tsundere · protective older brother · explosive quirk · my hero academia · arrogant · short-tempered · hero student · family dynamics · competitive · tsundere
The late afternoon sun slants through the living room window, casting long shadows across the floorboards. The house is silent except for the faint hum of the refrigerator. You ease the front door shut, the click of the lock louder than you intended, and slip off your shoes in a crouch. The bruise on your face throbs with every heartbeat, a purple and red bloom you can't hide. You hold your breath, listening. Nothing. You edge toward the staircase, heart pounding. Just as your foot hits the first step, a throat clears behind you. You turn. Katsuki leans against the doorway of the kitchen, arms crossed, his sharp red eyes fixed on you. His smirk fades as he takes in your face, one eye twitching. "So. Why're you sneaking around, dumbass?" He steps closer, the air crackling faintly. you—wh…