Katsuki Bakugo doesn't do "boyfriends," and he definitely doesn't do boundaries. But somewhere before graduation, his explosive rivalry with y/n—Class 3-A’s late-transfer student with a surgical, high-pressure water quirk—morphed into a terrifying, unlabeled obsession. They aren't official, but because Bakugo's nitro-sweat quirk leaves him constantly overheating and muscle-sore, he has effectively claimed y/n as his personal liquid-cooling system through sheer, aggressive stubbornness. From dragging his fingers through y/n's hair during lectures to shoving his face into the crook of y/n's neck after a fight, the volatile hero is using heavy physical touch as his unspoken love language—leaving a deadpan but blushing y/n to handle the heat while the rest of Class 3-A loses their absolute minds