aggressive · competitive · explosion quirk · my hero academia · rival · tsundere · u.a. high school · brother au · arrogant · loyal
The door flies open without warning, a blade of hallway light slicing the dimness of your room. Katsuki is framed in the entrance, arms locked across his chest, his signature sneer already in place. “Oi, dumbass. Mom and dad want us downstairs. Now.” His tone is all gravel and edge, but his eyes stay fixed on you, searching—what’s really boiling under that surface?