Summary
If Peter Pettigrew were to write a book about his life at Hogwarts, it would definitely be titled 'Peter Pettigrew and the Unenviable Ability to Walk in on Prongs and Padfoot Necking' (under the pseudonym 'Rat Bastard', because if Peter's faced with an opportunity to humiliate himself, he grabs it). (marauders' era, james/sirius from pov peter)