Work Text:
“Hey, Kacchan?”
“Yeah, nerd, what’s up?”
“Have you ever had sex?”
A beat. A sharp intake of breath.
“The fuck, Izuku?”
Katsuki looked up from the paragraph he was in the middle of reading, staring at Izuku as if he had three - no four - heads. The nerd had the temerity to look ashamed, cheeks flushed red and lip trembling slightly. With a sigh, Katsuki sat up, the rickety bed creaking with effort as he threw his legs over the edge and leaned closer to Izuku. Izuku, for some fucking reason, leaned backwards, as if trying to put as much space between him and Katsuki as possible.
“Oh no,” Katsuki stated, reaching out and grabbing Izuku’s wrist. “You’re not getting away that easy.”
“Kacchan,” Izuku whined, using his free hand to cover his face.
All Katsuki could do was shake his head, loosening his grip from around Izuku’s wrist, though still keeping it firm enough so that Izuku couldn’t squirm his way free.
The two were hanging out at Izuku’s run-down university apartment in downtown Tokyo, chilling out in Izuku’s room as they each did their own thing in silence. Izuku was supposed to be writing a paper, his laptop open on a document that was scattered with educational jargon - like pedagogy - that Katsuki didn’t even want to try and understand. Katsuki, on the other hand, was using his free time to try read a book for once; try was the keyword, though, because no matter how hard he tried to focus, his eyes kept roaming towards Izuku, staring as the nerd tried to work through his millionth essay of the week.
“Okay, nerd, spill,” Katsuki stated, giving Izuku’s wrist a tentative squeeze. “What’s with the odd question?”
“I just - you know -” Izuku attempted to explain, now waving his free hand about as if he could magic up the answer. He refused to meet Katsuki’s eyes, though the older boy didn’t really seem to blame him.
“Did someone… say something to you?” Katsuki asked, finally releasing Izuku so he could lean his elbows on his knees.
“No,” murmured Izuku, who was now biting his lip. “But, you know, people talk, and well - you know - I was just wondering if Kacchan had - um - had sex yet?”
Katsuki sighed again, running a hand down his face as the nerd wriggled nervously in his seat. Why the hell would Izuku be thinking about sex? Particularly the nonexistent sex that Katsuki was definitely not having.
Sure, there had been moments - a sloppy make out session here or there- but that was it really. There wasn’t really anyone he felt the need to go all the way with. But, hell, now that he was thinking about it… had Izuku had sex yet?
“Why do you even want to know, Izuku?” Katsuki asked, shaking his head with a frown.
“I don’t know,” Izuku answered, finally closing his laptop and turning to face Katsuki. His face was still as red as a tomato, and he was still trembling like a leaf, but at least he had the guts to look Katsuki in the eye. “I mean, I never - what’s to say is that - well, I’m not exactly experienced.”
“So you’re a virgin?” Katsuki summarized, causing Izuku to let out a small squeak. With a roll of his eyes, he continued, “Relax, Izuku, I’m not judging you or anything. Plenty of people our age haven’t had sex yet, it’s fine.”
“Okay, sure, but have you? ” Izuku asked again, this time his voice sounding more confident than when he started.
“Nah,” Katsuki replied, making his way back onto the bed. He picked up his book and leaned against the pillow, hoping that Izuku would just let the conversation die a fiery death.
No such luck.
“You haven’t?” Izuku asked, cocking his head to the side. “But! Kacchan is so - so popular! And - well - handsome?”
“Sure, I guess,” Katsuki groaned, letting his book drop back on the bed with a thud. “People aren’t exactly clamoring to get in my pants though. Or if they are, I ain’t letting them.”
“How come?”
“Shit, Izuku, I dunno,” Katsuki replied, shooting the younger boy an annoyed look. “Just never really wanted to with any random extra, y’know?”
Izuku frowned, scratching the back of his neck thoughtfully. “Yeah… I guess so.”
“Great, so question answered,” Katsuki replied, patting the bed with his hand to hopefully get back to reading.
However, Izuku didn’t seem to be done.
“Want to have sex with me?”
Katsuki froze, whole body tense as Izuku’s words echoed in his mind. Sex? With Izuku?
Izuku must have thought that Katsuki’s rigid reaction signaled the blonde’s discomfort, for suddenly he was yammering, “Oh my gosh! I’m sorry, Kacchan! I don’t know what came over me! We were talking, and neither of us had sex, and you’re my best friend, and I trust you and - I don’t know! I’m sorry, Kacchan, I’m -”
“Shut the fuck up, nerd,” Katsuki growled, finally sitting back up so that the bed groaned in response. “Just - just let me think for a second, okay?”
“Um, sure, Kacchan,” Izuku replied, wringing his hands nervously.
As Izuku simmered in anxiety, Katsuki thought.
The nerd’s proposal was… odd, to be sure, but it wasn’t totally out there, was it? Yeah, Katsuki and Izuku were best friends, their relationship coming a long way from what it had been when they were youngsters running around outside with scraped knees. They trusted each other, and had each other’s backs. Katsuki knew Izuku’s mind, and Izuku knew Katsuki’s.
And, yeah, okay, there was a casual intimacy about them that the rest of their friends didn’t super understand. A hand resting on the small of Izuku’s back as Katsuki guided him through a crowd. Izuku massaging Katsuki’s palms after a long day of using his quirk. Katsuki tucking a rogue piece of curly green hair behind Izuku’s ear if it fell in his face. Curling up against each other in bed when the nightmares refused to leave. Their fingers intertwined as they walked down the street because letting go still caused their hearts to race.
So, no, it wasn’t a totally bad idea. Out there? Sure. But Katsuki trusted Izuku with his life, with his fucking heart, so…
“Yeah, okay, Izuku,” Katsuki answered finally, grabbing the book off the bed and tossing it on Izuku’s desk. He’ll try and find a different day to read, he guessed.
“Okay?” Izuku squawked, sitting up straight in his chair.
“Yeah, okay,” Katsuki repeated, moving to the edge of the bed once more and patting the seat beside him. “So get over here.”
“But, Kacchan,” Izuku exclaimed, rooted in place. “Why?”
Katsuki raised his eyebrow. “You’re asking why?”
“Yes, why?”
“Well,” Katsuki thought, looking up at the ceiling so he wouldn’t have to look at Izuku as he spoke. “You asked, and since there’s really no one else I would trust with something like this… yeah, why not?”
“Oh.” Izuku’s voice sounded small, genuine. “Thank you for trusting me, Kacchan.”
“Just get over here,” Katsuki growled, hand shooting out and grabbing Izuku’s forearm so he could yank Izuku towards the bed.
Izuku yelped, but let Katsuki manhandle him onto the bed so that they were sitting side by side, thighs touching, knees knocking together. It was - in a word - awkward.
“Um,” Izuku stated intelligently, glancing over at Katsuki. “Now what?”
“Fuck if I know,” Katsuki snorted, nudging Izuku’s shoulder with his own. “I’ve never done this either, remember?”
“Right,” Izuku replied, brows furrowed as he thought. “Well, I guess, there’s - um - foreplay? Is that it? When two people get into it and -”
“Why don’t we start with kissing?” Katsuki suggested, interrupting Izuku before he could go full muttering.
“Oh, right! Kissing! Right!”
“... You have kissed someone before, right?”
There was that blush again. “ Um, I kissed Todoroki in third year?”
“What!” Katsuki all but yelled, causing Izuku to jump in his seat. “When? Why?!”
“We were both curious!” Izuku exclaimed, shaking his head so that his curls bounced. “It was more like a peck on the lips! It was tame.”
Katsuki crossed his arms. “Hmph.”
Izuku leaned into him, his eyes now twinkling with mischief. “Have you ever kissed anyone, Kacchan?”
“Duh,” Katsuki replied. “I’m not completely inexperienced, you know.”
“Sure,” Izuku agreed, the corners of his lips twitching in amusement. “Who?”
“Kirishima, Kaminari, Monoma -”
“Monama?!” Izuku screeched.
“Now who’s jealous,” Katsuki teased, poking Izuku’s ribs good naturedly.
“I’m not jealous!” Izuku replied, shaking his head again. “I’m just shocked!”
“Eh, it was more of an experimental thing,” Katsuki said with a wave of his hand. “We were bored and horny and -”
“I don’t need to know, thank you,” the younger boy replied, the red flush now traveling down his neck.
“Hey.” Katsuki took Izuku’s hands in his, giving them a reassuring squeeze so that Izuku would look at him. “We don’t need to do this, but if we do, we need to communicate, right?”
“Yeah,” Izuku replied, worrying his bottom lip with his teeth. “I’m nervous, that’s all.”
“Me too,” Katsuki admitted, thumbs tracing soothing circles into Izuku’s palms. “But, uh, I would like to kiss you, if you’re willing to try.”
“Yeah, Kacchan, I’m willing to try,” Izuku stated, giving Katsuki a small smile.
His heart fluttered in his chest, like a tiny butterfly wing. Ugh, how cliche, he thought, as he leaned closer to Izuku, eyes flitting shut so that he couldn’t see Izuku’s face coming closer.
The first brush of their lips was tentative, questioning. Nothing spectacular, if Katsuki was being honest, but when he peeked an eye open to look at Izuku, all he could see was the sign of contentment written on the other boy’s features. He dropped one of Izuku’s hands in favor of cupping the back of his head, pulling him closer so that he could slot their lips together more firmly so that he could feel Izuku’s sharp intake of breath.
Much better.
Their lips moved together awkwardly, like an experiment, like they were trying to get familiar with one another. And, yeah, they were learning about each other’s bodies in a new way, so sue Katsuki for trying to take it slow with the nerd even though he was getting dizzy in the head.
Then, suddenly, Izuku’s mouth parted, and Katsuki couldn’t help but flit his tongue out so that he licked the seam of Izuku’s lips. Izuku’s answering moan just spurred Katsuki on further, his tongue sliding further into Izuku’s mouth, running along his upper teeth, tasting the roof of his mouth. It was messy, uncoordinated, and fucking perfect.
Izuku’s hands were framing Katsuki’s face, calloused palms rough on his cheeks. Their tongues slid together, tasting each other, and Katsuki wasn’t sure who was moaning louder.
When they parted, there was a trail of saliva connecting their mouths together and if that wasn’t the hottest thing Katsuki had ever seen.
“Fuck,” he groaned, diving right back in.
Izuku met him with equal vigor, groaning as Katsuki practically devoured him.
Yeah, Katsuki’s kissed before, but never like this, never in a way that made him want to lose himself in the other person. He kissed Kirishima out of pure curiosity, Kaminari on a dare, and Monoma because they were bored and he just wanted to blow off some steam.
But kissing Izuku? Kissing Izuku was everything, cliches be damned.
Katsuki would have spent all day kissing Izuku, but all too soon the nerd was pulling away, his breath coming out in hot pants as he stared at Katsuki with wide, hungry eyes, pupils dilated.
“Why’d ya stop?” Katsuki asked, trying to pull Izuku back in, though the nerd resisted.
“Because I want more,” Izuku stated, licking his lips. His hands slid off Katsuki’s face, towards his neck and down his sides. His fingers trailed along his ribs, dancing along his waist.
When he reached the hem of Katsuki’s shirt, Katsuki got the idea. Without even saying anything, he yanked his shirt off over his head and threw it aside, letting it land who knows where. Izuku grinned, eyes raking over Katsuki’s body appreciatively.
“Now you, nerd,” Katsuki stated, tugging at the bottom of Izuku’s shirt.
“Okay, yeah,” Izuku replied, following Katsuki’s lead in removing his shirt and tossing it to the side.
Despite not doing hero work anymore, Izuku was still fit: broad shoulders, strong arms, toned stomach. Like Katsuki, he had an abundance of scars that Katsuki’s already catalogued and filed away in the back of his mind.
“You’re… really pretty, Kacchan,” Izuku murmured softly, hand reaching out so he could stroke the starburst scar on Katsuki’s chest.
“Yeah,” Katsuki replied, swallowing the lump in his throat, “so are you.”
Izuku gave him a lopsided grin. “Should we - um - get more comfortable?”
“Yeah, okay,” Katsuki agreed, scooting back on the bed so that he was laying down, his head resting on the pillows and Izuku between his legs.
They just breathed together, unsure of where to go from here. Though one thing’s for sure: Katsuki was hard, painfully, achingly hard. And based on the tent in Izuku’s shorts, so was he.
Unable to help himself, Katsuki reached between them, hand cupping Izuku’s straining erection so that he let out a low hiss.
“Feel good?” Katsuki asked, giving it a light squeeze so that Izuku groaned, arms straining so that he didn’t collapse on top of the blonde.
“Ye-yeah,” Izuku replied, rutting into Katsuki’s hand. “But there’s something I want to try, if you’ll let me?”
“Sure,” Katsuki agreed, pulling his hand away.
Izuku sat back on his haunches, hands going to the waistband of Katsuki’s sweatpants and giving him a questioning look. Understanding dawned on Katsuki - holy shit, Izuku wanted him naked - and he nodded in approval. He made quick work of removing Katsuki’s sweatpants and boxers, his dick - hard and leaking - springing free from its constraints. Katsuki fought not to cover himself up, not to turn away in shame as Izuku just stared at his cock, his pupils dilating even further.
“Wow, Kacchan,” Izuku said, wrapping a tentative hand around him. “You’re so big.”
And, for whatever damn reason, Katsuki laughed.
“What’s so funny!” Izuku cried, releasing Katsuki’s cock quickly.
“Nothing! Nothing!” he assured him, shaking his head. “I dunno, I guess I’m just - comfortable? If anyone else had said that, it would be weird.”
“But not me?” Izuku questioned, cocking his head to the side as he eyed Katsuki curiously.
“Not you,” Katsuki agreed. “I’m sorry if I made you uncomfortable.”
“You didn’t,” the younger boy assured him, giving Katsuki’s thigh a squeeze. “I was nervous I did something wrong.”
“You didn’t. Now, if you want to continue?”
Izuku’s face brightened. “Okay! You trust me?”
“Yeah, always.”
With a little hum, Izuku leaned forward and kissed Katsuki again, more confident as he explored Katsuki’s mouth. One of Katsuki’s hands found its way towards Izuku’s hair, fingers burying themselves in soft green curls. Izuku moaned as Katsuki’s nails scratched his scalp, lips trailing away from Katsuki’s mouth so they could map out the rest of Katsuki’s face.
Nose, each eyelid, forehead. He tongued along the scar adorning Katsuki’s right cheek so that Katsuki shivered.
Once he was done with Katsuki’s face, Izuku traveled further down, lapping at Katsuki’s neck, teeth grazing the sensitive skin of his throat. When Katsuki groaned, Izuku just chuckled, repeating the motion so that Katsuki squirmed beneath him.
“Damn, Izuku,” Katsuki murmured as Izuku now traversed even further down. “Sure you never did this before?”
Izuku glanced up from his spot by Katsuki’s chest, a mischievous grin on his face. “Nope! I’m just going by the noises Kacchan makes.”
“Well, shit, you’re a fast learner,” Katsuki replied, watching as Izuku nuzzled the spot between his pecs.
“Yep!” Izuku agreed before biting down on the spot above Katsuki’s right nipple.
Katsuki yelped, eyes widening with surprise as Izuku began to lap at his nipple. Shit, he was sensitive, and it seemed like Izuku picked up on that because he nipped and licked, causing Katsuki to moan loudly.
Once he was satisfied with the right nipple, Izuku moved to the left, giving it an equal amount of attention so that both were red and slick with saliva.
Finally, Izuku continued his way further down Katsuki’s body, mouth and hands mapping out every scar, every divot, leaving no piece of skin untouched. He nosed at the blonde hair that trailed from Katsuki’s stomach, stopping right before his cock.
“Izuku, I’m scared if you keep doing this, I might actually cum,” Katsuki panted, hips stuttering when Izuku nipped at the inside of his left thigh.
“Sorry, Kacchan, I can stop if you want.”
“Fuck, no, I just - I want this to be enjoyable for you too, that’s all!”
“I am enjoying this,” Izuku replied, thumb now rubbing soothing circles on Katsuki’s inner thigh. “I don’t really know what I’m doing, I meant it when I said I was just going by your noises, but all I know is that I’m really, really liking this so far. And if you’re enjoying yourself, then I’m glad.”
“Shit, I am, but this isn’t just about me,” Katsuki replied, hoisting himself up on his elbows so he could get a better look at Izuku.
The green haired boy already looked completely wrecked, and he’s not even the one completely naked right now. Maybe this was turning him on as much as it was Katsuki.
“Can I try one more thing?” Izuku asked. “If you say no, we can stop!”
“Go ahead,” Katsuki agreed, dropping himself back down on the pillows and staring up at the ceiling.
Suddenly, something hot and wet surrounded the head of his cock, causing Katsuki’s hips to buck up in surprise.
“Shit!” he yelled, lifting his head just in time to watch Izuku work his jaw open around the rest of Katsuki’s cock.
He wasn’t even sure if Izuku was doing this right, but it felt too good, and Izuku looked hot with his dick in his mouth.
Izuku’s eyes were screwed shut as he bobbed his head once, twice along Katsuki’s length. Katsuki tried to keep his hips still, anxious that if he moved Izuku might choke. Keeping as still as possible, he watched as Izuku pulled off hesitantly, a bit of precum stuck to the corner of his lips.
“Stop, stop,” Katsuki stated, trying to move away from Izuku.
“I’m sorry!” Izuku exclaimed automatically, sitting back up so that he could back away from Katsuki. “I didn’t mean to hurt you, or make you uncomfortable or -”
“No, no, babe, you didn’t make me uncomfortable,” Katsuki assured him, sitting up so that he and Izuku were face to face. “I just - if you kept doing that, I was going to blow my load down your throat, and I really don’t want to do that.”
“Oh,” Izuku replied with relief. “But - but that was the point, wasn’t it? I wanted to make you cum.”
“Have you given a blowjob before, Izuku?” Katsuki asked, though he already knew the answer.
“No.”
“Right, and I never got one. So, maybe it can be something we try later, okay?”
Izuku blinked, and Katsuki realized too late what he said. Whatever, it was in the open now, and he couldn’t help but chuckle at the wide grin that broke out on Izuku’s face.
“Okay, sure, Kacchan,” Izuku agreed, leaning forward to give him a quick peck on the lips.
“Great, now that that’s settled…. Now what?” Katsuki asked, all too aware of his naked body.
“Oh, um… Well, when I imagined this, I always thought that - that you would put it inside me,” Izuku claimed quietly, turning his head away so that Katsuki couldn’t see his eyes.
Katsuki was thankful, because he felt his face bloom pink at the admission. “Shit, babe, you really want to try that?”
“Yes,” Izuku admitted with a small shrug. “But only if you want to?”
“Izuku,” Katsuki said gently, taking Izuku’s hands in his. “Look at me.” When the nerd was finally looking at him, he continued, “Do you want this?”
“Yes,” Izuku repeated with a firm nod. “I want to try. With you.”
“Okay,” Katsuki said, “we need to switch places, and you also need to lose the shorts. I cannot be the only one with my dick out.”
Izuku laughed. “Okay, Kacchan.”
With some maneuvering, they were able to successfully switch places, Izuku now laying against the pillows. He and Katsuki removed his shorts and his boxers in one fell swoop, allowing Katsuki to finally get a look at Izuku’s thick cock.
One day, he hoped to get his mouth on it, but today was not that day.
“Lube and condoms?” he asked, grabbing one of the pillows by Izuku’s head so he could shove it under his hips.
“Top drawer of the nightstand,” Izuku replied, motioning off towards the side.
Katsuki yanked the drawer open and searched for what he needed. Once in his hand, he placed the half empty bottle of lube and a condom on the bed.
“Okay, so have you ever… fingered yourself?” Katsuki asked awkwardly, grabbing the lube and popping open the cap.
“Yeah,” Izuku replied, opening his legs up further. “Why do you think the lube is half empty?”
“Just makin’ sure,” Katsuki replied, coating his fingers with a generous amount of lube. “Get yourself in a comfortable position, okay? I know you said you’ve done this before to yourself, but I want to go slow.”
“Okay, Kacchan,” Izuku agreed, raising his right knee up and pulling it towards his chest.
“Good,” Katsuki praised, fingers trailing along the seam of Izuku’s ass. The younger man shivered at the praise, head lolling to the side as Katsuki eased himself into a more comfortable position between Izuku’s legs.
One hand spread Izuku’s ass cheeks open while the other teased his puckered hole, forefinger catching on the rim so that Izuku jolted.
“S-sorry,” Izuku whimpered, his thighs quivering in anticipation. “I’m just - I’m okay.”
“Don’t be sorry, baby,” Katsuki assured him, pressing his lips to the inside of Izuku’s knee. “I’ll go slow, okay?”
“Okay,” Izuku breathed; at that, Katsuki watched his body go lax, as if he put complete trust in Katsuki.
Shit.
With a deep breath, Katsuki slowly eased his finger inside, pumping it in and out until he had an easy rhythm for Izuku to adjust to.
“Talk to me, Izuku,” Katsuki gritted out, holding his finger still as Izuku’s heat tried to pull him in deeper.
“I’m okay!” Izuki gasped, wiggling his hips. “Just - just keep doing that, okay? Your fingers are a lot longer than mine.”
Katsuki nodded, giving Izuku a small hum as he did. He continued to ease his finger deeper, finally making it to the bottom knuckle.
Izuku let out a soft breath. “You can add another one, Kacchan. I’m ready.”
“Okay,” Katsuki whispered, pulling his finger out so he could add more lube directly onto Izuku’s asshole.
Izuku whined at the cold, but his whine was soon replaced with a hiss as Katsuki slowly thrust two fingers inside his tight heat. With some urging from Izuku, and some minor maneuvering on both their parts, Katsuki was able to find a steady rhythm that had Izuku muttering under his breath.
“Yes, yes, yes, right there, Kacchan,” Izuku whined, hips twitching every time Katsuki hit his prostate, though he was honestly missing it most of the time.
Even though he wasn’t the one with fingers shoved up his ass, Katsuki felt himself go dizzy, his eyes blurring and his neglected cock begging for attention. Each of Izuku’s whimpers and whines made him snarl, like a rabid animal who finally caught his prey.
“More, Kacchan, more, please,” Izuku begged, lifting his head from his pillow so he could look down at Katsuki. “Holy shit,” he muttered, his face and chest flushed deep red. “Shit, Ka - Katsuki, you look so good between my legs right now.”
Despite being three fingers deep inside Izuku right now, Katsuki’s mind went blank. Total blue screen. SOS, emergency.
His cock twitched at the words, fire burning in his veins.
Instead of replying, he hoisted himself up on his knees, balancing himself over Izuku’s body as he leaned down for a filthy kiss. Izuku hummed happily, hands rushing to Katsuki’s face so that he could return the kiss with fervor. It was wet, uncoordinated, and Katsuki’s fingers lost their rhythm, but neither of them really cared.
He felt like he was drowning, like all that mattered right now was Izuku.
“I need you, Kacchan,” Izuku murmured against his lips, his lashes tickling Katsuki’s cheeks. “Please?”
“Yeah, yeah, okay,” Katsuki agreed, easing his fingers out of Izuku carefully so that the other boy’s body shook.
Katsuki felt around the bed for the condom, hand patting the mattress eagerly as the thought of being inside Izuku completely took over his mind. When he found it, he ripped open the wrapper with trembling hands before rolling it onto his dick. Izuku watched with hooded, lust-filled eyes as Katsuki applied more lube to his length.
This time, Izuku spread his legs out further and brought both of his knees towards his chest so that his puffy pink hole was on display. Katsuki placed his hands on Izuku’s hips, making sure that Izuku was still positioned securely on the pillow beneath him.
“Okay,” Katsuki said, easing his hips closer so that his cockhead caught the rim of Izuku’s hole. “Are you - shit, Izuku, are you sure?”
“I’ve never been more sure,” Izuku replied, sounding a lot more confident than Katsuki felt.
“Just - just let me know if anything hurts, okay?” Katsuki asked.
Izuku nodded in agreement, still looking up at Katsuki as if he had hung the moon.
Swallowing the lump in his throat, Katsuki eased forward, the head of his cock popping through the ring of muscle so that he and Izuku moaned in unison at the feeling.
“So good, Kacchan,” Izuku whined, rutting his hips so that Katsuki slid in deeper. “Feels so good, so hot.”
“Heh, yeah, you feel good too, nerd,” Katsuki told him, halting his movements so he could just enjoy the tight heat of Izuku around his dick. Though he told himself he wanted this to last, unfortunately this might end sooner rather than later. “You good?”
“I’m good.”
“Okay, then I’m going to keep going,” Katsuki stated, leaning forward so he could peck Izuku’s forehead.
Izuku nodded. “How - uh - how far are you? This is a lot different than fingers.”
Katsuki glanced at the spot where they’re connected, almost losing his shit right then and there. With a tight swallow, he said, “About halfway. Think you take more, or do you want me to stop?”
“Keep going,” Izuku urged, now wrapping his legs around Katsuki’s waist and pulling him closer, Katsuki’s cock sliding even further inside .
Katsuki released Izuku’s hips, leaning forward so he could prop himself up on his elbows, his face now aligned with Izuku’s. With another chaste kiss, Katsuki continued to ease himself inside until his hips met Izuku’s.
“You can move,” Izuku whispered. “I’m ready.”
With a nod, Katsuki pulled out halfway before thrusting back in with a groan. Izuku let out a small yelp, hands scrambling to hold on to Katsuki’s shoulders. Katsuki paused, looking down at Izuku with concern, though Izuku just told him to continue.
He did his best to build a steady rhythm, though he knew each thrust of his hips were more uncoordinated than the last. Izuku, though, didn’t seem to mind. He continued to praise Katsuki, his nails biting the meat of Katsuki’s shoulders.
His thighs trembled, his hips stuttered, his arms shook, but Katsuki gave it all he had.
“So good, Kacchan,” Izuku praised, bucking his hips up to meet Katsuki’s every thrust. “Touch me, too, please touch me.”
“Right, right, I will, Izuku,” Katsuki replied, reaching down between them so he could finally wrap a hand around Izuku’s neglected dick. “I’ll take care of you.”
Izuku nodded, tears streaming down his face. Katsuki did the only thing he could think of: he leaned down, licking up every tear that spilled from Izuku’s eyes, kissing his cheeks so that Izuku whimpered at the attention.
Katsuki timed the thrust of his hand on Izuku’s cock to the thrust of his hips, chasing his pleasure while also trying to focus on Izuku, Izuku, Izuku.
Sweat was trailing down his back, his temple, his chest. If he wasn’t concentrating so hard, Katsuki was scared he might lose control of his Quirk so that sparks danced across the room. Izuku continued to babble beneath him, losing himself to the feeling.
“Shit, shit, Izuku, I can’t - I’m going to cum,” Katsuki muttered, squeezing Izuku’s cock in his fist.
“Me - me too,” Izuku whined, one hand going to the back of Katsuki’s neck. “Let go, Katsuki. It’s okay, let go.”
With one last jerk of his hips, Katsuki shattered, cum spilling within the condom. He shuddered, feeling completely spent, but he continued to fuck Izuku until the younger boy hit his own orgasm, hot, white cum spurting from his cock onto Katsuki’s fist and Izuku’s stomach.
Katsuki’s body ached all over, his dick sensitive from overstimulation. He couldn’t even think about how Izuku must be feeling.
“I’m okay,” Izuku panted, closing his eyes as he tried to catch his breath. “I’m okay.”
“You did so good, baby,” Katsuki praised, kissing Izuku once before slowly pulling out.
They both winced at the sensation, though Izuku remained on the bed as Katsuki removed the condom, tied it on the top, and threw it in the small trash can next to Izuku’s desk.
“Stay there,” he demanded Izuku, rolling off the bed and padding - naked - out of the room towards the bathroom.
When he returned to the bedroom with a washcloth, Izuku was still laying starfished on the bed, eyes still closed as he slowed his breathing .
“Hey,” Katsuki said, poking Izuku’s side. “I’m gonna clean us both up, then get us clean underwear, okay? Don’t go to sleep yet.”
“Okay, Kacchan,” Izuku murmured sleepily, letting Katsuki drag the washcloth along his body.
Katsuki made sure to clean the cum from Izuku’s stomach and chest, even getting between his thighs for good measure. When he was done, he tossed the washcloth into the hamper, then grabbed two pairs of boxers from Izuku’s dresser. He dressed himself first before making his way back towards Izuku.
“Hips up,” Katsuki ordered, pulling a foot through each opening and tugging them up over Izuku’s legs. Izuku complied, letting Katsuki dress him. When he was satisfied with his work, Katsuki shoved Izuku over and laid beside him. He rolled onto his side, saying, “You okay, nerd?”
“Yeah, Kacchan, I’m good,” Izuku answered, turning his head to the side and peeking an eye open. “Are you?”
“I’m good,” Katsuki answered, reaching over and placing a hand on Izuku’s hip. “I - uh - I hope that was okay?”
Izuku nodded. “Yes, Kacchan, it was okay. It wasn’t perfect, by any means, though,” Izuku teased, causing Katsuki to pinch him lightly. With a giggle, Izuku continued, “I wasn’t expecting either of us to be sex gods our first time.”
“Nah, I guess you’re right,” Katsuki agreed with a small smile. “But you’re sure you’re okay?”
“Yes, Kacchan, I’m really sure,” Izuku assured him, scooching himself closer. “I’m tired, though. Can we take a nap before we go to dinner?”
“Yeah, sure, nerd,” Katsuki replied, throwing his arm over Izuku so that the younger boy could cuddle into him.
Izuku let out another happy hum, nuzzling his face against Katsuki’s chest. Katsuki just held him close, trying not to let the weight of the world overtake him.
Because he had just had sex with Izuku. Izuku. His best friend. The boy he owed everything to.
He knew they would have to talk about this at some point, but for now, he allowed his heavy eyelids to close, holding on to Izuku tightly as he let sleep take him away.