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Katsuki was many things, some could say he was loud, angry, slightly (emphasis on slightly) caring for his friends; however one this he was not is jealous. Katsuki is not a jealous person
The bubbling hot feeling in his gut and face every time his stupid childhood friend clung onto one of their dumb classmates as if he had known them his whole life was not jealousy. It was more of anger, anger at the annoying sight of the green curly haired boy with sparkling eyes and soft so incredibly soft looking lips along with the mass of muscle he had gained over the months of hard training; those same muscles that he used to wrap himself around everyone and nudge his head into their neck like a tired puppy. Damnit. Maybe katsuki was jealous, but thats stupid and no one would have to know that.
Deku had always been clingy, overly clingy for his liking. Ever since they were in diapers the damn nerd wouldn’t let go of him; cuddling into him during nap time and holding his hand dragging him everywhere. Even if katsuki pretended he didn’t like it, it was their thing. Deku didn’t have much friends growing up so katsuki only ever saw him cling to him at least until before everything happened. So seeing him now be so incredibly close with his new friends made him unreasonably angry. He felt as if he would snap one day over this stupid meaningless thing. But it meant so much to him, deep down he knew that one day all these suppressed feelings would come out, he didn’t expect it to be like this though.
You see, katsuki liked going to bed early; by 9pm sharp you would find him locked in his room sound asleep in the comfort of his own bed. The issue was that it was currently 11 pm, yes it didn’t matter to him that it was in fact Friday night and his class wanted to have a dumb movie night and stay up all night,he wanted to sleep.
Thats how he found himself angrily stomping down the stairs into the obnoxiously loud common room littered with his classmates, snacks all over the place as laughter echoed across the room. And there he was, deku. Sitting on the couch as comfortable as ever was his childhood best friend head buried into todorokis chest as uraraka sat next to him and gently pet his hair.
Suddenly that bubbling feeling in his stomach came back stronger than ever before, he could blame it on his tiredness or the annoyance he felt with all the noise but nothing could explain what he was feeling right now. He felt his palms sweat and his face heat up, because he wanted that to be him instead, he wanted deku to cling to him and forget whatever damn thing he said before in middle school to make him stop looking for his physical affection. So katsuki did the only thing he knew how to do.
“Deku.” Katsuki spoke as he walked over to the couch, “spar with me, now.”
“whaa- kacchan! but we are watching a movie! And it’s late! “
“Damnit deku just come, I cant sleep and dumbhair is too annoying to spar with right now.”
And thats how he found himself walking next to deku skin itching to feel his touch once again, as soon as they entered the arena the tension could be felt around the entire building. He held his fist tight and threw the first punch.
deku was as good and glorious as ever, dodging and kicking with that determined look in his face katsuki got lost in. Every graze of skin ever so slightly felt like spark to him, each powerful kick and punch deku threw felt like sweet hugs and kisses— every dodge he made felt like a stab through the gut.
They went on like this for 20 minutes, punching and dodging getting lost in eachother. But katsuki wanted more, he needed more. and he finally snapped, as deku was going for a high kick he hit him with a leg sweep and pinned him under him hands tightening around the mass of muscle under him.
Dekus eyes widened, looking intensely at him as they heavily breathed in exhaustion. “kacchan..whats-“ and then katsuki collapsed and held onto him. The connection of skin felt like fireworks on a dark night. It hit like sweet relief, like everything he had ever dreamed. And then Izuku held him back.
“Izuku. Don’t let go”
“Kacchan..” izuku said to him tearfully holding on tighter.
And so they stayed like that for a few minutes, taking everything in. It had been years since the two boys were physically this close to eachother. Neither of them admitted it but the itch was always there, and the only cure was eachother, no matter how much they denied it.
Finally katsuki let go and sat up locking eyed with izuku who looked at him like he hung the moon and the stars.
“Listen deku I just, I cant explain it its so fucking stupid and I guess, it just pisses me off. I hate how you cling to them, how you constantly look for them and how they hold you. Why don’t you cling to me instead.
Katsuki suddenly felt that warmth again, except this time it felt like he would actually explode as dekus soft lips landed on his with a clash and they tumbled back down with a crash.
He held his arms around the boys waist tightly, never wanting to let go and a pair of cold hands wrapped around his face as if he needed to hold on for survival. This heat lasted for a few seconds until the lifeline ended and deku stared at him with those eyes again.
“Kacchan, all ive ever wanted to do was hold on to you, ever since we were kids its always been you, you’re the one I want to hold on to. Every time you pushed me away it felt like burns on my skin, so I stopped and I looked for a cure in my friends, I would treat their touch like burn cream but It would never fully heal. Because I need you kacchan.”
“Im sorry, izuku. You’re all Ive ever wanted. All my life ive pushed you away from pure insecurity. Seeing you hang to them burns me more than my pride though. So cling to me, deku.”
They both walked back to the dorms with a smile on their face that night, and if they got caught cuddling together late at night on the couch, well then the idiots should mind their damn business.