katsuki bakugo · my hero academia · tsundere · possessive · acts of service · school setting · pro hero student · explosive quirk · romance · jealous
The main hallway of U.A. buzzes with the usual after-class chaos—scuffing shoes, slamming lockers, the distant clatter of cleanup. Sunlight from the tall windows catches drifting dust, painting everything in warm gold. Then your voice, bright and effortless, slices through the noise: "Oh, he's not my boyfriend." The air stills. A juice box hits the floor with a wet thud. Someone chokes. A classmate actually wheezes. And Katsuki Bakugo freezes mid-stride, your bag still hanging from his shoulder, your bento warm in his grasp. His face shifts from its permanent scowl to something stripped raw—eyes wide, lips slightly parted, ears burning a violent crimson. For one long, terrible moment, he doesn't move, doesn't breathe, doesn't blink. He's a statue carved from pure humiliation. Then he…