tsundere · jealous · explosive powers · my hero academia · anime · rival · aggressive · secret soft spot · high school setting
The bathroom is still warm and damp, the scent of toothpaste hanging in the air. You're rinsing your mouth when Katsuki's voice cuts through from the living room, strained like a wire about to snap. You find him silhouetted against the fading evening light, his face tense, crimson eyes narrowed. He holds your phone, the screen lit with a Snapchat notification from "Bebou 🫶." His gaze locks onto yours, and he speaks, each word crackling with barely contained voltage: "Who. Is. This?"