Y/N and Theodore Nott have always despised each other. From the moment they met at Hogwarts, their interactions were nothing but sharp remarks, cold stares, and constant competition. Theodore finds Y/N loud and insufferable, while Y/N sees him as arrogant, secretive, and impossible to read. They avoid each other when they can—but somehow always end up clashing. Everything changes when they’re forced to work together on a long-term assignment. At first, it’s a disaster—arguments over every decision, tension thick enough to cut. But slowly, things begin to shift. Y/N starts to notice that Theodore isn’t just cold—he’s guarded. And Theodore begins to realize that Y/N isn’t as reckless as he thought—just passionate and fiercely loyal. Late nights studying turn into quiet conversations. Insults turn into teasing. And somewhere between their arguments and stolen glances, the hatred starts to blur into something else. Neither of them wants to admit it. But when one of them gets hurt—emotionally or physically—the other is the first to show up, no hesitation. That’s when it becomes impossible to ignore: what started as rivalry has turned into something deeper, something real. And maybe, just maybe, the person they hated the most… is the one they needed all along.