Chapter Text
In Kirishima’s defense, it was not his fault.
Okay, maybe it was his fault. But it certainly wasn’t his intention.
It started when Kaminari had to go out of town for a few weeks on an unorthodox work-study, if only for the timing of it. Recently, though not too recently, the yellow-haired boy had found himself in a relationship with the Class 1-A sweetheart, Izuku Midoriya. It’s probably been a few months, at least. Even so, there was some discussion as to whether or not they would actually want to spend that much time apart. Ultimately, it was better for the blonde’s future career for him to go, so they parted with a heartfelt goodbye. Kaminari gave Kirishima a goodbye as well, but his included a favor.
“Look out for Midoriya for me.”
When he was first asked, Kirishima felt proud that the blonde would ensure his boyfriend’s care to help. Accepting the challenge was simply the manly thing to do. Besides, Midoriya could take out a building with a single punch if he wanted, so he doubted he would actually need much from Kirishima. It would be fine.
It should’ve been fine.
But...about two weeks in and there were definitely some noticeable changes to Midoriya. Besides the normal feelings associated with missing a lover, there was another discomfort he was experiencing from being so far apart. And Kirishima could hear it. He remembered stopping by the other’s room to see if he was doing okay only to be stopped short by the sound of moaning - sweet, heavenly moaning. Midoriya was masturbating. Which was cool, because that was a totally normal, totally healthy thing to do. Except then Kirishima started to see the discomfort as well. He saw the way Midoriya would press into anybody’s touch, or how he would accept physical contact a little more easily. It looked like the green-haired boy was getting antsy, and the lack of intimate affection was getting to him.
So, Kirishima thought he would help. He had promised to look after Midoriya, after all. And if he’s uncomfortable day in and day out, then his grades might start dropping. Midoriya reallycared about his grades.
But of course, Kirishima wasn’t going to have sex with him. That would totally go against the bro code. And it would be cheating. Just completely uncool. But he needed to do something. And then, as he was considering the different possibilities, he remembered one conversation that he and Kaminari had while the blonde was spotting him at the gym. Kirishima wasn’t sure when it was brought up, but Kaminari had let slip that Midoriya really, really loved the smell of cock. The way he said it made it sound like quite the experience for the green-haired boy. And with this knowledge, Kirishima had a plan.
It was the reason they were both in Kirishima’s room now, Midoriya looking rather uncomfortable, and confused, as he watched the red-haired boy. Kirishima was laying on his bed in nothing but a jockstrap. He had a few since he preferred to wear them when he worked out.
“So...can you explain it...just one more time?” Midoriya asked as he tried to hide the slight blush covering his face. Kirishima found it cute. Denki was lucky.
“I need you to help me pick out a design for what to wear under my hero costume!” Kirishima replied. He gave the other a toothy smile.
“T-the design...for your jockstrap..” Midoriya continued, trying to get the details straight in his head. “Because your clothes tear when your quirk’s at full power?”
“They can, yeah!”
“But...Kirishima...why don’t you just wear normal underwear?” Those emerald orbs glanced back at the bulge confined beneath the fabric, and then quickly looked away again.
“I can’t do that,” Kirishima insisted. “Normal underwear is too constricting, and it chafes beneath the uniform. Please, Midoriya? You’re really the only person I feel I can ask.” He gave the other some rather convincing puppy-dog eyes.
There was a long pause, and then, finally, Midoriya gave a sigh. “Okay...I can help you.”
“Great!” Kirishima exclaimed. “Now get undressed!”
“Wait! What?!” Midoriya’s face went red, and he took a step back from nearly-nude boy. “W-Why?!”
“Well, I can’t come to a decision unless I see what it looks like fully. And I can’t do that if I’m wearing them all, so I need you to try on some pairs and help me decide!” Kirishima could see the hesitation in Midoriya’s eyes. That’s okay, because he expected it. “Come on, Midoriya! It’s not like I haven’t seen it all in the locker room. You can even leave your underwear on for now!”
The pause was much longer this time, and Midoriya seemed to be battling between a few different thoughts in his head. Still, he seemed to eventually resign to helping his friend, and he slowly stripped down to a pair of tight, sleek, green briefs. Kirishima could have looked away, but man, Midoriya had such a nice bod. Good, tight muscles under skin that still looked so soft - it was a sight to see. And his behind...he knew he shouldn’t look, but man, it filled out those briefs completely - so round and plump.
“S-so, what now?” Midoriya asked, his hands moving to cover different parts of his stomach or chest.
Kirishima gave a small thrust of his hips into the air. “Come get a look at these and tell me what you think!” The action made the green-haired boy blush, but he still slowly came over, a slight frown adorning his face.
“I - I don’t know,” Midoriya began. He took a place near Kirishima’s feet and leaned forward to examine the jockstrap more closely, even as his face steadily grew redder with each passing moment. “It’s...it’s nice, I guess...at least it fills out well…”
Perfect, Kirishima thought. As soon as Midoriya was close enough, he reached down and pulled the bottom of his jockstrap pouch up. At the same time, his other hand reached up to pull Midoriya’s head down and, with the other’s yelp, pushed it right up against the bare cock, his nose pressing into the pubic hair. And then he released his jockstrap, the fabric snapping tightly as it held Midoriya’s head in place, his green hair poking up past the stretched waistband. Kirishima hissed at the initial friction. The other boy gave a few muffled cries of panic and attempted to pull his head out. However, the jockstrap was normal-sized, and now with Midoriya’s head held inside, it was a tight fit. It didn’t come loose easily. Kirishima didn’t even have to hold Midoriya there. He just reclined back and rested his hands above his head.
“How’s that, Midoriya?” he asked, and he could see the bob of green hair pause in confusion. “I noticed you were getting antsy without Kaminari, so I wanted to help. Must suck not getting to have sex for a few weeks. But this will make it easier! Now, you can get off with me without us ever having sex!”
His words, oddly enough, didn’t seem to calm Midoriya. Instead, he tried to pull his head out again, but to no avail. It was more difficult to do from his current position. Not to mention the smell...it made him dizzy. There was so much musk, and it filled his lungs with every inhale.
“Kaminari said that you like the smell of cock, right?” The way Kirishima said that so innocently almost prevented the choking sound that Midoriya produced. His secret was exposed. “Well, now you can smell all you want. I’ll be here until you’re finished, man, so be as greedy as you want!” Kirishima reached up to grab the remote behind him and, with a click, flipped on the TV. “Oh, and I wore that for three days without washing down there, so the smell should be pretty strong by now.
He wasn’t wrong. It practically fumed into Midoriya’s mind. He felt like he should struggle more, or maybe try and talk with Kirishima, but his body was melting against the warm flesh. He could even feel Kirishima’s cock pressed against his face, and it was so thick. It made him shiver slightly. He didn’t want to admit it, but the experience of being trapped in Kirishima’s jockstrap while he wore it made him hard almost instantly. And he missed the touch of bare, hot skin against his own.
And, All Might, the smell. It was so, so strong and so, so manly. It smelled like pure Kirishima and Midoriya honestly couldn’t get enough of it. It was like a drug, one that he greedily breathed in after every exhale. And as he remained trapped between the tight fabric and searing skin, his face pressed into the cock and balls and red pubes...he felt himself relax. He just gave into it, allowed it to happen as his mind dropped into that state where it was hard to find a thought, to wear it was like he was floating on a cloud. His cock twitched inside his briefs.
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Kirishima hadn’t been paying attention to how long they were there, but it was probably a few hours by now. He’s watched a lot of TV, but that was hardly the best entertainment in the room. No, what he liked most was feeling how well-off Midoriya was getting. Due to their positioning, Midoriya’s waist was just around the redhead's feet. It meant that he felt when Midoriya had gotten hard right out of the gate. He could also feel when the boy orgasmed, his warm, wet seed seeping through his briefs and dampening Kirishima’s toes. The red-head felt himself smiling at that. He enjoyed the fact that he could help out Midoriya like this, and he found himself petting the other’s green hair with each new orgasm as he offered words of praise. Since starting, Midoriya had managed to cum three whole times.
The red-head would be lying if he said that he wasn’t enjoying himself. He tried not to, but there’s no way having the green-haired boy pressed into his crotch for hours wouldn’t have an effect. It was especially noticeable when Midoriya turned his head lightly just to press his nose right into Kirishima’s balls, or when he snuggled down further into the tidy pubic hair, lips grazing the redhead's shaft. Needless to say, his cock was erect. The shaft stretched up along the side of Midoriya’s face, pushing against the jockstrap and managing to tent it even with Midoriya’s head already stretching it further than normal. And every time he heard Midoriya mewl, muffled against his skin or his balls or his cock...well, pre was flowing steadily from his tip.
It was around this time that Kirishima decided to check in on the boy. He’d been trapped in his jockstrap for hours by now, after all. It had lasted far longer than he thought it would. Thumbing the rim of the fabric, he pulled up the top to see the other’s face. “Hey Midoriya! How you holding u-...”
Fuck, Kirishima thought. Midoriya’s nose was pressed next to the base of his cock, those lips pressing right against the shaft. And his eyes - those wonderful, emerald eyes - stared up at Kirishima, foggy and dazed, with the most lustful look the hero’s ever seen. The way he met Kirishima’s eyes - it was like Midoriya was just begging for more. A hand reached out and pressed into the fluff of green hair. Midoriya, with a mewl, closed his eyes and suckled lightly against the shaft. It was like a knee-jerk response, but…FUCK!
If Midoriya wanted it, who was Kirishima to deny him?
And then they were moving. Kirishima quickly helped Midoriya out of his jockstrap before pulling the article off entirely. He grabbed at the fluffs of the boy’s green hair and positioned him just above his swollen cock head. Midoriya swallowed it greedily, his tongue hungrily swirling around the tip to gather the pre. He moaned, and in turn, the red-head let out a grunt as he fought to pull Midoriya down to his base. It wasn’t a long-lived fight. The moment the emerald-eyed boy started swallowing up more of his shaft, Kirishima yanked him by his hair, dragging him back down to the pubes he loved so much.
And man did he look good like this. His lips were stretched around the girth of his cock in such a sexy way. His nose was buried into the musky skin, green-hair hovering above the red. As he inhaled, his eyes fogged over more. And, fuck, Midoriya was staring at Kirishima with so much want.
Kaminari was a lucky guy; Midorya was one hell of a cocksucker. Even when Kirishima used his eight-inch, beer-can wide cock to stretch the boy’s throat, Midoriya took it like a champ. The initial gagging, his throat convulsing in ways that felt real pleasurable, subsided almost instantly. And now, Midoriya dutifully sucked against the length, those warm wet walls tightening in tangents against the sensitive flesh. And he did this thing where he sucked in and...back? Kirishima wasn’t sure, but it made him feel like a vacuum was pulling at his head, making it quiver as it leaked profusely.
Kirishima pulled the boy by the hair, slowly dragging him up along the shaft before yanking him back down. It made his head spin, eyes rolling back as the other moaned into his flesh. He wasn’t going to last long at all. A few more repeats of that action and the redhead's cock was quivering on the brink of release. He came with a grunt, but not before pulling Midoriya back up until only the head was in his mouth; he wanted the boy to taste it. His seed spilled out onto Midoriya’s tongue, bulging out his cheeks as it quickly filled his mouth. Midoriya’s eyes rolled back. His body quivered as Kirishima felt him cum against his feet, the well-used rod still confined within the fabric.
The red-head watched with a heated gaze as Midoriya started greedily swallowing mouthful after mouthful of his seed. And the boy looked so blissful while doing it. Kirishima didn’t think he'd ever cum so much in his life, and the sight did nothing but increase the load. What really did him in though was when Mirodiya opened his eyes again, that same dazed and lustful gaze just desperate for more.
They moved again. Midoriya was on the bed, and Kirishima was over him, feet pressed on either side of the boy with his waist positioned above the other’s face. It was the perfect position to thrust down into Midioriya’s throat. His knees were bent as he pistoned wildly between those soft lips. His hands reached down to grip the green hair tightly as he pulled Midoriya up into his crotch. Kirishima fucked the other’s throat like an animal, his eyes rolling back into his head as Midoriya moaned constantly against his shaft.
“Fuck Midoriya! So good! S-so good!”
Kaminari’s boyfriend was such a sexy little thing. His stamina could match Kirishima’s, but he still wouldn’t have sex with him. No, that would be cheating. And no, a blow job doesn’t count. It was almost sex, but not sex. No. He wouldn’t, even if Midoriya sucked his cock so well. Even if he wanted to hear Midoriya’s moans...such soft, sweet moans...o-or make his stomach swell with his s-seed...o-or...or...or watch as that perfect, freckled ass swallowed his cock. Midoriya’s face was pushed into the pillows, hips held high, as Kirishima completely ravaged him. He hammered into those soft, searing insides, feeling the other’s walls tighten around him with every motion. Midoriya screamed in pleasure, calling out his name as he begged for more. And Kirishima gave it to him, pulling his head up by the hair while the redhead's other hand slammed Midoriya’s hips back against his waist.
“So good, Midoriya. Such a good boy.” Kirishima’s words came out between his pleasured grunts. He was sweating - they both were - as they vigorously fucked with abandon. He dinked in the sight of Midoriya’s soft and supple curves, which remained prominent even with the added muscles. “You’re so pretty. Such a sexy little good boy.” The words were gruff as the red-head pounded Midoriya into the sheets. He could feel the boy tighten harshly at the words, a sweet little mewl tumbling from Midoriya’s lips.
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Kirishima doesn’t know how many times he’s cum inside the boy, but it feels like he’s spilled gallons into the boy. As soon as he pulled his aching, expended cock from the gaping hole, semen flowed out in a cascade. The hole spasmed and twitched as it tried to squeeze down on something that was no longer there. Midoriya was up against the headboard, knees bent and legs spread apart. His form trembled from overstimulation, and he just looked so fucked. His eyes were wide and glazed over as he stared off into space. His mouth hung open in a wide, blissful grin. The boy just looked so ridiculously happy to be filled with Kirishima’s seed, his stomach bulging slightly. Mumblings fell out of his mouth non-stop as his hands kept his hole pulled open.
“...so good...c-cock...please, more...i love Kiri’s cock…”
Kirishima couldn’t help but chuckle at that. If he were being honest, he felt rather proud of the state he put Midoriya in. “Yeah? I love your ass.” He leaned forward and pressed two digits into that gaping hole. The green-haired boy jolted from the pleasure as they prodded his over-sensitive walls. “Hey Midoriya, you’ll give this to me, right? Kaminari can have the rest of you, but I want your ass.”
“ah!...y-yes!...Kiri’s cock...a-ass belongs to Kiri’s cock!...”
Kirishima couldn’t help but smile at that. “Good boy, Midoriya. Such a good boy.” He ruffled the boy’s green hair.
“...K-Kiri’s good boy….cock...m-more cock!...”
Yeah, Kirishima could go a couple more rounds. But first, he wanted to take a photo. No way did he want to forget this sight. Moving back, he held up his phone and opened up the camera.
“Say cheese!”
“...Cock!...”
“Close enough.”
Click!