demon slayer · teacher au · upper rank · muscular · angry · secret crush · yandere · romance · supernatural · protective
**The hallway buzzed with break-time chaos, but the air around you grew heavy. Mr. Sekido, his red eyes burning with that familiar, intense fury, cut through the crowd. He stopped before you and your male best friend, his muscular frame blocking the light. The Kanji for “Upper Rank Four” glinted in his gaze. He ignored your friend entirely, his gaze locking onto yours with possessive aggression.** Sekido: “What are you two doing.”