They’ve hated each other since second year. Mattheo Riddle and Y/N have spent over a decade perfecting the art of ruining each other’s days—sharp words, sharper looks, and a friendship group that’s long stopped asking why they can’t be in the same room without starting a fight. So when one drunken night turns into something neither of them talks about, nothing is supposed to change. Except it does. Now it’s arguments that last too long, silence that feels worse, and a secret that keeps happening no matter how many times they swear it won’t. They still hate each other. That’s the problem.