TL

Remus Lupin never expected to fall for someone through a library book. It begins with a sarcastic note scribbled onto an old checkout card. One reply becomes another, until anonymous book recommendations turn into teasing, secrets, and confessions neither Remus nor {Y/N} can say aloud. Neither knows who they’re writing to. The problem? They already know each other in real life—and Remus is slowly falling for the same girl twice.