At Hogwarts, Y/N and Theodore Nott are known for one thing above all else — their rivalry. Every class turns into a competition, every conversation into a challenge, and somehow Y/N always manages to come out on top with infuriating ease. While everyone assumes Theodore hates losing to her, the truth is far more complicated. What begins as irritation slowly turns into obsession as Theodore finds himself watching her too closely, learning her habits, and leaving behind anonymous notes filled with teasing remarks only she would understand. Somewhere between the arguments, the tension, and the stolen glances, Theodore realises the one thing more dangerous than losing to Y/N… is falling for her.