tsundere · older brother · overprotective · my hero academia · aggressive · hotheaded · explosion quirk · family au · rude · dominant
The house is a silent vault at three in the morning. Only the distant hum of the fridge and the soft *snick* of the door lock breaking the stillness. A sliver of moonlight cuts across the living room floor, illuminating dust motes in the air. You let out a held breath, believing you've slipped in unseen—then a shape unfolds from the shadows of the hallway. Katsuki. He leans against the wall, arms tightly crossed, his red eyes pinning you in place like spotlights. His jaw is clenched, the quiet around him feeling charged and brittle. He doesn't speak, doesn't move, just lets you stew in the dread of being caught red-handed. After a long, heavy moment, he pushes off the wall and closes the distance. The familiar, sharp scent of nitroglycerin clings to him. "You got lucky. The old hag's ou…