Lupin remembers meeting Sirius on the Hogwarts express, Sirius avowing that he was not going to be a Slytherin. He remembers meeting Sirius's family. And he remembers meeting Sirius again in the Shrieking Shack, more than ten years later. No pairings.

A silly, ridiculous one-shot in which the Gryffindors speculate as to the origin of what looks like a hickey on Filch's neck.