Discovering Peter's the Spy Early
I'm looking for a story where James, Remus, and Sirius discover Peter is the spy and capture him before all the horribleness happens. I think it was fairly long. I think they used veritserum in James' kitchen to discover the truth. In one scene, Remus and Sirius are in a room at the Leaky Cauldron and they share a bed and things happen. I think I might be smooshing more than one story together. I'm really in the mood to read something like this though so would happily take anything you've got.