like remembering that he finger fucked himself during his first heat because he wanted to tempt his Dad into fucking him. It would be a ridiculous argument.
“Mmmh, my Alpha.” Shoto growled softly, tongue tracing his lips and flicking the air, wanting to inhale all he could of the buff man’s heady scent. He was much tamer now, still high off his release.
“I’m your father.” Enji bit out, wanting the Omega to snap out of it, so that he could begin his heat week (after an Omega goes into heat, he needs to be fucked for a period of time, generally lasting a week, and stretching out to a month extremely rarely, with particularly compatible mating pairs). For some reason, the Omega didn’t register their blood as kin, he needed Shoto to snap out of it, so he could go find the boy a suitable Alpha, possibly one with a stamina or speed quirk. After an Omega chooses who they want to mate, they were very hard to dissuade, and he could severely injure Shoto’s Omegan mental-state if he’s being rejected by an unmated Alpha. The boy would need way more therapy than he had the time for; they had a goal to achieve.
Thinking hard, Enji strode purposely up to the boy and gathered Shoto in his arms, much to the needy Omega’s delight, shoving his son right up against his scent gland, willing the omega to comprehend their blood relation. Enji’s eyes almost boggled when Shoto’s cum splashed across his shirt, the Omega riding out yet another orgasm, fucking the air in pleasure. Hungry lips mouthed at the sensitive area, causing the hero’s previously flaccid cock to twitch with interest. He groaned in resignation as he realised he just made things exceptionally worse. His mark was now over Shoto’s face and on his tongue; if the Omegan part of him continued to refuse to scent their kinship, there was nothing he could do. In a way, he supposed this was his fault, for being so detached from his children. Still, this was not unheard of… generally an Omega class would find some advancement of interest from their Alpha relatives when they present, but generally their Omega would recognise the familiar scent and the Alphas wouldn’t be able to get much more than maybe fingering them, in… of course to happen with their parents seemed to be much rarer.
Steeling himself, Enji hollered for Shoto’s personal maid. Barking out orders, he began preparing Shoto for his heat week. Ignoring the judgmental glare, he dismissed the nosy Beta with explicit instructions that for the next week, she will bring food and drink at precisely 8am, 1pm and 7pm, leaving it outside the door, and that no one was allowed in or anywhere near Shoto’s wing of the mansion till the heat had passed. His eyes narrowed at the scathing look directed to him but held back his need to backhand the women. He would have to get accustomed to it around the household. In public he would make sure no one is aware of whose children Shoto would be carrying, but anyone in the household no doubt would be well-aware with his own disappearance. After she left, he called his organisation to explain to them his son had presented and for the next week he will be ensuring the Alpha assigned to his son is doing the job right. He really emphasised the ‘my favourite child/heir/prodigy’ and the ‘I don’t care if Japan is going to shit, don’t contact me.’
With a suffering sigh he turned to irritably eye the flushed teen, methodically adding the extra blankets to his nest. His frosty orbs trailed over the slight curve of his son’s back, and over the plump globes of his ass, dripping slick over the new materials. Tracing his teeth with his tongue, Enji approached cautiously. Shoto tossed a look over his shoulder, and for a moment Enji thought Shoto had finally recognised him. That hope died a particularly fiery death when a low purr shook the boy, as he scrambled over to tug off his Alpha’s clothes. Enji shrugged off his shirt accommodatingly, unbuckling his pants and dropping those too. He smirked when Shoto spurted at the sight of his heavy mass. Shoto nuzzled the massive head, before sliding his nose down the fat flesh till it was buried in coarse red pubic hair, drowning in the pervasive odour and smearing the thick beads of pre-cum over his face. His fingertips barely touched when he wrapped both hands around the meaty rod, dragging the thick foreskin up and down as he stroked his father into full-mast.
“When you come out of your heat, you are going to be furious.” Enji groused, threading the blood and snow hair in his meaty fingers, pulling the boy up to his lips. The two slotted together salaciously well, tasting like sweetened molten lava. Thick steam swirled around them as Shoto’s icy half was held under the burning sear of his father’s skin. Their heat quickly set fire to the blankets and merged together, fusing in an objectively beautiful way, filling the blessedly fireproof room with the smell of burning material. It amused Enji that, his power was fucking his son’s powers. More interesting revelations came when he noticed happy little fingers raking over the hair smattered on his chest, combing through it with playful enjoyment. ‘What a naughty little thing you are under that stoic façade, Shoto… to think you enjoy having an older male dominate you; the height difference, hairy chests, muscles… In light of this, I’m surprised our training sessions didn’t go much better.’
“Mate.” Shoto murmured into the kiss, lapping at his Alpha’s mouth. Ice seemed to have flooded Enji’s veins at the word, all amusement evaporating… He had wanted nothing more than to stay extremely important to his creation, and in his lap dropped the chance. Previously, he had never cared enough to mate any of the Omegas he fucked, and since Shoto’s mum was a Beta, they never had that issue either… But, to his son? Was Enji cruel enough to take the boy, outside his right mind? The Omegas he had lain with prior were experienced, and never wanted to be his mate for more than his money, looks or power. And, he ensured never to go through a heat with them after that first girl. She had needed to go to hospital after he refused to mate her due to personal preference and his own agenda. Could he put his own son, his admitted favourite, through that same pain and trauma? What’s worse?
Enji was to be Shoto’s first lover, the boy would undoubtably bare Enji’s children (he was quite potent), and the Omega wanted his Alpha. Likely, if Enji refused to mate his son, Shoto would suffer through his entire heat… but he would live, and when he snapped out of the heat spell, he would be hospitalized, yes; but he would not be mated to his dad. On the other hand, Shoto was going to be pregnant with his pups anyway, and for the entire pregnancy, any pseudo heats (since he’s already bred) would have to be taken care of by Enji. Contemplating it, the hero acknowledged that being mated to his son came with its own set of complications. He would have to rely heavily on his training in order not to reveal their bond. The jealousy and attentiveness will have to be curbed in a way that doesn’t affect their mating, but also kept their privacy. He would be expected to mount his flesh and blood on a regular basis, after his ‘obligations’ were over as well… was he prepared to do that? Was he prepared, as a father, to fill his son’s belly with his semen and impregnate him with his children? His grand-children? Unbidden, a few images flashed through his mind: Shoto’s sphincter stretched around the wide girth of his cock; the same cock ballooning the walls of Shoto’s throat as the teen deep-throated Enji on his knees; Shoto’s belly swollen with Enji’s children and his cum; them lying in bed with arms full of half-white, half-red-haired cubs.
Enji allowed his body to relax into the tight embrace, his decision made. “Mate.” His Alpha purred, palming the fleshy cheeks of Shoto’s full ass and nuzzling into his scent gland. He was going to make sure his son’s memories would be filled with blinding pleasure, he would make it better than the teen could ever dream. With a long, heavy drag of his tongue, he lapped at the juncture of Shoto’s neck, eliciting a string of soft, breathy moans. With his teeth bared, he bit down, digging deep enough to scar, before the older man moved off, swiping up the blood with a flick of the hot muscle. Shoto bucked against the firm wall of his father’s stomach, pulling them down into the nest, so that he could flood it with his Alpha’s scent. Enji followed his son dutifully, running large hands down from knee to hip, splaying the creamy limbs wide.
“Daddy’s gonna take good care of his baby boy.” Enji crooned, dry humour lacing his words; but his eyes darkened at the shiver that shot through the boy beneath him. His hot palms slid up the figure of Shoto’s narrow waist and ran up to cup the fleshy pectorals. Grinding gently down, Enji slid their cocks together, dwarfing his youngest’s by two thirds. Rough, thumb-pads rolled over Shoto’s sensitive nipples with every roll of his hips, enjoying the strangled yips of pleasure and the sharp heels digging into his chiselled back. “You like having daddy’s attention?” Enji husked, laving a tongue over the delicate shell of his little boy’s ear. “Is that why you were so rebellious?” he huffed out a laugh at the ludicrous notion, trailing one hand down to trace the soaked, puckered rim. “You wanted daddy to fuck your greedy little hole with his big, fat cock? Hmm, you needy, little slut?” He growled, swirling his middle finger in the thick lubrication before easing his way inside. “You were never angry at all, were you? Just a stubborn brat, wanting to be Daddy’s good little boy.” His finger plunged deep, twisting and crooking and working the tight sphincter open, fucking another finger into the slippery entrance.
“Mmm-Yes Daddy. Wanted you… My Alpha.” Shoto shuddered, fucking his ass on his father’s talented fingers. Enji gritted his teeth hard, his rod pulsing as the blood rushed to his cock. Fuck, he was going to make sure that was the only way Shoto referred to him ever again, aside from Alpha, and Mate. His chest puffed out in pride as he let another finger slide into his son’s body. His Alpha was extremely satisfied, the feeling of pleasing his Omega, mixing with pleasing his son was a potent combination. The sweat of their bodies dripped and sizzled over their flesh, acid to anything that wasn’t their skin. “Alpha, mmm~ ahhn! Daddy, more!” Shoto’s nails raked down the older male’s beefy biceps, ass clenching tight around the meaty fingers, sucking them further into his body. “Please Alpha. Your Omega needs your big cock.” Shouto whined, massaging his lover’s mammoth cock, trying to feed it into his hole, regardless of his dad’s fingers already inside him.
Enji chuckled darkly, sincerely hoping Shoto remembered that, along with all the other such comments he intended to get out of the boy. Following the needy motions, he recoiled his fingers from the stretched cavern. In a quick, jarring motion, he grabbed a firm hold of Shoto’s ass, pulling the boy down roughly and spearing into him. Shoto choked, unable to breathe as tears prickled his eyes. The burning sensation zipped up through his body and seized his throat, his mouth dropping obscenely wide, as if the giant shaft had slammed up his ass and reach all the way to his throat, trying to fuck itself out of Shoto’s body from his other entrance. “Is my baby boy looking forward to his daddy filling him with his big knot? Gonna breed you all week, have your stomach bulging with daddy’s hot cum.” Enji growled, administering a sharp slap to Shoto’s ass. That evoked an odd feeling of nostalgia, as he remembered Shoto over his knee 10 years ago, as he dealt out punishment for the boy’s many failings. That may be something he wanted to revisit.
Shoto shuddered in satisfaction, melting into the sheets as his anal walls relaxed completely around the thick intrusion. He could feel his heartbeat synchronizing with the jerking throbs of Enji’s penis, his body pulsing with each subtle motion. The war his body raged finally succumbed to utter pleasure as his need to be stretched wide over his dad’s erection was finally sated. His Omega screamed for the knot, incredibly proud and hot over the fact that their Alpha was so big, so much bigger than other Alphas, surely. It was such a rush to have a dominating Alpha of his father’s calibre; his lover was the closest thing to a Platinum Alpha you could get, as an S class, and it made his blood sing. “I’m so hot Alpha, it’s burning me from the inside. I can feel you everywhere. It’s like you’re filling up my entire body.” Shoto murmured, thigh moving up and down his father’s long side-frame. “Such a generous Alpha, you’re making me so happy, your Omega is so pleased, so stretched and filled.” Dark pools peered at him coyly through hooded lids. Shoto’s hands tossed up and away from his body in a show of submission, baring his throat, revealing his trust in his Alpha to please him entirely. “Stay inside me forever.”
Enji had a tight control over everything in life… except his son. Shoto’s defiance and hatred towards him was something he thought would be next to impossible to dissuade now, cultivated through years of loathing. This opportunity to lay claim on the one thing he wanted aside from the number 1 spot as hero; his creation, his most precious possession… well, any doubts he previously held evaporated, and Enji could feel himself sinking into the fire and ice below him with acute need to drown the boy in his scent. “I want this.” Enji admitted, hoping it struck Shoto in his core as soon as the heat wore off. “I want to fuck you… My baby, my creation, my favourite son.” He growled low in his boy’s ear, pressing his weight down completely before lifting his hips up and slamming home. To anyone else, his hot skin was blistering to the touch, his cock was like a fleshy branding iron, and his cum, scalding. Shoto’s mom had to ice her inner walls and skin during every coupling. But not Shoto; no, his son was made to take his dad’s dick, they were each other’s perfect temperature.
“I want this to happen. I won’t regret it. I want to own you completely.” Enji husked as Shoto jerked in pleasure; the teen was unable to take his eyes off his mate. Their orbs locked in a heated gaze, as Enji beat a sharp, methodical rhythm into Shoto’s body, meshing their lips together between Enji’s statements. Every stroke of the fiery muscle branded the teen’s anal passage as his father’s domain. “I want to have you below me daily, son. From this point on, I want your stomach to be swollen with my seed so everyone knows you’re claimed even if we’re separated. When you graduate, I want to take you as my hero partner, so that you will remain trapped in my arms.” He deep vibrato shook Shoto’s entire body. “Do you understand, Shoto? Your father, the monster you hate; wants to fuck and impregnate you for the rest of our lives… You were right, I’m a bad man Shoto, to want an incestuous relationship with my son, my own flesh and blood. Burn in hell with me Shoto, stay with me so that I can fuck you, and keep you, and own you.”
“YesyesYES, mmpleaseAlpha, please! Never want to be apart from you. Need you Alpha, my Alpha, fuckme, mmff fuck your son, I need it. I want your seed Alpha. Fill me with our pups!” Shoto begged, voice soft and low, soothing as he lapped at his Alpha’s lips. His flushed body moved in perfect sync with his dad’s. Slowly his cries gained volume and pitch, their bodies bucking together in a slow grind, his nimble fingers clawing into the large bulk of his Alpha, trying not to separate their bodies even an inch. Enji felt his rut begin to overtake his motions and he sped up the pace of his thrusts, wanting to brand the harsh slaps of his heavy balls on the sensitive milky skin of Shoto’s ass. The tatami was moved so furiously it was slipping and Enji had to haul Shoto into his arms and bring him down onto the floor, pining one of the boy’s feet down beside his bouncing ass, his other hand pining the boy’s shoulders to the floor, fucking rapidly into the tight heat.
“Daddy’s little cocksleeve.” Enji groaned in satisfaction, feeling his knot start to build, catching slightly at the rim of Shoto’s ass, eliciting short spurts of pre-mature ejaculation from the teen. Shoto was feverish with pleasure, going through constant mini-orgasms as his father chased his own end, his cock bobbing in all directions because of the powerful force of Enji’s ramming hips. When the knot grew big enough not to jerk out of the boy in the haphazard motions, both sweaty masses sounded their relief. They clung tight to each other as Enji melded their bodies together, teeth embedding themselves back into the mating mark and pounding shallow thrusts into Shoto’s needy hole. Shoto’s tongue hung from his mouth, drooling slightly as he attempted to inhale Enji’s scent, lapping at his fiery cheeks, wanting to breathe in his father’s flames. He never wanted this feeling to end.
Enji knew a split second before he snapped, taking hold of Shoto’s hips and forcing the boy down hard over his cock, attempting to shove his balls in the expanded entrance along with his knot. Shoto came with a scream, his body jolting spastically with every spurt of sizzling cum filling his belly. The liquid ropes burned him to his core, whipping at his ribs and stretching his belly full, leaving the teen to gape up at the ceiling, eyes blown wide with ecstasy. His anal walls clamped down hard on the inflated intrusion, milking his father burning semen for all he was worth. ‘Which is a lot.’ Shoto thought, deliriously, taking in a shuddering lungful of air as he rubbed his stomach in satisfaction, enjoying the light slaps against his palm. A rumbling purr quivered through his body, his fingers enjoying the sensation of the stretch, as more of Enji’s boiling seed took root.
The omega eyed his bloated tummy with delight, appreciating the smooth curve that rounded the large bump; he could almost feel his pups being conceived. He sincerely hoped his stomach would never be flat again; Shoto wanted to carry a belly full of his father’s cum inside him for the rest of his life. He just loved feeling it slosh inside him with each motion, the heat of it melting away his worries. His hand moved lower, to the base of his dad’s cock, fingering the pubic hair playfully, before creeping down to massage the heavy scrotum. They were so big, he couldn’t enclose even a single sack in his long fingers. ‘They’re going to give me so many pups’ Shoto moaned long and loud at the thought. Looking down now, he truly understood the sheer size of his Alpha, the cock easily doubling the circumference of his wrist. It would have been smaller if the Omega had simply fisted himself. Another mini-orgasm rocketed down his spine at the thought; coating his father’s hairy chest.
Enji cocked a brow curiously, as Shoto’s other hand trailed up into the fiery curls that lightly covered the expanse of his torso. ‘I wonder if he’s going to keep doing that.’ If Enji had to make an educated guess, he would say that the action comforted the teen. Tucking that tit-bit away for future reference, he gently started to massage Shoto’s ass over his knot, helping the boy in his mission to extract every swimmer from Enji’s balls. Knowing this was going to take at least an hour, the hero entertained himself with slobbering kisses and whispering filthy desires into Shoto’s soft skin. After attempting to impregnate the boy with a few more knots, in case his son hadn’t conceived already, the father figured he would give the teen a 20-minute break to refuel and drain some of the spunk from his belly, before filling him with fresh seed. As Shoto leaned up for a kiss, he took hold of his father’s hand, bringing it to his stomach with soft eyes, as if to say, ‘Look at what we’ve accomplished.’ Enji had never felt more proud of his son.