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The first time it happened, Katsuki prayed that it was a fluke.
They were in the classroom, and he was having a bit of a bad day. Normally, on a regular person’s bad days, they would be snappish and churlish, if not downright rude. Considering this was Katsuki’s normal mood, however, his bad days were… a little more explosive.
His friends usually knew to steer clear of him, because their fucking faces and loud-ass personalities would set him off every thirty seconds. The only person who had never been afraid of him on his bad days was the one person who had been there for all of them; Midoriya fucking Izuku. It was nearing the end of the school day, and Aizawa had laid down behind his desk after ordering Class 3-A to get started on their homework. Katsuki had yanked out his notebook with more force than necessarily, slamming his textbook on his desk next. A few of the extras had flinched at the noise, but none of them were brave enough to engage him.
Twenty minutes into the study hall, fucking Deku decided to poke the bear.
“Kacchan,” he whispered from behind him, tapping his shoulder. “Kacchan, are you doing math homework?”
Katsuki tightened his grip on his pencil, clenching his teeth. He really, really didn’t want to explode at Izuku, not after all of the progress they’d made. Katsuki had known about his feelings for the younger boy for a while now, and he was working with Kirishima to try and be a better person; someone who deserved Deku. Right now, though? Now, the slightest off noise was a hair-trigger away from getting an explosion to the face. “Yes,” he ground out, willing himself not to spark in irritation.
“What did you get for number four?” The nerd asked, voice louder now. Sero and Jirou, who sat on Katsuki and Deku’s immediate right, glanced at each other nervously. Katsuki ignored them, closing his eyes to take a deep breath.
“Do your own fucking homework,” he spat out eventually. He could practically feel Deku’s pouting from behind him.
“But Kacchan,” he whined. “You’re better at proofs than me!”
Katsuki couldn’t take it anymore, whirling around to glare at Deku. “Well, that’s not my fucking problem, is it, you fucking nerd!” Deku reared back like he’d been slapped. Katsuki, finally able to let his rage out, kept going. “All I fucking ask for is one day where I don’t have to deal with anyone’s bullshit, is that so much to fucking ask? I mean good god, why can’t you ever just leave me- ”
“Katsuki.”
Katsuki froze, his eyes going wide. He could swear you could hear a fucking pin drop in the classroom with how silent everyone had gone. Deku was staring at Katsuki with his emerald eyes darker than usual, his strong jaw clenched. Deku had a growth spurt at the beginning of their second year, shooting him up a few inches above Katsuki’s head. It had melted a bit more of the baby fat from his face, although his cheeks were still endearingly round. Now, though, he had a sharp jaw and curved cheekbones to offset it, not to mention the multiple ear-piercings he had gotten with Kaminari on a dare. Suffice to say, Deku had gotten fucking hot. And now he was saying Katsuki’s given name in that voice?
“Do not speak to me like that,” Deku continued, keeping his voice quiet. Katsuki swallowed hard, his heart skipping a beat in his chest. And yeah, okay, his cock twitched in his pants. He had never been more grateful for his loose fitting uniform than right at that moment, because jesus. “Apologize,” Deku commanded him, crossing his buff arms over his chest.
Katsuki opened his mouth, aware of the blush on his cheeks. “S-sorry. I… I didn’t mean it.”
It was as if the other persona melted away, and the usual Deku was back. He beamed at Katsuki brighter than the fucking sunshine outside, eyes twinkling with mirth. “Thank you, Kacchan! I forgive you.”
Katsuki slowly turned back around, staring down at his notebook. The classroom erupted into whispers, but it all sounded like static in his ears. He didn’t move another muscle until the bell rang at the end of the day, signaling that they could leave.
(x)
One week later, Katsuki was still thinking about it. He’d used the little incident as jerk-off material for multiple nights that week, whining into his pillow as he fucked back onto his fingers, imagining Deku’s thick cock filling him. Sure, he had jerked off to the thought of Deku before, but never like this. Never like such a… such a whore . It was a bit terrifying, knowing that Deku had him wrapped around his finger.
Or did he? Was it just a one-time thing, because Katsuki had been strung tight all day? Or was it possibly more than that? Listen, he had to test it, okay? For fucking science or whatever. He thought this as he walked to the gym closest to Heights Alliance, where he and Deku got together every Monday, Wednesday and Friday night to train with One for All.
Deku was already stretching inside when Katsuki got there. He smiled at the blond when he noticed him, already beginning to chatter about his plans for their training that day. Katsuki almost felt bad for what he was about to do… almost .
“Fucking whatever,” he snapped, breaking off Deku’s rambling. “Can we fucking get on with it already? I don’t want to fucking be here right now.”
Deku’s smile melted into a frown, and he stared at Katsuki for a moment. He nodded after a few seconds, although Katsuki could see he was clenching and unclenching his fists. “Alright,” he nodded, stepping onto the sparring mat. “I’m only going to be using Black Whip today.”
“Whatever,” Katsuki scoffed, getting onto the mat with Deku. His heart pounded in his chest in anticipation, especially when he saw the flash of irritation in his childhood friend’s eyes. He dropped into a fighting position, glaring at the nerd. “Come at me.”
With that, they began to spar. Every time they fought it was like a hurricane, as they each went all out against each other. Over the years, they had learned to read each other, so they actually had to work to land hits on each other- just the way Katsuki liked it. With the guy only using Black Whip, it was a least a little easier than if he’d been using his other quirks too. With Full Cowling, Black Whip, Float, Smokescreen and Danger Sense, Deku was a nearly unstoppable force. He would definitely become the next All Might one day, much to both Katsuki’s pride and chagrin. By the end of the battle, Deku had Katsuki pinned to the mat, both of them panting and sweating like they’d run a marathon. Katsuki struggled against the green-eyed boy’s hold, realizing he couldn’t get out.
Deku grinned down at him, a droplet of sweat rolling down to his collarbone. Katsuki watched its progress with hungry eyes, although he wiped the look off of his face before Deku could notice. “I win,” the nerd panted, eyes sparkling like fucking gems or some shit. Katsuki twisted his expression into a scowl, knowing what he said next would seriously piss the boy off.
“Whatever,” he shrugged. “I wasn’t trying that hard anyway.”
Sure enough, Deku’s grip on his wrists tightened to a bruising level, his eyes shadowing with the same dark anger he’d given Katsuki the week before. Katsuki’s dick twitched with interest, but luckily, Deku hips weren’t flushed with his own as he straddled him, but rather further up on his waist with his legs pinning Katsuki’s own to the ground. He spoke through clenched teeth, muscles bulging beneath his sweaty t-shirt. “What the hell is your problem , huh? What makes you think you can talk to me like this?”
‘ Oh, fuck,’ Katsuki gulped, going from flaccid to rock hard in a second. ‘ Oh fuck, oh fuck, oh fuck, it’s not a one-time thing.’ “B-because,” he stuttered, “You- you-”
“I what?” Deku asked, voice dark with promise. “Spit it out.”
“I’m- I’m sorry,” Katsuki whispered, biting the inside of his cheek before he could say too much, like ‘Please fuck my brains out.’ “I don’t know why I said that.”
Deku nodded once, letting Katsuki go to get off of him. Once he was standing, he held out his hand for Katsuki to take. Katsuki eyed it for a moment, remembering a time when such a gesture would have felt like an insult. Now, it felt like a truce. He grabbed the shithead’s hand in his own, feeling the way his calluses and scars scraped deliciously over his sensitive palms. Deku yanked him to his feet, giving him a small smile. “You’d tell me if something was wrong, wouldn’t you Kacchan?”
Katsuki looked down at the ground, where their socked feet stood out against the electric blue of the sparring mat. “Sure,” he mumbled. “I’m just tired, I guess.”
He knew damn well that Deku knew when he was lying, although how, he couldn’t guess. Even so, Deku didn't call him out on it. “Alright Kacchan. We should probably shower and head back.”
“Okay,” Katsuki agreed, mechanically following Deku to the attached locker rooms. He was going to need an ice cold shower to get through the walk back to the dorms, that was for sure.
(x)
After that, it was like clockwork. Once a week, Katsuki would pick a fight with Deku for one reason or another, until he could get the bigger boy to snap on him. Something about the way the fight filled his eyes just did something for him. He loved the annoyed expression on Deku’s face, the way his sharp jaw clenched, how he tightened his fists until the knuckles cracked threateningly. It might have been terrifying to a lesser man- i.e., anyone other than Katsuki- but to him, it was like fucking manna from heaven. He could no longer get off at night unless he was thinking about one of these instances.
“D-Deku,” Katsuki whined into his pillow, sweat cooling on his body in the chill of his dorm room. “Fuck!” He thrust two of his fingers into his ass, crooking them in just the right way so they pressed against the hot bundle of nerves inside of him. He knew from experience that if he teased himself enough, he could cum without even touching his dick, and it was what he was going for tonight. Everyone was asleep already, but he’d stuffed his face into his pillow to muffle the noises he knew would escape. The problem with Katsuki was he was fucking loud when he got off, no matter how much he tried to stay quiet. It was a bit embarrassing, considering he shared a wall with his best friend, but then again, he’d heard Kirishima fucking IcyHot enough times that he had no right to complain.
He’d already been working himself for half an hour, and could feel he was this close to cumming. He imagined Deku, hovering behind him, one hand pressed on his lower back to keep his body arched, the other hand working fingers in and out of his hole. ‘You like that, fucking bitch?’ Deku’s voice whispered through his mind. ‘Tell me how much you like it.’
“I- I love it,” Katsuki groaned, biting the fabric of his pillowcase.
‘I bet you do,’ Deku snarled, quickening the pace of his fingers. ‘Are you going to fucking cum for me, slut? I bet you’d look so pretty doing it, wouldn’t you baby?’
“Yes,” Katsuki breathed, tears burning in his eyes. “Yes!”
‘Then cum ,’ Deku chuckled.
Katsuki came. Then, a few minutes later, once he calmed down, he wallowed in his own shame for the rest of the night.
(x)
Izuku had enough. For weeks now, Kacchan had been picking fights with him left and right, like he was trying to get something out of him. At first it had been strange, because usually Katsuki avoided pissing Izuku off due to their fledgling friendship. Apparently, whatever he’d been worried about had been tossed out the window, because it was like clockwork now. Once a week, he would push Izuku’s buttons, and once a week, Izuku would snap and yell at him until he shut the fuck up.
He was getting tired of it. Midoriya wasn’t an angry person, but it was like Kacchan brought out a completely different side of him. The blond had always known how to piss him off, and recently he’d had no qualms about bringing out the big guns. Hell, the last time they’d fought, he’d had the fucking gaul to tease Izuku about his snivelling middle school self! Now today , here they were doing homework in Izuku’s room, and the blond was goading him again.
“It’s not that fucking hard, you damn nerd,” Katsuki sniped, jabbing his eraser down onto Izuku’s paper. “You just have to match the fucking proof to the method it’s using, like side-angle-side, or angle-side-angle!”
“I already said, this is hard for me!” Izuku snapped right back, slamming his fist against the desk. Katsuki jumped at the noise, ruby eyes widening a fraction. Izuku screeched his chair back and got to his feet, grabbing the arms of the desk chair Katsuki sat in to turn it around. Once the back of the chair rested against Izuku’s desk, the bigger boy placed both of his hands on the arms of the chair and leaned in until his face was mere inches from Kacchan’s. “I’m going to ask you one more time,” he began, a hard edge in his voice. “And this time, you’re going to be honest with me. What. The fuck. Is going on with you?”
Katsuki’s face began turning red, with what Izuku assumed was anger. The boy’s adam’s apple bobbed when he swallowed, his fists tightening in his sweatpants where they lay on his lap. He hunched his shoulders a bit, ducking his head to stare down at Izuku’s thighs. “Nothing,” he barked. “Just drop it, okay?”
“Katsuki,” Izuku warned, dropping the boy’s given name. He didn’t use it often, only when he wanted to get the blond’s attention. It did its job now, forcing the older boy to snap his head to look up at Izuku. “I said I wanted honesty, didn’t I?”
Bakugou looked like he wanted to say something, but bit his tongue. When he stayed silent, frustration ate at Izuku like a monster in his chest. The arms of the chair creaked under the strain of his vice grip, but he ignored the sound. “I tried to be nice, Kacchan, but you’re being a real brat lately. What is it gonna take for you to just tell me?”
Katsuki dropped his eyes again, setting his jaw in determination. He really wasn’t going to say anything, and it was pissing Izuku off. He opened his mouth to really lay into the blond, glancing down his body subconsciously as he thought of what he was going to say. That was when he noticed it, and paused. Katsuki… Katsuki had a boner. Although his sweatpants were loose, Izuku could still see the bulge through the grey material. He glanced back up at his friend’s face, and for the first time, realized that the redness of his cheeks wasn’t out of anger. He was… he was blushing.
Katsuki was turned on.
“Oh,” Izuku said, dumbfounded. Katsuki snapped his eyes back up to his, raising a perfect eyebrow in challenge.
“‘Oh,’ what?” he asked. Izuku’s mouth quirked up on one side, thinking back over all of their other interactions recently. Each time Kacchan had riled him up, he’d left the scene in a hurry. Now that he was really thinking about it, it was never that hard to get Katsuki to calm down and apologize. He was doing this because he wanted it- wanted Izuku.
The thought made Izuku’s face break out into a grin. Katsuki shifted a bit in his seat, which made Izuku’s eyes flick down to his crotch again. Katsuki noticed him looking and turned redder than Kirishima’s hair, and in the next moment, both of his palms slammed against Izuku’s chest. Midoriya stumbled back, surprised, and Katsuki shot out of the chair, preparing to run.
Izuku wasn’t about to let him go that easily. He reached out and grabbed both of the shorter man’s biceps, holding him still. Katsuki struggled against his hold for a moment, clearly panicking. “Deku, let me go.”
“No,” Izuku said smoothly, tilting his head a bit. “You’ve been egging me on because you like it, haven’t you, Kacchan?”
The way the tips of the blond’s ears turned red was telling. “Let me go!”
“I don’t think I will,” Izuku said, trailing his eyes over Katsuki’s body. Now that he was looking closer, he could see the slight goosebumps on the boy’s skin, and the way his nipples pebbled through his black tank-top. “You get off on this, don’t you Kacchan?”
“No,” the other boy said, although his voice cracked with the word. Izuku released one of his biceps, grabbing the boy’s chin to tilt his head up. He was surprised to find his lower lip trembling a bit, and a sheen of embarrassed tears in his eyes. Katsuki didn’t cry often, but when he did, it was usually because he was either embarrassed or really angry. The last time Izuku had seen him cry because he was genuinely upset was their fight at Ground Beta that had changed everything.
“Oh, Kacchan,” Izuku cooed, stroking Katsuki’s jawline with his thumb. “You look so pretty when you cry.”
The way every muscle in the blond’s body tensed was adorable. He met Izuku’s eyes finally, seeming shocked. “What?”
“What?” Izuku parroted back, still smiling. He leaned in closer, forcefully turning Katsuki’s head with the grip he still held on his chin. He ran the tip of his nose down the curve of Kacchan’s neck, inhaling his sugary-burned scent. Kacchan had always smelled like candy and woodsmoke, the most intoxicating aroma in the world to Izuku. He could already feel his dick getting hard through his athletic shorts. “Isn’t this what you wanted?” He purred in Katsuki’s ear. Bakugou’s hands scrabbled at Izuku’s shirt, bunching it up in his fists as he held on tight.
“D-Deku,” he whimpered, sounding like music to his ears. Izuku hummed, releasing his hold on Katsuki’s chin to trail his hand down his neck. In the next moment he grabbed his throat, not tight enough to cut off his blood supply, but enough that Katsuki could feel the possibility of it. He let off a choked moan before he clamped his jaw shut, refusing to make any more noise.
“Oh, don’t do that,” Izuku said, pressing his lips to the burning skin just beneath the knob of Katsuki’s jaw. He felt the smaller man shiver in his arms. “I want to hear all of your cute little sounds, Kacchan.”
“Shut up,” Katsuki hissed, his voice trembling. Izuku laughed again, nipping at the pale skin. Katsuki’s ancestors on his mother’s side were from Russia, which was what gave them both their pale skin, red eyes and blond hair. Izuku’s mother was Japanese, whereas his father had been a Hawaii native, where he’d gotten his darker hair, dark skin and his curls. Izuku enjoyed seeing the contrast between them as he touched Katsuki.
“Don’t speak to me like that, or I’ll stop touching you,” he warned, letting his warm breath coast over the other’s skin. Katsuki fell silent, not taking the out Izuku had given him. Izuku’s small smile broke into a satisfied grin. “Alright then.”
Before Katsuki knew it, he was being shoved back onto Izuku’s bed. He bounced a bit, making a startled noise, but Izuku was already climbing over him, grabbing both of Katsuki’s wrists in one hand to pin above his head. Izuku’s hands had always been large, but they seemed especially so against Katsuki, due to the blond’s lithe, muscular form. Izuku had often wondered if he could fit both of his hands around Kacchan’s tiny waist, and had more than often cum to the thought of it. He’d never thought he would get the chance to find out.
Izuku shoved himself between the smaller man’s legs, spreading his knees a bit to force Katsuki to rest his calves on Izuku’s thighs. With his thighs so wide, it was easier to see his hardness through his sweatpants. Izuku preened at the knowledge that he was the one who had put it there. He dragged his eyes back over Katsuki’s body, licking his lips at the sight of his pale, toned abs peeking out from where his tank-top had ridden up thanks to Izuku tossing him on the bed. He wanted nothing more than to leave bites and bruises all over him.
“So gorgeous,” he mumbled, leaning to level his face with Kacchan’s. He was staring at Izuku like he’d never seen him before, mouth slightly parted in awe. Clearly, he’d thought this was as likely to happen as Mineta getting laid. Izuku couldn’t take the anticipation anymore and leaned down, crushing his mouth to Katsuki’s. The blond opened up for him like a blooming flower, opening wider in invitation. Izuku took the opportunity to lick into his mouth, stroking the other man’s tongue with his own filthily. The sound that Katsuki let out was pornographic, and when he bucked his hips up instinctively, he ground his erection against Izuku’s. They both groaned at that, and Izuku bit Katsuki’s lower lip in retaliation.
He broke the kiss and pulled away, watching Katsuki try to chase his lips. “Tell me you want this, Kacchan.”
“Deku, I- I-” Katsuki stuttered, ruby eyes shadowed with a daze. Izuku leaned down and peppered kisses down the man’s neck, trailing toward his collarbone. Katsuki arched into the touch, trying to buck his hips again. Izuku lowered his weight onto his knees and using his free hand to grab Katsuki’s hip, pinning him to the bed.
“Say it,” Izuku coaxed. Katsuki panted into the air, frustration clear in his tone.
“I want it!” He snapped. “Are you happy now?”
“I might be, if you weren’t being such a brat,” Izuku sighed, pulling back. Katsuki whined at the loss of his body heat, trying to move his wrists from Izuku’s tight hold. Deku didn’t let him move so much as a centimeter, keeping him right where he wanted him. He did move his hand from the volatile boy’s hip however, flattening his palm to the exposed skin right above the waistband of the smaller man’s sweatpants. His skin was hot to the touch, more feverish than usual due to his desire. Izuku dragged his palm up further, pushing the tank-top up, up, up, until the entirety of Katsuki’s torso was exposed to him. His nipples were pink and puffy, rested atop his ample pecs like candies. Izuku’s mouth watered at the sight of them, and after looking at Katsuki’s face for a moment, he dove down to suck one into his mouth. Katsuki inhaled sharply, pushing his chest closer into Izuku’s face.
“Deku!” He yelped, trying to move his hands again. Izuku kept them pinned, liking the way the position made his chest puff out more. He switched sides, biting into his other nipple gently. At the encouraging noise Katsuki made, he scraped his teeth over the nub a little harder. The smaller boy outright keened, grinding his hips on Izuku furiously. Izuku had always had his suspicions that Katsuki was a virgin, but his reactions to his touch confirmed it. The thought made Izuku smile. He’d loved Katsuki for so long, and when he was a young teenager, he’d imagined them losing their virginities to each other countless times. The fact that it was about to happen warmed his chest.
“How far are you wanting to take this?” Izuku asked, wanting full consent before he did anything else. Katsuki’s chest rose and fell with every breath he took, practically thrusting those lucious pecs into Izuku’s face.
“Fuck me,” Katsuki demanded. This time, when he moved his wrists, Izuku let them go. Katsuki didn’t waste any time in fisting the back of Izuku’s hair to yank him down, pressing their lips together in an uncoordinated, sloppy kiss. Izuku melted into it, laying his weight over the entirety of Katsuki’s body. After a few moments, they got the hang of it, tasting each other breathlessly. Izuku noticed that even Katsuki’s saliva was tinged with sweetness, like the glycerin from his pores existed even there. Izuku could taste it forever.
One of Katsuki’s hands skated over Izuku’s torso, moving down until he could push his shirt up, his soft, hot palm running over Izuku’s muscles. The impatient man broke away from the kiss, now using both hands to try and yank Izuku’s shirt over his head. Midoriya got to his knees and helped him get it off, tossing it across the room and out of sight. For that moment, he felt somewhat embarrassed, and cast his eyes down on the bed so he wouldn’t have to see Katsuki’s face. He was covered in scars, from the strips on his arms and hands to various other wounds, like where the Noumu from the Stain Incident had dug its talons into Izuku’s shoulders, or where some of Overhaul’s spikes had scratched him.
“Oi, oi! Where the fuck are you looking, dipshit?” Katsuki asked. Izuku met his eyes again, biting his lower lip. Despite the various injuries Katsuki had gotten over the years- read, getting fucking impaled for Izuku in their first year- the glycerin from his pores meant that his skin was basically impossible to scar. His mother was the same way.
“My… my scars,” Izuku admitted, scratching the back of his neck. “I know they’re ugly.”
Katsuki was silent for so long that Izuku was worried he’d passed out or something, but when Katsuki blinked at him like he was an idiot, he knew that he was conscious.
“They’re fucking hot,” he said, completely straight-faced. Izuku’s cheeks burned crimson, pleasure building in his chest at the compliment.
“You think so?” He mumbled. Katsuki rolled his eyes, reaching out to caress one of the bigger scars on Izuku’s left pec. It was from one of their internships that year, when he’d saved a civilian from being crushed inside of a collapsing building at the cost of getting slightly stabbed with a steel beam. Kacchan had been fucking pissed at him, but he’d lived, so.
“Do I ever say anything I don’t mean?” Kacchan asked, his voice soft. Izuku smiled down at him, cupping his face gently with one hand. When the blond closed his eyes and leaned into it, Izuku realized that he wouldn’t be able to do this unless they got something straight.
“Kacchan,” he began, unsure of how to say it. “Is this… is this a one-time thing?”
Katsuki opened his eyes, scowling. “Fuck no. If you’re fucking me, you’re mine, got it?”
Izuku’s smile grew into a beaming grin. “Got it.”
“Now that that’s over with,” Katsuki said, yanking at Izuku’s shoulders until he was laying on top of Izuku again, “Get fucking moving already. I’m hard as a rock.”
Izuku’s eyelids lowered, lust returning to him. “Maybe I should just tease you until you cum in your pants like a pre-teen, just to make you suffer a little.” He rolled his hips down, causing their erections to rub against each other through their pants. Katsuki tilted his head back, gasping. Not for the first time, Izuku realized that he really liked this. He liked it when Izuku held him down and forced him to do what he wanted. He wondered if it had anything to do with Katsuki’s usual controlling personality, but decided that he could analyze it later, when he wasn’t at risk of mumbling and ruining the mood.
“Don’t you fucking dare,” Katsuki warned. Izuku smirked, raking his fingernails over Katsuki’s pecs again, making sure to catch his nipple on the way down. He moaned at the sensation, squirming underneath Izuku’s weight. He was so cute that it made Izuku’s heart ache. He leaned down and began peppering kisses to Kacchan’s neck again, licking at the sweet skin and nipping every so often. He hadn’t even realized he was muttering until Katsuki moaned again, his cock pulsing between their bodies.
“Shut up,” the older boy hissed, his blush reaching all the way down to his chest. Izuku tried to remember what he’d been thinking, and thus muttering. ‘Kacchan is so perfect, so cute. I love this, love tasting you.’
“Praise kink?” he said out loud without thinking. Katsuki lifted a hand like he was going to blast Izuku, but before he could, Deku snatched his wrist and pinned it to the bed again. He frowned, raising an eyebrow down at Katsuki. “You’re really not helping yourself, here. I could leave you like this, you know, hard and wanting more. Do you want that?”
“No,” Katsuki hissed, the beginnings of tears pooling in those crimson irises. Izuku smiled, moving to take Katsuki’s shirt off. Once it was tossed across the room with his own, he got to work at Kacchan’s sweatpants and the tight, black boxer-briefs underneath. Once he was laying there naked, Izuku took his time staring at him, cataloguing everything about his body. The beautiful ridges of his abs, the curve of his tiny waist, the ‘v’ of his adonis belt leading down to the small patch of blond that rested just above his dick. It was about six inches long, as red as its owner’s eyes and dribbling with precum already.
“Never knew dicks could be pretty,” Izuku muttered, his mouth watering with the urge to suck it down his throat. Katsuki used his free hand to cover his face.
“You’re so fucking embarrassing,” he groaned, although the way his prick twitched gave away the fact that he liked it. Izuku’s smirk returned, and without fanfare, he made his way down Katsuki’s body until he was eye level with his cock. He used one of his hands to stroke it from tip to root, spreading the wetness from the mushroom head down to cover the entirety of the burning skin. Katsuki’s moan was loud and pleading, his hips bucking a bit against the pressure. Izuku glanced up at his face to make sure he was alright, and when he saw no rejection, he leaned in to give a kitten lick to the head. Sure enough, even his precum tasted a bit sweet, although still slightly salty and bitter like a normal man’s cum. Izuku wanted more of it.
“Want me to suck your cock, baby?” He asked, tightening his fingers at the base of Katsuki’s cock to stave off any orgasm he may have. Katsuki nodded quickly, shifting onto his elbows so he could get a better view of Izuku.
“God, yes! Please, please suck my dick.”
“I like begging,” Izuku said, wetting his lips in anticipation. “Remember that, Kacchan.” Without hesitation, he leaned in and sucked the head into his mouth, swirling his tongue around it. The sound that Katsuki let out was nearly enough to make Izuku cum in his shorts, but he reached down with his free hand to grab his own dick, squeezing just on the wrong side of too hard to stop it. He took Katsuki’s dick further into his mouth, swallowing down, down, down, until his lips touched the ring his fingers made at the base. He held there for a moment, enjoying the wanton moans that the smaller man was letting out. When he couldn’t hold his breath anymore, he came back up for air, dipping his tongue into the slit of Katsuki’s dick.
“Fuck, fuck,” Katsuki whined, pressing his hands down to Izuku’s comforter. Small sparks rained down onto the fabric as Katsuki’s quirk went off, burning the excess nitroglycerin from his palms. It was cute how he couldn’t control his quirk like this. “Deku, I need you inside of me, now.”
“Be patient,” Izuku said, although he himself was growing restless. He glanced at his nightstand, where he knew his lube lay. “Open the nightstand and get the lube for me, Kacchan.” He didn’t bother waiting to see if the boy was going to do it before he went back down on his cock, sucking his cheeks in to create the perfect amount of pressure. A minute later, one of Katsuki’s hands appeared in Izuku’s eye level, holding the bottle of lube Izuku had been talking about. The green-eyed man pulled off of his cock, taking the lube. He popped the cap open and squeezed a bit onto his fingers, rubbing them together to warm it up. When he looked up, he saw Katsuki watching him, a bit of trepidation on his face.
“Do you want to stop?” he asked. Katsuki furrowed his brow and shook his head, his hands clenching in Izuku’s comforter once more.
“No way,” he said. “Just- just be careful, okay? Your fingers are bigger than mine.”
Izuku smirked. “You finger yourself, huh?” He reached and traced the rim of Katsuki’s ass with his first finger, revelling in the way it made the man’s thighs tremble. “Do you think about me while your fucking yourself, Kacchan?”
“Y-yes,” Katsuki admitted through gritted teeth. Izuku blinked up at him innocently.
“Yes, what?”
“Yes, I fucking think about you fucking me when I finger myself!” Katsuki snapped. Izuku smiled at him cheerily, slipping his finger inside of his hole. Katsuki arched back, breath catching in his throat. He opened up easily around Izuku’s finger, although he clenched tightly around it, sucking it inside of him.
“Was that so hard?” Izuku teased, slowly pulling his finger out before pushing it in again. “You must do this often, don’t you? You’re opening up so good for me.”
“Deku,” Katsuki panted, smoke curling up from his palms.
“That’s not my name, angel,” Izuku said, pulling his finger out completely. Kacchan whined like a bitch, trying to move his hips down to trap the digit inside of him again.
“I-Izuku!” He pleaded. “Please !”
“Good boy,” Izuku praised. This time, he slid two fingers inside of the man, slower than he had the first one. Katsuki had been right in his assessment of Izuku’s fingers being bigger than his, as two of Izuku’s probably equaled three or four of Katsuki’s. The older man had always had small hands, despite the massive explosions he could create with them. It was one more thing about him that Izuku found unbearably endearing. He crawled back up Katsuki’s body, keeping his fingers between them while he kissed the blond. Tongues and teeth were added to the equation, a battle just like everything else between them. Once Izuku was sure he was ready, he added a third finger, spreading them a bit to try and stretch his hole as much as he could.
“You can touch me, Kacchan,” Izuku whispered, breaking their kiss. Katsuki shook his head, frowning. Izuku understood his unspoken concern. “I don’t mind if you use your quirk on me.” From the way Katsuki’s eyes widened, he was clearly surprised to hear this. Izuku’s smile was more than a little dirty. “I’ve thought about this a lot, baby. Go ahead.”
Katsuki lifted his hands, gently placing them on Izuku’s shoulders. Izuku waited a moment for the smaller to get used to it before he curled his fingers up, pressing hot against his prostate. The blond cried out, fingernails digging in and sparks popping against Izuku’s skin. The pain was welcome, and Izuku groaned along with him, thrusting his fingers in and out of the boy.
“Inside,” Katsuki breathed, rocking his hips with Izuku’s movements. “Don’t wanna cum yet.”
“You sure you’re ready?” Izuku asked. He was still in his basketball shorts and boxers, and the material trapping his dick was stifling. He was more than ready to fuck his childhood friend, but not until he was sure he was ready. Katsuki rolled his eyes, lightly shaking the bigger man’s shoulders.
“Fucking yes, do it already!”
Izuku sighed despite the smile on his face. “Alright, Kacchan.” He slipped his fingers out of the boy, watching his face contort in displeasure at being empty again. He got off of the bed and grabbed the waistband of his shorts and underwear, pulling them both off at once. When he checked Katsuki’s expression, he very nearly laughed at the look on his face. He was staring down at Izuku’s cock like he’d never seen a penis before. Izuku knew that he was pretty big, sitting around eight and a half or nine inches, slightly curved upward, and thick. A “monster cock,” if Ochako was to be believed. (Don’t ask.)
“Holy shit,” Katsuki said. “Get over here and fuck me right now.”
Midoriya didn’t bother holding back his laugh this time, climbing into bed again. Katsuki spread his legs open obscenely, making grabby-hands at Izuku like a child. He settled down over him, feeling Katsuki’s fingers dig into his shoulders again. He used the leftover lube on his fingers to coat his dick, mixing with the wetness at his tip that had been gathering since he’d first noticed the hard on in Kacchan’s sweatpants. He closed his eyes and moaned from the stimulation, already knowing that he wasn’t going to last long once he was inside. Then again, from the looks of it, Kacchan wasn’t going to, either.
“Ready?” he asked, opening his eyes. Katsuki nodded, aching up a bit so his ass was more accessible. Izuku guided the head of his cock to Kacchan’s opening, circling it for a moment before he slowly began to press inside. The feeling of Katsuki’s hole giving way to him was indescribable, his tight, warm channel easily the best thing he’d ever felt in his life. Katsuki mewled like a kitten from the feeling, more sparks popping off from his hands, burning into Izuku’s shoulders. He honestly wouldn’t mind a few scars from this experience, although he didn’t think the burns were serious enough for that.
Finally, the head was completely inside of the smaller man. They were both panting up a storm, staring down at where they were connected. After a moment or two of getting used to it, Kacchan of course got impatient again. He wiggled his hips, trying to move further down onto Izuku’s prick. “Hurry up, would you?”
“God, give me a fucking minute!” Izuku snapped, glaring at his partner. Katsuki’s body stiffened up, and if it weren’t for the way his hole fluttered and his cock twitched, Izuku might have felt bad for snapping. Instead, he pushed inside of the boy a few more inches, revelling in the look of pure, unbridled lust on the other’s face. He was the one making Kacchan feel like this. If he had any say in the matter, then he would be the only one to make Kacchan feel like this.
“I bet you like this, don’t you?” He asked, keeping his voice low and firm the way Kacchan liked it. “You like being stretched over my cock, don’t you, slut?”
“Yes,” Katsuki moaned, rocking into Izuku’s movements. “More, please!”
“I bet you’d let anyone use this sloppy hole of yours, wouldn’t you?” Izuku snarled, shoving deeper and deeper, until finally his hips settled flush against Kacchan’s. By now, Katsuki was raking his fingernails over Izuku’s back hard enough to break skin. He didn’t appear to notice, too entranced in the feeling of being filled for the first time, and Izuku didn’t say anything to stop him. He liked a bit of pain.
“No,” he said, swallowing hard.
“No?” Izuku asked. He pulled out a bit, pushing back in with a snap of his hips. Katsuki yelped as the bundle of nerves inside of him was stroked, gasping loudly. “No, you wouldn’t let just anybody fuck you like this?”
“No!” He insisted. Izuku grinned, pulling almost all the way out this time. Logically he knew he should be more gentle- after all, this was Katsuki’s first time- but his logical mind and his lizard hindbrain were saying two different things. Once only the head of his cock was inside, he slammed his hips back into him, moving Katsuki a few inches up the bed with the force of the thrust.
“Why, Kacchan?” Izuku asked, bracing his weight with one hand near Katsuki’s head. He used his other to grab hold of Katsuki’s hip, keeping him in place as he set a hard, rough pace. “Why won’t you let anyone else fuck you?”
“B-because-” Tears were beginning to fall down those pale, unblemished cheeks, much to Izuku’s delight. He’d seen Kacchan cry because of embarrassment, because of anger, and because of sadness. It was about time he got to make him cry out of sheer pleasure.
“Because you’re mine,” Izuku finished for him, more growl than anything else. “Isn’t that right, baby?”
“Yes!” Katsuki cried, bouncing on Izuku’s dick as best he could. “Yours!”
It wasn’t long until the pressure in Izuku’s lower stomach built up. Feeling Kacchan squeezing and fluttering around him was too much, especially with the open-mouthed, teary-eyed expression on the boy’s face. He could tell from the way Katsuki was rhythmically clenching around him that he was close, too. “You wanna cum, angel? You wanna cum all over my fat cock?”
“P-please,” Kacchan begged, moaning like a whore. “Please let me cum!”
“Nothing’s stopping you,” Izuku said, expecting more tears and begging. What he hadn’t expected was the feeling around his prick to tighten until he could hardly move as Katsuki came without touching his dick . Another fun fact about Katsuki that Izuku hadn’t known before? He came silently, holding his breath like he was afraid of ruining his orgasm. Everything about it was so hot, so tight, and Izuku couldn’t take it anymore. He spilled inside of his partner, thrusting as deep inside of him as he could go. Izuku had never been one to cum quietly, and now Katsuki knew that too. He growled and groaned through the tremors of his orgasm, keeping his hips flush against Katsuki’s. It belatedly occurred to him that he should have used a condom, although he wasn’t too worried about it, considering they couldn’t catch anything from each other. He already knew Kacchan was going to bitch at him later about cleaning cum out of his ass.
Once the aftershocks had subsided, Izuku gradually pulled out of him. Katsuki’s nose scrunched up, his ass clenching a bit around nothing. Cum dribbled out of him, and Izuku watched it for a moment, mesmerized. Katsuki flicked the side of his head, scowling at him when he looked up. “Fucking pervert,” he muttered, although the words held no bite. Izuku smiled sheepishly at him, getting off of him to flop at his side on the bed.
Part of him couldn’t believe that that had just happened- he’d really fucked Kacchan, oh my god- and yet, another part of him wasn’t surprised at all. When it came to each other, it was inevitable.
In a choice between Katsuki and the world, Izuku knew who he would choose.