One of the most dangerous things in the world is not being able to say no to people because you don't want to upset them or dissapoint them. This will completely ruin your life in every way possible, at work, in your private life, your sex life and your friendships. It's a way of removing your own consent in your own decisions and go against your wishes, it is always a crime against yourself. Let yourself have a say. Upsetting people is better than traumatizing yourself.
The first time Katsuki’s body reacted was after a particularly exhausting class spent in a free-for-all brawl. The group of exhausted young men dragged themselves into the locker rooms, peeling sweat-drenched material from tacky, damp skin in preparation to bathe.
He hadn’t even really been paying attention - staring off into space, borderline dissociated due to exhaustion. But, his eyes had fixed themselves on their green-haired target on the opposite side of the room nonetheless. Without realizing it, until his brain finally caught up, Katsuki had watched, unblinking, as Izuku dragged his shirt up and over rippled muscle and marred skin, leaving the expanse of his defined back on full display as he talked animatedly with that half-and-half bastard next to him.
Even when the blond finally snapped back to reality, he couldn’t find the willpower to look away. To not blatantly watch the fucking nerd hook his crooked thumbs in the waist of his pants and push them down tapered hips to reveal a pair of tight, bright fucking orange boxer briefs.
It wasn’t until he felt it. The growing heated pressure straining beneath the confines of his own underwear.
He ripped his eyes away and turned around so quickly his head spun, hastily shucking out of his own ruined gym uniform. Katsuki was a bit confused, somewhat disturbed, and kind of pissed off.
What the fuck was that even about? Sure, their relationship had improved tenfold since everything they’d been through. Dying and being resurrected certainly had a way of putting things into perspective, but popping a semi in the middle of the locker room surrounded by their classmates over another guy - over fucking Deku, was absolutely not warranted. Not in the fucking slightest.