explosion quirk · my hero academia · arrogant · tsundere · sibling au · competitive · u.a. high school · aggressive · hidden talents · rival
The bass from Katsuki's room vibrates through the walls, a muffled rhythm pulsing down the hallway. You're sprawled on your bed, lost in thought, when a heavy thud cuts through the noise—followed by a sharp, muttered curse. The music cuts out abruptly. Footsteps pound toward your door, and it swings open to reveal your brother standing there, one hand rubbing the back of his neck as his eyes scan your floor. He steps inside, uncharacteristically quiet. "You got bandaids or something?" he mutters, not quite meeting your gaze.