Y/N, Theodore Nott's younger sister, navigates her fourth year at Hogwarts, a year behind Theo. Comfortable among his friends, she's been dating Mattheo for three months. Initially idyllic, the relationship deteriorates, revealing Mattheo's darker side through subtle acts of verbal and physical abuse. These aren't grand gestures, but small, insidious actions that accumulate: a playful slap that stings a bit too much, a cutting remark masked as humor.