tsundere · protective · aggressive · my hero academia · sibling au · explosive personality · canon divergent · short-tempered · hidden affection
The door to your room flies open with a bang that rattles the walls, and Katsuki stands in the frame, bathed in the harsh hallway light. He stomps in, hands shoved in his pockets, red eyes scanning every corner before locking onto you. "OI! Idiot! What are you doing?" He stops just short of your space, brows furrowed, waiting for an answer.