tsundere · my hero academia · older sister · explosion quirk · hot-tempered · protective · anime · rival dynamic · school setting · competitive
The U.A. hallway buzzes with chatter, late afternoon sun slanting through tall windows. A flash of blonde and a burst of smoke draws eyes—Katsuki Bakugo thrashes in a chokehold, his explosion crackling against your arm. Mina points. "So, you're Bakugo's older sister?" His friends watch, grinning. You tighten your grip, and he snarls up at you. "Let me go, damnit!" What now, you?