Chapter Text
Katsuki was fucking tired. He wouldn’t dare to admit this to anyone, though. He had a fucking reputation, and image, to keep. So he kept his face firmly settled in a scowl, his hands deep in his pockets, and walked home. He was pushing thirty hours awake, and, usually, he wouldn’t do this but this was an abnormal situation. He was undercover for about a month now and finally, they had been able to bust the drug cartel and apprehend all the contraband that had arrived via sea this night. Or was it the night before? Katsuki wasn’t sure how to phrase it, his sleep-deprived brain struggling to understand time right now.
To top it off, he had to go back to his agency and fill out a fucking month worth of paperwork since he wasn’t able to do it during the undercover mission. When he had finally finished it all, he didn’t even change from his hero suit to his civilian clothes - only his gauntlet was off, secured on his office. He just wanted to go fucking home, take a shower in his own bathroom, put on his soft pajamas and get the fuck into bed and sleep the whole day away he was so tired.
Home. A funny thing to think, for sure. If he told his teenager self he would call home a place he shared with Deku of all people, he was sure gonna get an explosion to the face - being himself or not, his teenager self was a damn brat and would not accept it.
It took a long time - and a lot of therapy sessions - for the blonde to accept he didn’t actually hate Deku, and that he was his friend. It took a few more fights between them before Katsuki understood that Deku didn’t look down on him, and that he was just a fucking selfless care-too-much kind of person.
When they graduated and almost all of their friends were planning to go and live together, as friends or couples, it was the most rational thing to do too. But Katsuki knew he wouldn’t be able to deal with anyone other than Deku living with him. Living in the dorms was a very unpleasant experience, his patience being tested daily. The idiot brigade, self-titled ‘Bakusquad’, being the ones that seemed to make him explode the most. During the three years they all lived together there was one too many ‘fire drills’ caused by his explosions. The reasons varied, from pranks Dunce Face and Pinky played on him to fucking Half-and-Half testing his patience to Deku, well, being Deku .
Katsuki was so distracted thinking about his high school years and how much he had grown up to notice he was already on the sidewalk leading to his building. He shook his head, ordering himself to get a fucking grip, and entered the lobby.
He took the elevator to his and Deku’s shared apartment instead of the stairs - usually, Katsuki would go up to their floor through the stairs so he would have the extra workout, but he could give himself this laziness right now. He fucking deserved it after all the shit he put up with on the last month, and all the fucking paperwork he filled in the last six fucking hours. He walked inside the metal box and took a deep breathe, thinking about what the fuck would Deku be doing. ‘ Probably gonna be awake doing nerdy shit without me there to make him have a sleep schedule’ he snickered, it was the middle of the night, half past two already, ‘ The idiot probably had take out the whole month too’ .
Another thing that was normal now and would send his brat teenager self into a fit was him cooking for Deku and taking care of him. But he was 23 already and could actually suck it up and admit Deku was his best friend. On his head. He never said the words out loud, even though his therapist tried to convince him it would be good for him to do so. He had changed, but not that much . He did show Deku he cared through his actions and the nerd had been by his side, or running to catch up to him, for too long not to know it.
When the elevator doors open on his floor, Katsuki steps out and walks the few meters between him and his apartment door lazily. He uses his thumb to open the door, something Deku had talked him into even though he thought it was fucking useless because a key would do the same shitty job, and walks into the small genkan only to immediately freeze on the spot.
‘Are these… moans?’ Katsuki thinks, listening harder to the sounds - sounds that are coming from the direction of the bedrooms. ‘ Huh, the nerd does have a sex life after all. Not that I would like to be listening to it, though’ he muses, lowering himself to take off his heavy hero boots, only to stop mid-action again and listen harder.
“STOP! Pl-please, Sir, please… it’s hurting me, p-please…” Deku’s voice carried through the mostly empty apartment, making Katsuki’s blood freeze on his veins.
‘ What the actual fuck!? Is he being attacked? He’s being hurt!?’
“You’re nothing more than a slut, you don’t decide shit here, so stop complaining and TAKE IT!” another voice responded to Deku’s pleas, followed by the sounds of flesh being hit, “You’re strong enough to take it, aren’t you, you useless whore!? Or is the hero Deku too weak to take this!? I’m not even tired yet, you fucking useless stupid slut!”
“N-no!” Deku’s voice pleaded again, and Katsuki was still frozen mid-lowering himself to the ground, eyes widening with every word he listened, “Yellow! I can’t take it, I’m sorry, stop it, yellow! Please, please, s-stop it! Yellow!” Deku’s sobs sprung the blonde hero into action, forgetting he was still in his boots, sprinting to Deku’s bedroom. An instinct on the back of his mind making him react to that word, yellow , and just act. ‘ It couldn’t be, right!? There’s no way! I would know if Deku… if he…’ he thought, alarmed, and urged his body to move faster.
“You’re a fucking useless slut, can’t do anything right! You can take it, I know you can, whore! So stop crying and be what you are best for, and take it! You don’t get to decide if you can or not take it, slut!”
“RED! Red, red, red!” Deku cried out, and when he Katsuki barges into the bedroom sees what’s happening he freezes again. His blood is somehow frozen and boiling at the same time, his eyes wide and not believing what he’s seeing.
Deku is cuffed to the bed with fucking quirk-nulling handcuffs. His face is pressed to the bed, exposing his back and ass to the man standing on the end of the bed, eyes wide and locked on Katsuki. He’s holding a cane on his right hand, and it’s pretty obvious what he was using it for.
Deku’s back is filled with marks, and it’s fucking bleeding at some parts.
He has a plug on his ass too, ass that is red and bleeding as well. His tighs aren’t bleeding but have way too many bruises in it. Katsuki can’t believe what’s in front of him, the fear spreading through all of his body coming from his chest paralyzing.
“What the fuck do you think you’re doing!?” Katsuki asked, voice low and menacing. He was beyond furious, vision hyperfocused on the asshole holding the cane, as if Deku’s blood took over his vision and painted everything red, the edges fading into black as the seconds passed. It felt like hours he glared at the man hurting Deku, his brain refusing to call him what he supposedly was. He didn’t deserve that tittle.
Deku’s sobs were still there in the background, pleadings for mercy, apologies and that word, ‘red’, being said over and over again. And it was Deku’s begging that sprung him into action once more. The wrongness of it making him want to kill the bastard that caused it.