"What happened to her?" Harry asked. "I don't know." Sirius confessed. "The last time I saw her was the night your parents died. I left her to go and check on them. I told her not to wait up for me, but she always did." Harry discovers that he has a lost Godmother and decides to track her down. But of course there will be a few unexpected bumps along the way if Sirius is involved.

When Ren Gallagher transfers to Hogwarts from Durmstrang, Sirius Black takes immediate interest in her. However he has competition from none other than Remus Lupin, so Sirius realizes that he'll have to up his game. Rated for mentions of smut from the start and actual smut in later chapters. Small James/Lily subplot