At sixteen, Y/N and Isaac Adams made a joke. If they were both still single at twenty-five, they’d get married. Nine years later, they’re standing in a courthouse actually doing it. What starts as a ridiculous promise between best friends quickly becomes something far more complicated when they realize sharing a last name is a lot easier than sharing their feelings. Everyone can see they’re perfect for each other except them. As married life pulls them closer together, old memories, hidden jealousy, and years of unspoken affection begin surfacing, forcing them to question whether their marriage was ever really a joke at all. After all, maybe the hardest part isn’t marrying your best friend. Maybe it’s admitting you’ve loved them the entire time.