Work Text:
He didn’t know how the fuck they ended up here.
Well, that’s a lie. He actually knew exactly how they ended up here and it involved a game of spin the bottle, a bit too much smuggled alcohol, and two pairs of loose lips that both admitted they were total virgins.
And it's not like it mattered, not really, and especially not in their class. They may all be 18 and months away from graduating but between their rigorous studies and trying not to die whenever a group of villains to decide to take their shot at them, it wasn’t like many of them had actually had time to fuck. Only the established couples admitted to it, Round Face and Froggy with blushes and stutters and Pikachu and Eyebags with no shame at all. The rest of them either hadn’t had time, hadn’t found anyone they were interested in enough, or weren’t interested in sex at all.
A part of him kind of wished that was him because the truth was, no matter how busy he was he could make time, he was interested in someone, and he was very interested in having sex.
Not that he admitted to that, fuck no. He had gotten better at expressing himself and his emotions over the last three years but that didn’t mean any of that was anyone’s business. He still only gave a mild snarl when Raccoon Eyes leaned in, only too happy, to ask if he had ever done it. Like she was so superior when she couldn’t even say the fucking word.
He wasn’t the only virgin in class, far from it, but still he was somehow shocked when Deku admitted that he had never had sex either. He shouldn’t have been; Deku worked just as hard as him and had even less free time than Katsuki did, since he was busy meeting with All Might as well as visiting Auntie as much as he could. Logically, it would only make sense that the nerd was in the same boat as him.
Except it…didn’t, because there was just no way that no one had ever been interested in Deku over their three years at U.A. Not with those chubby cheeks and the wide eyes and those fucking freckles that he could never stop thinking about all his life, even when it made him unspeakably angry.
It just wasn’t possible that no one was interested in him. He had thought Round Face, at first, until she had come out at the beginning of their third year and started dating her girlfriend. Then Half-and-Half, because anyone with eyes could see the way he looked at Deku like he hung the moon, but apparently he and Baldie were making it work long-distance, so that ruled that out.
Those were the only two that he could think obviously had a crush on the damn nerd at some point, but surely there must be others. Sure, Deku was a self-sacrificing creep who asked a few too many personal questions and who could barely take care of himself without Katsuki literally harassing him into it but…but he was also kind. Kind, and giving, and forgiving and so, so fucking loyal, probably more than anyone deserved. He had a smile like the goddamn sun and surely he hadn’t been the only one to notice its shine.
But that was the fucking problem, wasn’t it? Now that they had worked out their shit and Katsuki had finally grown the balls to apologize and mean it, he had actually started to shine a light on all those rough and dusty feelings he had been shoving in a cage behind his heart for years. Had finally realized what that jump of adrenaline he got whenever he caught sight of Deku meant, and fuck if it didn’t make everything more complicated.
So yeah, he was shocked that the nerd hadn’t had someone jump his bones yet, but he knew it was probably a combination of his unrelenting determination to be a hero and being too anxious to make or receive any advances that kept him as untouched as Katsuki.
Not that Katsuki was anxious about it. Fuck off.
That still didn’t really explain how he ended up here, sitting on one end of his bed with Deku on the other, both looking and avoiding each other's eyes as they worked up the courage to get naked.
They’d seen each other naked, of course, but a passing glance in the locker room showers and taking off their clothes to…to touch each other were two different things.
Fuck. He felt like a protagonist in a shitty coming-of-age flick, blushing and fidgeting and so fucking nervous that his fingers were starting to tingle. It was just Deku, after all. Deku, who he’d taken baths beside as children and who wouldn’t potty train without holding his hand. Deku, who he’s seen wet the bed more than once and who he’d seen eat shit multiple times when he wasn’t quite used to Full Cowling.
But this was also Deku. Deku, who smiled like sunshine after a storm and who still called him that stupid nickname that made his stomach flip. Deku who used to tell him silly stories when he couldn’t sleep and who always had a spare pencil whenever Katsuki melted his own in school, even when he was being a little shit and never bothered to thank him for it.
Deku, who had thighs as thick as Katsuki’s head and a fat ass straight from the gods and oh fuck, he was about to see all that tanned, freckled skin up close and uncovered.
He might pass out. How embarrassing would that be?
But Deku had come to him after the party downstairs ended, which was nothing unusual since they had long since figured out that they slept better together than apart, but it was different tonight. Tonight, with both of them still a little tipsy and the scandalous admissions still ringing in their ears, had Deku stuttering out a question that had them both blushing from head to toe but settling on the bed all the same, with the door firmly locked and the lights low enough to shadow but still see.
He guesses that unspoken feelings aside, if he was going to do this with anyone he would want it to be with Deku. He trusted Deku with everything in him and the nerd felt the same way. He had told him so somewhere in that mutter-storm that led them here.
He was breathing heavily. Heavier than he usually did but he couldn’t seem to stop, watching the way Deku’s fingers twitched toward the hem of his shirt before going back to fisting Katsuki’s comforter. A muted cheer rang up from the other side of the wall, likely his band of idiots drunkenly playing Mario Kart, but all his attention was on Deku. The words started pouring out before he could stop them.
“I can…do you want me to…”
Deku let out a little “Eep!” that had no reason to be as cute as it was when he started talking, eyes darting up from where they were staring down at his covers. He took a plump lip between his teeth, and Katsuki stared at it for way too long before he realized Deku was nodding and granting him permission.
Fuck. Okay. They were doing this.
He reached out with hands that did not shake, fuck you very much, until he was gripping the hem of Deku’s stupid ‘Sleep Shirt’ t-shirt. He helpfully raised his arms as Katsuki dragged it upwards, watching intently as every inch of muscle was revealed. Deku’s chest was dotted in freckles and more than a few scars but this, still, was a picture he was used to. Not only did they share a locker room at UA and at Miruko’s agency for work-study, but Deku also had a nasty habit of shredding his shirt whenever he used more of One for All than he should’ve.
He looked his fill even though it was a familiar sight, and was only shaken out of his trance when he felt cold fingers brushing his abdomen. Deku shot him an apologetic look when he jumped but tugged at his tank top in question. Katsuki’s throat was drier than a desert so he could only nod, and soon enough they were both sitting shirtless.
Again, nothing new. His sweat was literally chemical so he often worked out without a shirt when the activity permitted it, so it wasn’t anything the nerd hadn’t seen before. Still, his eyes were roaming over Katsuki’s shoulders, dipping down to his abs before rolling back up to his pecs. Embarrassingly enough, he felt his nipples harden under Deku’s gaze and could only watch as he took his bottom lip between his teeth again.
Fuck. There was no way he was making it out of this encounter with his dignity intact.
They had both dressed for sleep, leaving them in a pair of sweats and shorts respectively, and he was self-aware enough to admit that his hands were trembling this time as he reached for Deku’s waistband. His fingers had barely brushed it before he was looking up, asking for silent permission to cross a line that they would never be able to uncross.
He took in a slow breath through his nose, looking down at Katsuki’s hovering hand, and he nodded.
He felt the elastic of Deku’s underwear under his finger and hesitated, for a second, before gripping that to pull down as well. There was such a thing as too slow and he knew he would lose his nerve if he had to undress the nerd again after this. Deku leaned back to lift his hips from the bed, letting his weight rest on his hands, and Katsuki pointedly did not stare at the crux of his thighs. He tugged his shorts and his (criminally short) boxer briefs down until he was tugging them off the nerd’s ankles. He let Deku’s legs settle back on the bed and gathered every bit of courage left in his body.
He looked up.
Someone gasped, and he wasn’t quite sure who it was. All he could think about, all he could see was the dark thatch of hair between Deku’s legs, green and curly just like the hair on his head. His throat clicked as he swallowed, roving his eyes down over…over…
Fuck, how could a cock be so pretty?
That really was the only way he could describe it. Deku’s cock was short and thick, sitting half-hard just from pure anticipation against his thigh. He had never bought into that whole ‘big dick=better sex’ bullshit that everyone seemed to spout because Deku’s cock was…perfect. It was perfect and he had to resist the sudden overwhelming urge to wrap a hand around it and stroke it until it was fully hard, to crawl off the bed to his knees to see if he could fit his lips around it.
“Kacchan…” Deku whined, there was no other way to put it, and he suddenly realized he had probably just been sitting there and staring at Deku’s dick for longer than was appropriate.
Not that anything about this situation was appropriate, fucking hell.
He coughed suddenly, dragging his eyes back up to Deku’s face. He was as red as ever, pupils blown wide even as his lip trembled in embarrassment. “Sorry.” He muttered under his breath, barely able to catch it when Deku gave a shaky smile in return. Slowly, as if afraid to scare a wild animal, he sat forward and inched his hands toward Katsuki’s pants.
He held his breath, abs drawn tight as cold, crooked fingers slipped under his waistband. Deku had always had cold hands, when they were kids but even more so now after all the breaks and surgeries. He had complained about his cold fingers the first few times they had slept together but then he saw the way the nerd’s hands shook on cold or rainy days, how he would sometimes drop his pen when a spasm hit him during class, and never said a word after that.
There was nothing like the feeling of his pants and boxers sliding down his legs to rip him out of his melancholy thoughts though.
He swallowed again when his dick immediately sprang up to slap against his stomach, now reclined in the same position Deku had been before so the nerd could look his fill.
He wasn't as thick as Deku but he was longer, and he had never been insecure about his dick but fuck if Deku's gaze was suddenly making him question if he was defective or something. He knew, logically, that he was only doing the same thing Katsuki had done before, taking in a view he had never been blessed with. It didn't stop him from being a bit embarrassed that he was already fully hard, but another glance told him that Deku was nearly in the same boat so he didn't stress about it.
It looked like they had reached an impasse again, with both of them naked but too afraid to touch, and even through his annoyance he still didn't move. This was so stupid, so fucking stupid. Why was he hesitating now? They were both naked and obviously into this so what was the big fucking deal?
The big deal was that he was about to fuck his childhood friend. The guy he had, if their mothers were to be believed, watched being born with all the presentness of a three-month-old.
The guy he was pretty sure he was in love with.
Fuck, he was going to regret this, wasn’t he? Not the act itself, god no; even if it turned out terrible because they had no idea what they were doing, he knew he wouldn’t regret it. But when Deku inevitably awkwardly thanked him and moved on with his life, leaving Katsuki behind with nothing but memories and a shattered heart, well…he might hate himself a bit for agreeing to it in the first place.
He didn’t realize he had been lost in thought until Deku’s hand was on his knee, those watery green eyes taking on that familiar cast of worry that he had seen directed at him so much. He used to think it was pity; that the nerd was looking down on him because he was weak, but now he knew better. Now he knew that Deku looked at him like that because he cared.
“We…we don’t have to do this if you don’t want to, Kacchan. It’s okay to change your mind.” Deku gave him a wobbly smile and he knew down to his bones that he was completely serious. He knew he would never force him into anything. His throat itched at the thought.
Gods, he didn’t deserve him.
“I want to. If you still want to.” He said, voice like broken glass. Deku nodded at him shyly, putting his other hand on Katsuki’s other knee and only hesitating for a second before leaning in. Katsuki let his eyes go half-lidded, let the moment and movement consume him, and leaned forward to connect his lips with Deku’s.
His first thought was that Deku’s lips were chapped, and his second thought was about how he couldn’t care less. Deku’s lips could be cracked and bloody and covered in dust and Katsuki would still be hungry for them. Nothing in the world could stop him from bringing a hand up to bury into the nerd’s hair, raking his fingers through bouncy curls like he had wanted to do for years. Deku let out a soft gasp, right into his mouth, and one of his hands came up to hold Katsuki’s cheek, unbearably tender.
He wasn’t making it out of this alive.
It escalated quickly, obviously, since they were both virgins and still teenagers and hormones guided them when the nerves started drifting away. Before he knew it Deku had climbed into his lap, sitting that fat ass almost on top of his dick and he couldn’t help the moan he let out at the friction. Deku swallowed it whole, rocking against him with a needy whine.
There was a voice drifting around in the back of his head, whispering something about foreplay and moving too fast but it was only too easy to ignore it once he finally grabbed a handful of cheek, groaning as it almost spilled through his hands.
It didn’t take long for Deku’s own hands to wander, skimming down his arms and squeezing his muscles before roaming back up to his pecs. His mouth curled into a smirk; he had seen the stares that Deku had tried so hard to hide in the locker room. He knew his pecs were bigger than most guys and the nerd seemed almost as obsessed with them as Katsuki was with his ass. He figured it only fair that Deku got his share of cupping and squeezing in return.
Rough palms skated across his nipples and he moaned again, higher and softer than last time, and he felt his ears burn. He didn’t understand what he was so embarrassed about, the nerd was making the same noises as him!
Maybe this whole thing was going to be embarrassing and he just had to get used to it.
Deku followed his moan like a verbal direction, pinching his nipples between his fingers. Katsuki hissed a bit and Deku jolted slightly, pinching them a bit softer and relaxing when Katsuki rocked his hips in appreciation. He finally disconnected their mouths only to kiss down his jaw, not hesitating to suck a row of dark bruises into the soft skin of his neck.
A part of him was worried that people would see all the bruises he left on Deku. A part of him was smugly satisfied that they would.
Deku didn’t seem to have any complaints, taking one hand away from his nipple (and he didn’t miss it, fuck off) to grip Katsuki’s hair, rolling his head back to give him more real estate. A burst of loud chatter sounded from the wall next to him and Deku bit his lip, trying to quiet all the beautiful noises leaving his mouth.
“Don’t,” Katsuki groaned into his neck. “I wanna hear you.”
“But they’ll hear us Kacchan!” Deku’s concern was betrayed by the way he rolled his hips, as if the thought of them being overheard got him a bit more excited than it should’ve. Katsuki tucked a grin into the nerd’s neck, kissing up his ear to whisper right into it.
“I don’t care. Let them hear how good I’m making you feel.”
“Fuck.” It came out in a quiet wheeze, and he’s not ashamed to admit that his dick twitched when he heard Deku curse. It was hotter than it had any right to be and he sunk his teeth into the skin below the nerd’s ear as a reward.
Deku jolted this time, mouth dropping on the sluttiest “Ah!” he’d ever heard, and louder than any sound he had made before. He pointed half an ear at the way noise behind the wall quieted down, and he knew he was a bit drunker than he initially thought because the thought of their friends listening to them fuck only served to make him hornier.
“That’s right, baby.” He said, a little louder than he should’ve, and he wound his hand back to give Deku’s ass a sharp smack before he could think better of it.
“Kacchan!” He yelped, half approving and half scolding, but Katsuki only soothed the red spot over with his hand, pressing soft kisses to his jaw in apology. Deku sighed, wrapping both arms around his neck and burying his face in the spot between his ear and shoulder. He felt more than heard the mumble against his skin, and he urged Deku to speak up.
He squirmed in his lap at the request, scooting close until they were practically melding together. He only pulled his head away far enough to move his mouth to Katsuki’s ear.
“Again, please.”
And his voice was so small and soft and polite that he couldn’t help the filthy groan from leaving his mouth. Here was his precious Deku, asking so politely for Katsuki to spank him again.
He wouldn’t be disappointing him.
He drew his other hand back and slapped it down, colliding with Deku’s untouched cheek with a sound that was drowned out by his moan. Fuck, he sounded like a pornstar. Katsuki couldn’t get enough and he did it again, quick and sharp right after the last, and Deku squealed in his lap, hips jumping to hump his cock against the hard planes of Katsuki’s stomach.
“Kacchan,” He whimpered, still buried in his neck like he would find treasure there. “Please.”
He didn’t elaborate so Katsuki couldn’t help but goad him. “Please what, baby?” The endearment slipped out again without any consent from him but he ignored it, focusing on rubbing circles on Deku’s cheeks, looking down and smiling at how they were just a bit red from the spanking. He pushed away a few nasty fantasies of tugging Deku off his lap and bending him over it, laying into his ass until he was crying and begging for more.
Thoughts for later. Right now, he needed to focus on the sweet thing whispering in his ear.
“P-please,” He stuttered a bit but pushed on. “Please fuck me.”
And all the bravado he had before blew away with the wind. He knew, somewhere in the back of his mind, that sex is what all of this was leading to but it was only too easy to get lost in the moment. He got so lost in kissing and touching and exploring Deku that he forgot what the end goal was here.
They were gonna fuck. And if Deku’s phrasing was on purpose…
“You,” He swallowed, trying to drive away his suddenly dry mouth. “You want me to fuck you?”
Deku nodded shyly, still hidden in his neck and refusing to meet his eyes. Katsuki, absurdly, found himself nodding along with him. He thought about the bed under him and the little half-empty bottle in his bedside drawer and had to stop his hands from shaking.
For some reason, it didn’t sink in until now how real this was. He was gonna turn Deku on his back (or his front, or whatever way he wants or whichever is more comfortable) and finger him, and then he was going to fuck him. He was going to fuck Deku. His cock would be in Deku’s ass in short order and for fuck’s sake, is he rambling in his own goddamn head?
Ridiculous.
“How do you want to…?” He didn’t let himself keep overthinking; he made a plan and now he was following it and it was as simple as that. Deku finally pulled back from his neck, leaving a damp spot behind from where his body heat used to be and drummed his fingers across Katsuki’s shoulders in thought.
“On my back.” He eventually said. “I want to see you.”
Gods.
He nodded again, letting Deku shuffle off of him and onto the pillows, opening his second drawer as the nerd got comfortable in his bed. His bed. Fuck. They were going to have sex in his bed.
He cleared his throat, metaphorically beating back his nerves with a baseball bat, and grabbed the bottle of lube. His fingers brushed a box and he hesitated, weighing the decision in his mind before looking back up. Deku was reclined on his pillows, legs drawn up tight against his body as if he hadn’t been naked and squirming in Katsuki’s lap only a minute before, and he took a mental picture before asking.
“Do you want me to use a condom?”
Technically they didn’t need to; neither of them could get pregnant and they obviously didn’t have any STIs, but better to ask the person who was getting fucked.
“I...I don’t mind doing it raw.” Saliva flooded his mouth when the words ‘doing it raw’ fell from that innocent mouth. “A-as long as you don’t! It’s your bed and it’ll probably be, uh, messy if we don’t use one…” Deku trailed off and Katsuki spoke up before he could lose himself in muttering again, barely having to think of his response.
“I can wash my sheets tomorrow.”
He bit his lip before giving Katsuki another shy grin, and he left the (unopened) box of condoms behind.
He reminded himself that he actually knew what he was doing for this part as he sat back down. No, he’d never fingered anyone else but he wasn’t a stranger to it himself, and he had done copious amounts of research before he ever stuck any fingers up his own ass, so he wasn’t worried about doing it wrong.
It’s just…there was a difference between doing it to yourself and doing it to someone else, and he knew if he thought about it too long he might chicken out.
“Spread your legs.” He ended up saying, and he cringed at how much it sounded like an order. He didn’t mean for it to come out that way but fuck, he couldn’t dredge up any extra manners while he was focusing on blowing Deku’s mind. Deku didn’t take offense; he never did since he was long used to Katsuki’s rough demeanor, but he did look away when he slowly parted his legs, giving Katsuki a front-row seat to a sight that he knew he’d never get tired of.
He rubbed his hands up Deku’s thighs in what he hoped was a comforting manner but he couldn’t manage to draw his eyes away from the feast in front of him. His cock was quickly becoming a familiar sight, drooling precome in the dip of his hip, and tracked his eyes down over Deku’s cute, plump balls (was everything about this fucker adorable?) until they rested on his tiny pink hole.
He hadn’t even realized his hands were following his eyes until the pad of his index finger was brushing dry over the tight hole.
Deku’s legs jumped and he clamped a hand over his mouth to stifle the noise he made when Katsuki touched the most intimate part of him. Katuki licked his lips, watching the way those freckled legs shook just when rubbed his finger across Deku’s hole. Fuck, if he was this responsive when he wasn’t even doing anything, then how would he be when…?
“Kacchan.” He mewled, looking up at him with desperate eyes, and Katsuki reluctantly tore his hand away to fumble for the lube, popping the cap and putting more than was probably necessary over three fingers. Better to be safe than sorry.
He went back to his soft brushing motions from before, now aided with the glide of lube on his fingers, and kept up the gentle rubbing until Deku relaxed a bit, allowing the tip of one finger to slip inside. Looks like he wasn't the only one who did his research; unless Deku had experience doing this to himself like Katsuki did.
Better to push that mental image back before he came without his cock even touching the nerd.
Opening him up went by quickly, or maybe he was just too caught up in watching Deku’s reactions to notice when he made it up to three fingers. Deku looked like a dream when he was being fingered, head tipped back on the pillows and mouth hanging open, no barrier to stop all the delicious noises he was making. Katsuki resisted the urge to palm himself with his free hand; this would be over way too quickly if he started touching himself with Deku looking and sounding like that.
It wasn’t until he had almost deemed Deku ready that he found it.
He honestly wasn’t looking for it. He might be an arrogant person but he had no illusions of prowess in this area of life. It was unlikely that he'd be able to find Deku’s prostate since this was their first time and he had never managed to find it with himself. He was just focusing on stretching him out when he scissored his fingers and Deku’s hips jumped off the bed like he’d been electrocuted.
At first, he thought he’d hurt him, but all his worries fell away when he looked up and caught sight of Deku with his head thrown back and his eyes screwed shut, gripping the sheets beside his head hard enough that he heard a small rip. Not that he could give a single fuck about that right now when he managed to hit that spot again and Deku nearly screamed.
“Ka-ah!-cchan! Put it…put it…I’m gonna…please!”
"Fuck." He almost choked on his spit, taking his fingers out a bit too quickly if the way that Deku whined was any indication. He used his clean hand to rub aimless circles on his thigh in reassurance as he used the other, still wet with lube, to slick his own cock.
He positioned himself at Deku's entrance, and suddenly it was like everything paused.
All the blood rushing in his ears suddenly went quiet, and he could hear the piercing silence that they had been previously filling lay heavily on them like a blanket. This room, the space they were in, felt like a universe in itself. His throat was suddenly bone dry as he tracked his eyes up Deku's perfectly imperfect body to stare into his eyes.
"Are you sure?" He asked, no bullshit, no posturing now. There wouldn't be any going back after this.
Deku didn't hesitate. "Take me, Kacchan."
He leaned down, sealing their lips together once again before he slowly started pushing in.
Deku's lips opened on a gasp that Katsuki swallowed, sliding his tongue in hot around the nerd's own to distract him. Thick legs curled around his waist, digging in heavy as Katsuki forced himself to keep his steady pace as the sensation overwhelmed him.
There was nothing to compare it to, no way to describe it or make vague metaphors. He felt his own eyes roll back and slip shut as Deku consumed him.
He rested his head on the nerd's neck, rising with each measured inhale as Deku got used to the invasion in his body. He had a high pain tolerance but Katsuki knew his tells; thankfully, it looked like he was just trying to adjust for now.
He couldn't tell you how long they lay there, united and still, breathing into the little pocket of heaven they had created, before a crooked hand was winding into his hair and a voice was whispering in his ear.
"Move."
He didn't need to tell him twice.
His first pull out felt like pure fucking sin. It felt like the moment he tipped over the edge when he was palming himself at night, shirt hem stuffed between his teeth and free hand tweaking his nipple, and he exercised every bit of his hard-won self-control to keep himself from coming on the first thrust. He would never forgive himself if he let it end this quickly.
He pushed back in slowly, distracting himself from the encompassing pleasure by sucking another hickey onto Deku’s neck, listening to the whine in his ear.
“Oh god...” It didn’t seem like the nerd was faring any better than him, at least, so he took that as encouragement. It wasn’t like either of them was actually going to last long anyway, but he had to make Deku cum first. Whether it was pride or just etiquette didn’t matter; Deku was going to cum so hard he cried and Katsuki was going to make sure of it.
(Not like making the nerd cry was hard, but still.)
He kept the pace easy for a while, letting both of them grow used to the intense sensations so this wasn’t over with too quickly. He was hyper-aware of every movement and noise Deku made, reading them like a roadmap to show him what made his partner feel good. Deku, for his part, seemed to be good at returning the gestures without even trying, scratching his nails down Katsuki’s back and making him shiver, moaning in his ear and making him bite his own lip to keep from mindlessly rutting into the gorgeous man under him.
“Faster.” Deku suddenly begged, and he could’ve thanked every god in the world, but he settled for snapping his hips in quicker.
“Kacchan, oh, oh fuck-” This wasn’t happening. This was not happening. Katsuki was having a very vivid, very visceral wet dream or he was fucking dead, in the afterlife and living all of his goddamn dreams because nothing else could explain the way Deku whimpered under him like Katsuki was giving him everything he ever wanted.
He didn’t realize his own mouth was hanging open, making way for his own moans and pants, until a string of drool almost dripped onto Deku’s collarbone. He was quick to wipe it away, not that he thought Deku would even notice. He had his eyes screwed shut, biting furiously on his lower lip as his hand scrabbled at Katsuki’s back, the other fisted in the sheets by his head.
Once he settled into the new rhythm, he moved one of his hands from the bedspread to hook under the nerd’s knee, pushing it up and closer to his chest. He didn’t push too far, but he was familiar with how flexible Deku was from training so he knew what he could take. It didn’t hurt him; the opposite actually, since as soon as he hit a new angle the nerd was arching his back, calling out with a shrill “Kacchan!” as Katsuki managed to hit his prostate. He kept the angle as best he could, thrusting in hard enough that the bed was rattling with the force of it, knocking into the wall and definitely broadcasting what they were doing to anyone who was still up. He couldn’t bring himself to care.
His stomach started to tighten and he knew they were approaching the finish line fast. He kept the pace as he slung Deku’s leg over his shoulder, leaning down slowly so Deku could stop him if it hurt too much, before attaching his mouth to the nerd’s neck again and wrapping a hand around that thick cock he had been thinking about all evening.
Two, three strokes before- “Kacchan! Yes! Yes!” and he bit down on his biggest hickey.
The nerd practically sent them into the air with the way his body jolted, head slamming back into Katsuki’s pillows as he screamed. That might’ve been a bit of an exaggeration but Katsuki didn’t care, the wanton sound of Deku’s pleasure and the feeling of his hole clenching around him sending him careening into his own orgasm.
Cum spurted messily around his hand as he fucked Deku through both of their orgasms, high-pitched “Ah, ah, ah”’s echoing in his ear as he rode the wave of ecstasy. It took a few more jerks of his hips before he was finally spent.
The silence seemed to buzz as they both finally went quiet, just breathing heavily in the aftermath of the best sex they’ve ever had. (Only sex they’ve ever had but…details.) He was still inside Deku, and the nerd was still wrapped around him, but he couldn’t bring himself to move other than to let Deku’s leg down gently from his shoulder. The nerd didn’t seem to want to move either, slithering his arms and legs around Katsuki until he rested his full (not insignificant) bodyweight onto him. He didn’t worry that much about it though. He could take it.
They let the silence stretch, and just before Katsuki was about to break it with some inane comment or question a round of whistles and applause kicked up from the other side of the wall. Katsuki prayed, prayed they were towards the game, until-
“Hell yeah, Bakubabe! Not a virgin anymore!”
He groaned, full of annoyance and devoid of lust like his earlier ones, and held back a chuckle at the embarrassed squeak Deku let out. He wasn’t in the prime position to shove his face into Katsuki’s neck but he somehow managed it. He knew he’d be getting so much shit tomorrow about this, they both would, but he was way too tired and satisfied to care.
Eventually he found the energy to pull away and out of the nerd, noting the full-body shiver when he eased his cock out of that impossibly tight hole. He was lazy with moving his eyes away and treated to the sight of his cum slowly oozing out. It should probably be gross but he felt strangely smug at the sight.
He’d kick himself about the state of sheets tomorrow but for now he just collapsed next to the nerd, catching his breath with one arm tucked behind his head. He was half dozing when Deku finally spoke up.
“Kacchan?”
He hummed, not bothering to open his eyes where they had slipped closed.
“Can I…stay?”
That got him looking. It wouldn't be the first time they had shared a bed, granted no other times were quite like this, but something about the nerd’s voice had him looking closer before answering. Deku wouldn’t meet his eyes, hands twisting in the rumpled covers underneath him, until he evidently felt the eyes on him and looked up, locking gazes with Katsuki in the dark.
He was asking more than he was saying. At least, Katsuki hoped he was.
He sat up, yanking the comfort out and laying it over them both. Deku barely had time to make a confused noise before he was laying a heavy arm on his waist, pulling him close until they pressed sticky together. He tried not to inject too much hope into his voice as he replied.
“You better.”