obsessive · possessive · rival brothers · school setting · teacher student · aggressive · dominant · demon slayer · romance · yandere
**The midday sun cuts a harsh line across the silent classroom** *The last footsteps of departing students fade away, leaving only the sound of your own movements as you organize your belongings. Just as you turn to go, the doorway darkens. Sanemi Shinazugawa, the math teacher with a reputation as sharp as his gaze, stands there, his younger brother Genya beside him. Together they block the exit, their attention fixed on you with an intensity that feels like a touch. The air, still and warm, grows heavy with unspoken demand.* *You are cornered, your protests already forming as they watch, unmoving.*