Work Text:
Katsuki wasn’t even supposed to be there; he was just a rookie hero and this mission was meant for seasoned heroes who’d been in the field for longer than he’s been alive, too high stakes for someone who only graduated eight months ago. Yet somehow, Katsuki was there, standing among people much broader and much taller and much more capable – maybe their physical differences weren’t as great as Katsuki was imagining in that moment, but he hated how he felt like a child surrounded by these people. He hated how they looked at him as if he was a child, as if he didn’t have a place or a right to be here.
It was bad enough that he had to get on a plane in the middle of the night and travel for a solid twelve hours to even be here, but having to be surrounded by judgemental assholes like these on top of it was pissing him off.
But Katsuki knew better – he knew he was more capable than all these fuckers put together and he knew he would end up proving them all wrong and showing them how crucial he was to this mission. He didn’t feel out of his league being here because he knew for a fact he’s seen and done a lot worse than most of the people here; because when push came to shove two years ago they weren’t the ones laying down their lives at the front lines, Katsuki and his classmates were the ones doing the heavy lifting. So he refused to cower in front of their judgemental stares and he refused to shrink himself to fit their underestimating expectations.
Still, being alone in a sea of unfamiliar faces wasn’t a comfortable feeling for him. It wasn’t like he needed anyone to coddle him or hold his hand through the mission, but it would have been nice to know at least one person there.
“Bakugou.” A familiar voice spoke up behind his back; a voice he hasn’t heard in the eight months since he’s been away from school. He never thought he’d feel a shiver running down his spine because of that voice or because of the images it brought up.
He turned around slowly and came face to face with his old teacher, who looked as unimpressive as ever with his unruly hair and passive expression. But seeing him made Katsuki’s stomach clench uncomfortably anyway. It wasn’t like he thought he owed Aizawa anything – even though he knew he owed him everything but still denied it to himself so he wouldn’t have to deal with feeling guilty – but he knew it was kind of shitty of him to cut contact the way he did. Not that Aizawa ever tried to reach out to him; Katsuki had no idea if any of the others were still in contact with their old teacher. He wasn’t talking to any of them much these days either.
He told himself they all drifted away from each other naturally; they were heroes now, working for different agencies or trying to break through the ranks, or even fucking off all the way across the world to chase some dream that was bigger than all of them. Katsuki knew nobody blamed him for not checking in, not when none of them did a very good job of doing it either. And he refused to feel guilty about putting his own path above social pleasantries with people who probably didn’t care about him past the fact they finished high school together. But something about his teacher had always made Katsuki feel a strange mix of gratitude and guilt – maybe it was all the times Aizawa had stuck up for him when no one else gave a shit, or the fact the man had come to his hospital room and watched Katsuki cry when Deku left and he was the one who told him it would be okay and they would fight to bring Deku back.
Remembering that night made Katsuki want to throw up, so he quickly squashed those feelings down and looked up.
“Didn’t know you’d be here, too.” Katsuki said instead of greeting the man. Aizawa just shrugged, like it made no difference to him if he was going on a life threatening mission or spending his afternoon reading the newspaper, or whatever the fuck it was old people like him did in their spare time.
“I got a call from Ectoplasm. Said they could use my quirk for this thing.”
“Same here.” Katsuki muttered.
He cast another glance behind his back at the gathered heroes. None of them were any big name heroes he knew personally, but Katsuki noticed immediately they brought a big variety of quirks that would come in handy for this.
“You know what we’re up against here?” He asked suddenly, looking back at Aizawa. It was only too natural to him to turn to the man for guidance again, as if he’d never left school at all.
“I know about as much as you do. A group of villains doing quirk experimentation, turning into mutants.” Aizawa let out a heavy sigh and shook his head. “Truth is, we don’t really know what we’ll find down there. There isn’t enough intel for us to go in and be sure what we’ll find, but letting their operations continue would be a mistake. It’s why there’s so many people here with all sorts of quirks.”
Katsuki nodded in understanding. It made sense – they needed as much diverse arsenal of quirks as they could get, because they wouldn’t actually know which powers would be useful and needed until it came down to it. But the more Katsuki thought about it, the more it made sense for Aizawa to be there. Even though he didn’t have a quirk suited for fighting like Katsuki, he was an almost irreplaceable asset to the heroes because his quirk was usable in every situation and against almost any villain.
There were exceptions; those who chose to fight with weapons more than quirks, where Aizawa was at a disadvantage because erasing their quirks didn’t render those villains useless. But it wasn’t like Aizawa was useless in a quirkless fight either.
Before Katsuki could get too lost in his thoughts, they were called to gather round for a last briefing before the operation would start. Their goal was simple: take out the villains as quickly and efficiently as possible and try not to get killed in the process. It was an unspoken rule that they shouldn’t leave any dead bodies behind on the villains’ side either, but if it came down to a choice between saving themself or sparing a villain, all of them knew what they’d end up choosing.
With that grim thought hanging over his head, Katsuki followed the others and got into position. Hopefully this shit went well.
It didn’t go well.
Katsuki had no clue when things started getting out of control or what exactly happened, but before they knew it, they were outnumbered. There were far more villains in that hideout than the heroes anticipated and it turned out, they had civilian hostages. It wasn’t clear to Katsuki if those people were being held there as test subjects or some sort of insurance in case heroes came knocking down the door, but it pretty quickly became obvious their objective had changed. Nobody cared about the villains anymore, the priority now was to get the hostages out and get out of there as fast as they could.
That was a lot easier said than done, though.
Somehow Katsuki managed to knock out three of the villains who were guarding a terrified girl and pried her away from the commotion. He didn’t look to make sure his colleagues were okay or that the other victims made it out; his first priority now was to get that girl to safety and then he could worry about the rest.
“Wait!” She shrieked at him and tried to pry herself out of his grip. “Wait, you can’t – I have to go back for my sister!”
Katsuki blinked and looked back. “There’s other heroes there, they’ll bring her out.” He said. “We need to move!”
“No, you don’t understand! She can’t control it, I have to go get her!” And with that, she yanked her arm out of Katsuki’s grip with a yelp and turned to run back into the commotion.
Katsuki cursed under his breath and ran after her. “Fucking shit.” He scanned the area until he found the girl again and ran after her. Somehow, everyone else ignored her and she managed to get through the crowd completely unscathed despite the fighting around her.
Katsuki caught up with her and managed to grab her before a villain with a weird knife quirk cut her head off. She yelled and stared at where the knife passed with wide eyes. Katsuki could immediately tell that quirk was a mutation but he didn’t stop to dwell on it.
“Are you crazy?!” He yelled, completely ignoring the proper protocol. Fuck being soothing to some suicidal civilian. “You wanna get killed or something? We need to get out of here!”
“Yumi!” The girl yelled, completely ignoring Katsuki. “Yumi, I’m here!”
Katsuki looked up and saw another girl – who looked a lot like the one he was currently forcing to keep still. The girl across the room looked even more frightened, too scared to move an inch in case she got caught in the crossfire of quirks and fighting.
“Stay here. I’ll go get her.” Katsuki said. “ Don’t move.” He didn’t stick around long enough to hear what she said – she yelled something after him but he ignored her words in favor of propelling himself up over the crowd and towards the girl cowering in the corner.
Except he was so focused on looking at her as a target, he didn’t notice someone else had moved for her at the same time. Katsuki collided with someone mid air but managed to right himself before he fell to the ground. He wasn’t sure if the other person was friend or foe, so he was immediately on guard as he looked up and readied himself to defend and attack.
“Shit, kid.” Aizawa muttered, rubbing his side with a frown. He had one arm around the frightened girl and his cloth half wrapped around her as if he wanted to pull her out of the corner. “I’m not made of rock, you know.”
“Coulda fooled me.” Katsuki muttered. He refused to wince but colliding with Aizawa had not been painless for him either.
“Oh, no… What did you do ?”
Katsuki whipped his head around and saw his initial civilian standing there, looking at them with wide, terrified eyes.
“What the fuck?” He snapped at her. “I told you to stay put, you little shithead!”
“Mako-chan!” The girl Aizawa was holding onto leapt towards the other girl and was caught in a tight hug.
“It’s alright, I’m here now. We need to get her out of here before she hurts someone else.” The girl – Mako – gave them both a pained look before looking down at her friend again.
Katsuki didn’t waste time arguing that neither of them were hurt at all or asking what the fuck she was talking about. He grabbed them both at once and started pulling them towards the exit. By then, a lot of the villains were either incapacitated or had fled from the scene, but Katsuki saw that some of the heroes were down on the ground too. He didn’t stop to assess the situation; he couldn’t, not until these two nuisances were safe.
Katsuki has never been so glad to be out in the sunlight before. He could feel Aizawa lagging behind him but didn’t turn to check on him out of respect. Instead, as soon as they were far enough away from the fighting, he rounded on the two girls and pointed an accusing finger at them.
“Okay, what the fuck?” He snapped. “Did you wanna get yourself killed? I told you we had it handled!”
“Bakugou.” Aizawa’s voice sounded like an animal growling as he spoke. Katsuki turned to look at his former teacher and found him glaring daggers. “I thought your manners improved more than this. They were scared for each other. You can’t yell at civilians like this.”
Katsuki knew he was right – and he immediately felt shame and regret because he had gotten better than this. He wasn’t that person who yelled and lost his temper with people anymore, especially not with civilians. But somewhere in the back of his mind, a memory prickled at his brain, of a reckless friend running head first into danger with no regard for his own safety, just like this girl had done now. Shit. When did he become such a fucking pushover?
“No, he’s right.” Mako said shakily. She had her arms wrapped around Yumi tightly but was looking up at Aizawa with frightened eyes. “I shouldn’t have gone back, I know it was dangerous. But I couldn’t leave her.”
Aizawa sighed; he looked like he was barely resisting the urge to run a hand over his face. “We get it. You were just worried for your sister.”
It was the first time Katsuki actually considered the possibility that those two were sisters, but now that he looked at them again, he could see the resemblance.
“Yes, but…” Mako took a shaky breath and let it out slowly. “I’m sorry. Yumi can’t control her quirk and I didn’t want her to hurt anyone.”
“It’s fine. We’re not hurt.” Katsuki shrugged, trying to make up for his earlier outburst by being reassuring now.
“You don’t understand. They did something to her – she didn’t used to be like this.” Mako said insistently. “Yumi’s quirk is dangerous. If you touched her… It will kill you.”
Well. That was a fucking downer.
“What– what do you mean?” Katsuki was immediately seized by dread at the words and he looked at Aizawa pointedly. “Do you feel sick or something?”
“No more than usual.” He said flatly.
“See? He’s fine.”
“No.” For the first time, Yumi poked her head out of Mako’s embrace and looked at them. Her eyes were such a pale blue Katsuki felt a cold shiver run down his spine. “You’re fine now but it will kill you slowly. I’m sorry. I tried to get away so no one would touch me.”
Katsuki felt his stomach squeeze uncomfortably. “What the fuck is–”
“What’s your quirk?” Aizawa asked. He seemed strangely calm considering they were both just told their days are numbered.
“They call it succubus, I got it from an experimental drug. I can almost control it now but when I get emotional it’s too hard.” She said, almost apologetically. “It works through touch, see? Whoever I touch will die in 24 hours unless…”
“Unless what?” Aizawa pressed.
“You have to have intercourse.” Yumi said the words steadily even though her pale face flushed a deep red. “It’s, ah… Like an antidote.”
“What? That’s the craziest thing I’ve ever heard! No way that’s true.” Katsuki snapped immediately. Were these girls crazy? Did they seriously think he’d believe this bullshit?
“It’s true! I’m sorry, okay? I didn’t mean for you both to touch me.” Yumi said desperately.
“How come you can touch her then?” Katsuki said and pointed an accusing finger at the sisters. “You’re touching her right now. Does that mean you’re gonna die too?”
“Actually, my quirk is a shield.” Mako said calmly. “You can’t see it, but I can produce a thin layer of protection all over my body. I used to only be able to do it on my hands, but with the drugs… Well, anyway. I’m immune to most physical quirks that would normally cause harm.”
“Well that’s just super fucking convenient for you.” Katsuki muttered. Mako gave him another apologetic look. “Are you hearing this shit?” He asked, looking over at Aizawa.
“Unfortunately.” The man muttered.
“What’s he supposed to do then? Just find someone to get off with or he’ll die?” Katsuki demanded. The thought of all this made him uncomfortable and nauseous – for multiple reasons.
Yumi bit her lip, looking guilty. “Well…”
Katsuki was going to die. But not because of that shitty quirk – no, he was going to die of fucking embarrassment . It was bad enough having to stand there while the effects of the weirdass quirk were explained to them in excruciating detail, but then Aizawa had just resigned himself to dying as if the thought of being close to Katsuki repulsed him so much he’d rather take his chances with keeling over than touch him.
Because apparently, it wasn’t as easy as just fucking a random person and getting it over with to survive this. According to Yumi, it couldn’t be just anybody – it had to be someone you cared about. Someone you had a connection with. And as much as Katsuki wanted to deny it, as much as he fought against the urge to cling to the idea of Aizawa actually caring about him, he knew that it was true. It might be a parental sort of care, a mentor relationship that grew over the years they spent together in school but it was a connection anyway and that was more than Aizawa could claim to have with anyone else in this god forsaken town. Except, he was adamant on not using the only lifeline he had in the situation.
“What the fuck is your problem?” Katsuki yelled – he couldn’t help himself, he was getting desperate. “You heard what that girl said. You’re gonna fucking die if we don’t do this.”
“Then I guess I’ll die.” Aizawa said. For the first time, his voice sounded cold and resigned instead of passive and Katsuki wasn’t sure what to do with that.
“Are you seriously so fucking stubborn you’d rather die than fuck me? You do know we’re talking about actual death here, right? It’s not a fucking sleeping pill you’ll wake up from in a few hours.”
“I know the situation, Bakugou. I was there.” Aizawa muttered. His fingers twitched around empty air like he wanted to reach for something that wasn’t there.
“So what’s the fucking problem? Why won’t you–”
“I won’t have sex with my student.” Aizawa growled and glared at Katsuki from across the room.
They were in a shitty hotel room Aizawa rented when they couldn’t go home. They’d already lost about six hours sticking around at the scene to make sure everyone made it out, and then there was the fucking protocol to worry about. Aizawa hadn’t told anyone there about the quirk and Katsuki followed his lead, so he was the only one who actually knew what happened; what was going to happen. He was the only one who had to carry the weight of that ugly truth with him.
“I’m not your student anymore, old man.” Katsuki said through gritted teeth. “In case you forgot, I graduated eight months ago.”
Aizawa lifted his head and looked at Katsuki with tired eyes. “I didn’t forget.” He said, his words almost a whisper.
“Look… I can’t do this, okay?” Katsuki sounded like he was pleading, but at this point, he might as well be. “I can’t watch you die , okay? I can’t fucking – I can’t not do anything if there’s something I can–”
“You can’t help me.” Aizawa said coldly. He might as well have struck Katsuki with a fist.
“What?” He asked, in a voice much smaller and much more fragile than his own.
“You can’t help me with this?”
“What, you’re saying you don’t give a shit about me?” Katsuki snapped defensively. “Bullshit. That’s bullshit.” Even to his own ears, he sounded like he was begging Aizawa to deny the implication.
Because the truth was – the truth Katsuki never dared to admit, not even to himself when he was alone in the dark and plagued by guilty thoughts these stupid feelings brought on – that he cared. Sometimes it hurt him how much he cared; sometimes he wondered if it was normal to care so much for a guy who was twice his age and who was his damn teacher . He never came to an answer he actually liked when his thoughts would spiral in that direction, so he chose to bury them and not think of it at all instead. But at times, at times like these when he was feeling vulnerable and exposed and like his feelings were written all over his face, it was hard not to think about it.
“Of course I’m not saying that.” Aizawa said quietly and Katsuki almost felt like he could breathe again. But not quite. When he finally looked up again, Aizawa looked like he’d aged ten years in the last few minutes. “But do you seriously expect me to take advantage of you like that? What kind of a hero would I be if I did that? What kind of person ?”
Katsuki shook his head. “And what the fuck am I supposed to do? Just sit here and wait until you kick the bucket? And then what? Did you want me to start arranging your fucking funeral, too?”
Katsuki watched rigidly as Aizawa sat there and stared at him, still as if he were made of stone. He was acting like it too; like there was a hardness in his chest that prevented him from feeling anything about this at all, and maybe that was how he protected himself, how he kept himself from falling apart. But Katsuki didn’t have that luxury. He couldn’t pretend – he wouldn’t.
He took three big steps forward and crossed the entire room, then looked down at Aizawa with a hardness of his own marring his face. “I’m not your student anymore, so you can’t tell me what to do.” He said forcefully. “And I’m not a kid, either.”
And then, before he could think better of it and before Aizawa could realize what he was doing and stop him, he threw himself down on the man’s lap and smashed their lips together. It had to have caught Aizawa off guard, because he made some kind of choked sound in the back of his throat and went completely still under Katsuki – but Katsuki just used that to his advantage and deepened the kiss, steadying himself in Aizawa’s lap. After a moment, he felt the older man move his hands and he already prepared himself for the fight he’d have to put up if he was suddenly pushed off; but Aizawa didn’t push him off. He wrapped his arms around Katsuki’s waist and kissed him back with the desperation of a dying man, like he thought he could get breath into his lungs only if he sucked it out of Katsuki’s mouth.
Katsuki’s head started spinning at that point, either from lack of air or from his own disbelief that this was actually happening, or because Aizawa physically lifted them from the chair and was carrying him across the room. Katsuki only realized it happened when he landed on the bed and he blinked his eyes open to look at Aizawa – but it wasn’t his teacher that he saw looking back at him; it was a man possessed with desire, staring down at Katsuki as if he couldn’t believe he was doing this, as if he thought he was condemning them both to something terrible because of his own weakness.
Aizawa crawled over him and cupped Katsuki’s face in his hand, so gently the touch might not have been there at all. Katsuki looked up at him and swallowed thickly.
“Are you really sure about this?” Aizawa asked him quietly. If Katsuki didn’t know better, he’d think he saw pain behind the man’s eyes. He nodded slowly and let out a shaky breath.
“Of course I’m fucking sure.” He said immediately, before Aizawa could start thinking Katsuki was changing his mind. He reached up slowly and put his hand on Aizawa’s face, mirroring the other man’s touch. “It’s okay.”
The position they were in felt too familiar, too intimate; it made Katsuki’s stomach twist with guilt and longing so he used his free hand to grab the back of Aizawa’s neck and pull him down for another kiss to squash those traitorous feelings. He was thankful when Aizawa didn’t resist it, when he even kissed Katsuki back like it meant something other than salvation. Under the whirl of confusing feelings in Katsuki’s chest, guilt was most prominent – because he knew a part of him was being selfish for doing this when he knew his own feelings and he knew he was using the opportunity to feel something he never thought he’d get to otherwise. But maybe he could look at it as a mutually beneficial situation – he would get to have this one time, this one night with the man he didn’t dare let himself care for in all the years he’s known him, and Aizawa would get to not die. And after this, they would go their separate ways again and Aizawa would go back to whatever the fuck he did every day, and Katsuki would go back to hating himself for how he felt.
It was a win-win situation with Katsuki as the loser anyway.
He felt warm hands on his stomach and a moment later he realized Aizawa was pushing his shirt up over his stomach. Without hesitation, Katsuki lifted his arms and let the shirt fall away. Katsuki never gave much thought to being naked in front of another person – he didn’t look at his body and find an appealing or beautiful picture there, he saw the vessel of a warrior that carried a strong quirk and that got him out alive through impossible injuries. He didn’t even notice his scars anymore and he didn’t waste time worrying what someone else might think of them. Now, with Aizawa, he felt safe in the knowledge that his scars wouldn’t be seen as something gross or off putting but as exactly what they were – proof of victory.
Aizawa took him in with hungry eyes and he spent such a long time just staring at Katsuki’s bare chest, Katsuki started thinking he was having a stroke. Then he looked up slowly and took a deep, steadying breath through his nose.
“You’re beautiful.” He said.
It was so unexpected, so utterly surreal to hear those words come from Aizawa’s mouth that Katsuki was left speechless. Aizawa smirked and breathed a small laugh.
“Don’t look so shy about it.” He muttered as he moved a hand down over Katsuki’s chest and stomach, to the waistband of his pants. “I’m sure there’s even more beautiful parts of you I haven’t seen yet.”
What. The actual. Fuck.
He didn’t say anything as Aizawa took off his pants – and underwear – slowly, like he wanted to appreciate every inch of skin that was exposed to his eyes. And then, all of a sudden, Katsuki was laid out completely naked under his former teacher and his dick was hard already and Aizawa was still completely dressed – and Katsuki thought he might die .
He swallowed thickly and struggled to meet Aizawa’s eyes. “I thought… You’re the one who’s supposed to… You know.” Fuck. Fucking shit fuck! Why was he being so damn awkward? He’s the one who initiated this whole thing, for fuck’s sake.
Aizawa raised an eyebrow at him. “If I’m going to hell for this already, I might as well make it worth your while.” He said as he laid fully on his stomach and lowered himself down between Katsuki’s legs.
Katsuki wasn’t sure what he expected from this but it definitely wasn’t having his dick in his teacher’s mouth. He gasped far too loudly as Aizawa wrapped his mouth around him and then pushed down and Katsuki felt wet, hot lips wrap around him all the way to the base and holy shit , Aizawa’s lips were actually pressed to Katsuki’s pelvis and the tip of his dick was in his throat and Katsuki was pretty fucking sure he was about a minute away from actually passing out. If that wasn’t bad enough, Aizawa proceeded to swallow around him and that just made everything so much tighter and Katsuki couldn’t have held on if he tried.
“Oh– fuck!” He cried out, too overwhelmed to care how high pitched and desperate his voice came out. He didn’t even have the breath to warn Aizawa that he was about to come, he just shot his release straight down the man’s throat with a pathetic whine.
To his credit – or maybe to Katsuki’s delight – Aizawa didn’t pull away or even gag. He swallowed everything effortlessly and then wrapped his tongue around Katsuki’s shaft and licked him completely clean until he was twitching from oversensitivity. Katsuki was barely breathing by the time Aizawa finally pulled off of him and raised a curious eyebrow at him.
“Pent up?” He asked teasingly.
Katsuki hated himself for blushing at that stupid smug smile. “You could say that.”
Aizawa smirked and pushed his hair out of his face – and that honestly shouldn’t have been hot at all but Katsuki still felt his dick twitch against his abdomen at the sight. If Aizawa saw it, he didn’t comment on it; instead he pushed Katsuki’s legs up and apart and gave him one more heated glance.
“Good.”
Before Katsuki got a grip on what was happening, Aizawa was pushing his legs back and lowering his head even further–
“Hey, woah– what the fuck are you– oh my god!” He cried out when Aizawa licked his asshole, all the way from his tailbone to his balls and then trailed his tongue back down and pushed it inside Katsuki. “Oh my god.” Katsuki hissed, already feeling breathless.
He reached down and grabbed a fistful of Aizawa’s hair but he didn’t pull, he just held onto it so he could have some kind of anchor as Aizawa drove him absolutely mad with his tongue. It didn’t take long before Katsuki could feel spit running down his crack and everything was way too fucking wet. Katsuki was hard again within seconds but his cock laid neglected against his trembling abs as Aizawa focused solely on his ass – first just with his tongue and then, slowly, with his fingers too. That part was almost painful and Katsuki was glad for all the spit when Aizawa started to finger him and stretch him open. They had no lube here – at least not any that Katsuki has seen – so spit was all they could work with and as gross as that thought was, Katsuki would take it over a dry fuck any day.
Fifteen minutes later he had three fingers stuffed up his ass knuckle deep and he was drooling and panting like a bitch in heat. At that point, he was ready to do anything Aizawa wanted just to come again.
“Fuck, enough!” He yelled desperately for the third time. “I’m s-stretched enough, just fuck me already!” He lifted his head as far as he could and glared at the man between his legs – which was a bad idea because the sight of Aizawa between his legs made his ass and dick twitch at the same time and there was no way Aizawa didn’t feel that.
“Eager, are we?” Aizawa asked in a mocking tone. But he finally, finally, removed his fingers from Katsuki’s ass and then slowly started removing his clothes.
He got his shirt off quickly and Katsuki almost came dry at the sight – thick, dark hair ran from Aizawa’s chest all the way down to his crotch, where it was thickest and disappeared into his pants. Katsuki’s eyes kept going down and he stared openly at the bulge in Aizawa’s pants. Why the fuck wasn’t he taking them off? He couldn’t bring himself to feel embarrassed about it when he leapt up and started pulling at Aizawa’s belt to get it off, but he was stopped when a warm hand wrapped around his wrist. He looked up, confused, and saw something he never thought he’d see on Aizawa’s face – uncertainty.
“Kid…” He sighed deeply and finally glanced at Katsuki again. “If you’re having second thoughts–”
“Do I fucking look like I’m having fucking second thoughts?” Katsuki snapped and tried to slap Aizawa’s hand away. “I already told you it’s fine. Why are you–”
“It’s not about…” Aizawa pressed his lips together tightly and let out a long breath through his nose. “I don’t have a fucking leg, I can’t… I don’t expect you to want to see that shit.” He muttered, almost under his breath.
Katsuki sat back on his heels and watched him for a moment. He kind of wanted to hit him, but he thought he might end up regretting that.
“Are you really that fucking dumb?” He said instead, which seemed like a much better option. “You seriously think I’d be bothered by that? We’re heroes, we both know what that shit means. Beides, I already knew you only got three functioning limbs and I still wanted to fuck.”
Aizawa scoffed and glared at Katsuki weakly. “You’re really something, you know that?” He sounded almost fond as he said it and Katsuki hated how his heart did a flip in his chest.
“If you’re worried about me judging then fucking stop it.” He said. “I’m not that shallow. If you’re worried about something else… I can do the work.” He mumbled more shyly.
Aizawa raised an eyebrow at him again – fuck, why did he keep doing that? And why the fuck did he look so sexy when he did it? Condescending bastard.
“Oh? And here I thought you’d be a pillow princess.”
“Shut the hell up.” Katsuki muttered, blushing all the way to his ears.
Before he could do or say anything even more embarrassing, he shuffled on the bed and pushed Aizawa down onto his back, then helped him get his pants and underwear off. He tried not to stare at his dick, partly because it was fucking huge and partly because he really didn’t want to embarrass himself again by drooling over it like he wanted to eat it. Which he kind of did. Fuck.
“Do you want this off?” He asked in a quiet voice, pointing to Aizawa’s prosthetic leg. It looked like it was sturdy and it definitely did the job of getting him to move, but Katsuki couldn’t imagine it would be very comfortable during something like this.
“You don’t have to.” Aizawa said in an equally quiet tone.
“Shut up.” Katsuki muttered then and gently put his hand on the prosthetic. He lingered over it in case Aizawa told him to stop, but when he said nothing, Katsuki pulled gently until the fake leg came off. He placed it down on the floor beside the bed and then slowly climbed onto Aizawa’s lap.
“Hey there.” Aizawa said casually. He actually smiled a little – or maybe Katsuki just imagined that.
Katsuki swallowed and took a deep breath before leaning down to press their lips together. This time the kiss was slow and deliberate, with emotions poured into it that Katsuki had no idea how to give voice to. But he wanted Aizawa to know it was okay; all of it – the situation and the outcome, and his stupid leg and the fact that Katsuki was about to lose his virginity with his former teacher so he could keep him from dying. It was all completely fucking okay.
The only thing that wasn’t okay was that Katsuki would have to pretend none of it happened later. But he wouldn’t think about that now.
He wasn’t sure which of them moved first but while he was distracted with the kiss, somehow the tip of Aizawa’s cock pressed against his entrance and then he was slowly sinking down and the stretch was almost too much but not enough at the same time. When he bottomed out, he gave himself a moment to adjust and breathe. He felt Aizawa lace their fingers together and squeeze his hand and he opened his eyes to look at him.
“Take your time.” He said gently.
“I’m fine.” Katsuki breathed out.
He moved his hips experimentally, slowly, and soon he gained a steady rhythm that made them both groan. His nails dug into Aizawa’s fingers as he held onto the man’s hand for dear life. Overwhelming pleasure washed over him, pleasure like he’s never felt before in his life, like he never thought it was possible to feel – it all crashed into him like a tidal wave and swept him up and before he knew he was completely lost. He didn’t notice when their lips met again but the next time he closed his eyes he was kissing Aizawa breathless and wrapping his arms around his neck to pull him closer and keep him there, like Katsuki’s embrace might save him from whatever bad stuff was happening outside of their little bubble.
Katsuki could feel Aizawa meeting him every time he let his body fall down on his dick until something burst inside him and he saw stars. He gasped loudly between their lips and felt Aizawa smile and pull him closer – and then he angled his hips in a way that had his dick ramming into that spot repeatedly and ruthlessly until Katsuki thought he might pass out. And he did, probably, for a moment; his vision went white and then black and when he blinked there was cum smeared between their stomachs and then Aizawa was groaning into his mouth and pushing his hips up one more time before staying still. Katsuki could feel him trembling under him but he wasn’t loud when he came like Katsuki had been. Still, he could tell that it happened because he felt the warm cum filling him up and sliding down his thighs as they kept moving.
When they both stopped shaking, they collapsed together, still joined at the hips, and waited for their breathing to even out. Katsuki knew he couldn’t stay conscious for much longer; he could feel sleep pulling at him and as he relaxed against Aizawa, he let himself be lulled into the comfort of his embrace, relaxing enough that he could actually drift off. But just before he fell asleep he thought he heard a whisper of something unintelligible, something his mushy brain couldn’t comprehend in the moment – before he could force himself to wake up enough to confirm the words really happened, he fell asleep.
Katsuki woke up in the dark and with an absence beside him that immediately set off alarm bells in his head. He jolted up so violently he pulled a muscle and winced – or maybe the pain shooting through his spine was coming from his ass, he wasn’t sure. Either way, sitting up was uncomfortable, but not any more than the sinking feeling in his stomach when he looked to the side and found the bed next to him empty.
“I’m over here.” Aizawa’s calm voice came from the other side of the room.
Katsuki’s head snapped to the side and he stared at Aizawa with wide eyes. He was sitting by the open window with a cigarette in his hand, a sheet wrapped around his waist. His prosthetic was on his leg again and he was sitting with both feet on the floor.
“Fucking hell. You scared the shit out of me.” Katsuki breathed. He was secretly glad Aizawa didn’t put his clothes back on, because he would have felt a lot more self conscious if he was the only one naked.
“Don’t tell me you were actually worried.” Aizawa scoffed and shook his head. “I’ll start thinking you care.”
“Obviously I care, asshole.” Katsuki muttered and frowned. “What time is it?”
“It’s ten in the morning.”
Katsuki’s eyes widened and his breath stopped, caught in his lungs. “So that means…”
“Yep. I’m still alive, apparently.” Aizawa looked at Katsuki after a moment as if considering him. “Unless I’m actually dead and went to heaven. Would explain why you’re still here.”
“Very fucking funny.” Katsuki scoffed and looked away.
“I’m not joking.” Aizawa put out his cigarette on the outside of the window and threw it out onto the street. Katsuki wanted to snap at him that he was littering, but before he could get the words out, the man was getting up and walking over to the bed. He moved closer to Katsuki and took his face in both hands. “Do you know how happy I was when I woke up and you were next to me?” He asked; there was a desperation in his voice that didn’t match the look on his face. “And then I remembered the only reason you were here is because of what I did to you.”
“You didn’t do anything–”
“I fucking ruined you, Katsuki.” Aizawa spat. The fact he said Katsuki’s name now of all times should have made him feel good, but instead it left a sour taste in his mouth. “How can you ever forgive me for this?”
“Stop.” Katsuki said forcefully. He grabbed Aizawa’s wrist and looked him in the eye firmly. “I have nothing to forgive and you have nothing to apologize for. That shit was not your fault! It wasn’t anyone’s fault, it just happened and I… I don’t regret it. I don’t regret what I did. That was my decision.”
Aizawa shook his head and sighed again. “Because you’re a good person. Of course you wouldn’t have just let me die.”
“No!” Katsuki yelled. “I mean, yes, fuck. But that’s not– Jesus Christ, you’re fucking dense.” He groaned and then, because he had no idea how to explain himself with words, he grabbed Aizawa by the neck and pulled him into a rough kiss.
He opened his mouth and sucked Aizawa’s lower lip between his teeth, pushing himself up onto his knees so he could get closer to him. He didn’t let go or pull away until he was breathless enough that he needed to.
“That give you a fucking clue, old man?” He snapped.
Aizawa must have been seriously caught off guard – again – because he just stared at Katsuki for a long moment without saying anything.
“Oi, are you okay in there?” Katsuki asked, dropping back onto the bed. “I didn’t break you did I?”
“No.” Aizawa breathed out quietly. “Just the opposite.” They stared at each other for a long moment, like neither of them knew how to break this silence now that it was between them.
“I heard what you said last night.” Katsuki finally said. “Or at least… I think so.”
“You did, huh?” Aizawa clicked his tongue and he actually looked like he was embarrassed. “Guess that serves me right for running my mouth like that.”
“I never said I was bothered.” Katsuki said, earning another surprised look from Aizawa. “You know, I never told you this but I used to have a giant crush on you back in school. And maybe I never really got over that.” He admitted, ignoring the blush spreading over his face. “So you can be a coward and tell me you love me when I’m passing out but I’m gonna say it to your fucking face. So just… Deal with it.”
Aizawa stared at Katsuki for a long, stunned moment. Then he blinked and smiled slightly. “Well, are you gonna say it?” He reached out and pulled Katsuki closer to himself until their lips were an inch apart. “Tell me.”
Katsuki’s breathing stuttered slightly but he refused to back down. “I… I love you, too.” He uttered the last word just before Aizawa kissed him firmly and they stayed like that for a long while. When they finally broke the kiss, Katsuki swallowed and took a deep breath. “Also I was a virgin.”
This time, Aizawa laughed out loud. “I know.”
“What, you knew?” Katsuki tried to shove him off but Aizawa just held him tighter.
“I figured it out when you came ten seconds after I put my mouth on you.” He snorted and kissed Katsuki’s cheek gently. “We’ll need to work on your stamina.”
Katsuki scoffed and pressed his hands to Aizawa’s chest, then pushed until he had the man on his back again and was straddling his hips. “How about we start now?”
Aizawa smiled and wrapped his arms around Katsuki before pulling into another kiss. “Sounds perfect.”