Y/N and Mattheo Riddle have always had one thing in common: neither of them knows when to shut up. Their constant bickering is practically legendary at Hogwarts. Insults, arguments, and sarcastic remarks are normal between them—but there’s always been an unspoken line. No matter how angry they get, they never use each other’s deepest insecurities against one another. Until one argument goes too far. Mattheo says something he can never take back. And for the first time, Y/N doesn’t argue back. She just walks away. Now Mattheo has to face the one thing he’s never been good at: admitting when he’s wrong—and figuring out how to fix something that might already be broken.