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It hadn't been hard to get up to Deku's apartment, all things considered. He'd gotten pretty good at using his quirk for upward propulsion.
He hadn't even needed to break Deku's window, since it was wide open. Deku was on his bed, looking over the notebook that bore the characteristic scorch-marks of Katsuki's quirk. Because of course he still had it after all these years.
Just a reminder of all the ways that Deku ignored him.
Deku looked up when he heard Katsuki climbing through the window, his clear green eyes going wide with surprise.
"Kacchan?"
"Yo," said Katsuki, as casually as he could.
Deku made a face. "You've been drinking," he said reproachfully. For once, Katsuki was pretty sure he knew what he was thinking: they were both eighteen, which meant Katsuki was drinking underage. And heroes weren't meant to break the law.
"No shit," said Katsuki, walking over to the bed with only minimal wobble. Deku always looked good, but there was something about seeing him in a rumpled t-shirt and boxers that made his mouth go dry.
"Why are you here?" Deku asked, his frown deepening.
Katsuki didn't answer, choosing instead to sit down and pluck the notebook from Deku's hand, tossing it aside. When Deku didn't stop him, Katsuki swooped in for a kiss.
And Deku kissed back.
Katsuki groaned when Deku opened his mouth to accept his tongue, his entire body buzzing. He somehow managed not to break the kiss as he maneuvered himself fully onto the bed and straddled Deku at the hips. He took Deku's face between his hands, exploring his mouth, tasting his tongue. Heat pooled insistently between his legs.
Deku was the one who pulled back from the kiss, letting out a shuddering breath. "Kacchan..." he breathed. Beyond that, he seemed at a loss for words.
Katsuki was happy to take advantage of the opening, sliding his body lower on the bed until his head was level with Deku's crotch.
"Wanna suck you off so fucking bad," he slurred, nuzzling his cheek into the growing bulge in Deku's boxers. "I'll make it so fucking good for you, Deku. I'll let you come down my fucking throat." His own cock jumped eagerly at the thought.
Deku reached down and pushed Kastuki's head away. He must've found his voice again, because he said, "You wouldn't be doing this if you were sober, Kacchan." His voice was strained and a little sad.
"Yeah, you fucking dumbshit," said Katsuki, jerking his head away from Deku's hand. "Why'd you think I decided to get shitfaced in the first place?" He was looking down at Deku's crotch like a cat eyeing a goldfish. "After all the shit I put you through, don't you think I owe you at least a couple'a blowjobs?"
Deku frowned. "Nobody owes anybody that kind of thing, Kacchan. If you really regret the past, then give me an apology."
Katsuki looked up at his face, at that frown that he'd always found so fucking adorable, his eyes glazed and hungry. "Never said I regretted a fucking thing." He licked his lips. "So you can forget your motherfucking martyr complex for once and use me. I fucking want you to." He looked Deku directly in the eyes. "You wanna fuck me, Deku? Fill me up? I'll fucking let you."
Deku's adam's apple bobbed visibly, and the tent in his boxers actually twitched.
Katsuki smirked lazily. "Or maybe you want me to fuck you instead. I'd get you nice and slick first, take it real fucking slow. Make it so fucking good you'll beg me for more."
Deku took in a shuddering breath, screwing his eyes closed, as his cock gave another twitch from within the confines of his boxers. "This isn't right, Kacchan."
Sensing an opening, Katsuki once again made a beeline for Deku's crotch, mouthing at the fabric where it was stretched over his erection. He took in a shuddering breath of his own. "Fuck, Deku. You smell so fucking good. Wanna make you come for me so bad."
Deku let out a whimper, which he tried too late to muffle. "Why...all of a sudden?" he asked, the words almost a whisper.
They'd barely even started and Deku was already so fucking wrecked.
Still, the question made Katsuki let out a bitter chuckle. "'All of a sudden'?" His expression twisted, then, as old anger bubbled up through the haze of booze and lust. "Are you fucking with me?"
Deku opened his eyes at last as he shook his head. He looked so fucking confused.
It only pissed Katsuki off more. "Fucking figures. Dumbfuck Deku: too busy using me as an 'inspiration' and writing in his shitty notebook to actually see anything that fucking matters." He was running out of patience, now. For years, he'd thought Deku was looking down on him, acting like he was better even though he'd had fucking nothing.
And then, the second time they'd fought, he'd learned that Deku'd actually seen him more like a human motivational poster - the Not Quite All Might that Deku could chase after to achieve his dream.
It hadn't made it better. It should have; if it had been anyone but Deku, it fucking would have. But it hadn't.
Deku could admire him; Deku could hate him; Deku could think the sun shone out of his ass. It didn't fucking matter unless Deku wanted him. Unless he lay in bed at night jerking it to the thought of Katsuki touching him, the way Katsuki had done too many times to count. Just once, just fucking once, he wanted to drive Deku as crazy as Deku drove him.
And so the fuck what if Deku was a loser virgin who would probably be just as fucking hungry for it from any other moderately attractive person? (Like the half-half fucker or Uraraka, his mind supplied. Fuck, fuck, he didn't want to think about that shit.) Katsuki was drunk, and so turned on that he could spontaneously combust - literally. For now, it was close enough.
There was still an angry voice in his head yelling at him about his pride. About how he should never be on his knees for anyone, let alone Deku. It was the same voice that had tormented him for years, every time he'd looked at Deku and ached. The booze made it easy to ignore, though. The booze made him able not to give a shit about anything but what felt good. And touching Deku felt so fucking good.
He pulled Deku's boxers down.
Fuck, his cock was gorgeous. Katsuki couldn't resist the impulse to lick away the precum that had gathered at the tip. Deku shuddered bodily in response.
"You'd better fucking watch me now," Katsuki growled, rocking his own hips into Deku's mattress. "I'm gonna suck your dick, and you're gonna keep those pretty eyes open the whole fucking time. I'll fucking end you if you look away."
"Kacchan..." breathed Deku, still confused but even more desperate. His eyes were wide open.
Katsuki finally did what he'd been dreaming of since he was thirteen.
He'd never given anyone a blowjob before, but he'd watched a fuckton of porn about it. There was instinct, too - which was what made him start by licking up the length of Deku's cock. Deku shuddered again as his cock jumped, precum oozing out of the tip. Katsuki took that as an invitation to put his mouth around the head of Deku's cock and lap it all up.
"K-Kacchan. I don't think-" Deku whimpered helplessly as Katsuki moved his mouth lower on his cock, his tongue now playing with the vein on the underside. "If I keep l-looking, I'm not gonna last."
Good. Katsuki didn't fucking want him to last. He caught Deku's gaze as he took in even more of his length, then started to bob his head. He brought up a hand to stroke at the parts of Deku's cock that he couldn't reach with his mouth.
It had always pissed him off that he could never quite know what Deku was thinking. But now, for once, he had no fucking doubt.
"Kacchan," Deku moaned, and Katsuki felt his hands sliding into he hair. "It feels- I can't-" The hands in his hair tightened as Deku's moans started to rise in volume. "Ah, Kacchan!"
Katsuki groaned as Deku spurted into his mouth. The taste of Deku's come, the glazed, blissed-out look in his eyes, the fucking sounds he was making - it was too fucking much. Katsuki rocked his hips against the mattress and came hard in his pants.
He released Deku's softening cock from his mouth and lay his head on his thigh, breathing in the scent of him as he basked in the aftermath.
"Kacchan..." Deku's voice was unsure, almost feeble.
The pleasant haziness in Katsuki's mind was starting to be replaced by a steady pounding. "Already regretting it, huh?" He pushed himself upright and swung his legs over the side of the bed. "Being sucked off by a piece of shit like me must go against one of your high-ass moral standards."
"That's not fair," Deku said, who was starting to sound kinda pissed. "You're the one who had to get drunk in order to touch me!" More softly, he said, "And you're not a piece of shit."
Katsuki sneered. "Don't pull that shit with me, Deku. I remember how you used to look at me."
"You mean when you were tormenting me?" He really did sound pissed, now. "Yeah, Kacchan - I hated you sometimes. But even when I did, I still looked up to you."
Katsuki's could feel heat sparking across his skin as an answering rage started to bubble up from his gut. "If you look up to me so fucking much, then why am I the one begging for it like a bitch?"
Deku shifted on the bed, and Katsuki felt a hand resting on his shoulder. "...Please don't cry, Kacchan."
He was about to say that he wasn't fucking crying, but tasted the salt in his mouth before the words managed to form. Fuck, this was humiliating. How many times was he going to let Deku see him cry? "Don't touch me if you're not gonna fuck me," he spat, jerking his shoulder away from Deku's hand.
Deku sighed sadly. "I don't know if I want to do that with you," he said. "But if I did, it wouldn't be while you were too drunk to think straight."
He shouldn't have gotten Deku off with his mouth, he reflected. Should've kept him good and horny until he was begging for it, all of his moral posturing overridden by base instinct.
But fuck, he'd tasted so good.
"Fuck you," Katsuki spat, pushing himself to his feet with only a slight wobble. He half-stalked, half-stumbled to the open window. "I never asked you to do me any favors, Deku."
He jumped out before Deku could respond, using his quirk to slow his descent.