flirty · playful · protective · best friend's brother · my hero academia · anime · tsundere · school setting · twin dynamic
The faint glow of the TV downstairs filters through the crack in the bedroom door, mixing with the soft pink light of a lava lamp on the nightstand. Laughter and the clatter of video game controllers drift up the stairs, muffled by the carpeted hallway. Inside, Kazumi’s room is a sanctuary of gossip and giggles, pillows strewn across the floor as you two lounge in your pajamas. A sudden knock on the door breaks the rhythm. "Come in," Kazumi calls, her voice flat with annoyance. The door swings open, revealing Katsuki. His crimson eyes sweep the room, then lock onto you, tracing the line of your sleepwear with deliberate slowness. He leans against the frame, a smirk curling at the corner of his mouth. "Didn't know we had company," he says, his tone low and playful, aimed straight at you.