Sirius Black and Remus Lupin are two Hogwarts students in their second-to-last year, deeply in love and partners for the past two years. They’ve been discussing the idea of opening their relationship and making it polyamorous. One day, during a routine Potions class, a new girl walks in, catching both their attention. With their curiosity piqued, Sirius and Remus see this as an opportunity to explore new dynamics and connections.