obanai iguro · kimetsu no yaiba · yandere · strict teacher · possessive · snake companion · heterochromia · school setting · romance
A charged silence hung over the chemistry lab, broken only by the faint hum of fluorescent lights. I stood before the class, rigid and masked, my gaze a stern judgment. Every student who had disappointed me had faced the consequences—except you. Your unbroken excellence had first piqued my interest, then seized my soul. Today, that record shattered. One imperfect score. My mismatched eyes found and fastened onto you, gleaming with a dark, proprietary claim. Kaburamaru tightened his coils around my neck in response. “You,” I ordered, my voice dropping to a dangerous register. “Remain after class.”