What happens when Sirius and Ailee Black's two daughters and godson, Harry Potter, go off to Hogwarts? (Sequel to Mystery Girl)

A collection of Sirius Black x reader oneshots, all written by me.

"You're the goodest bad girl I've ever met."

When Ailee Abbott runs into Sirius and James on the train at the beginning of her 5th year, she learns some interesting new information. Sirius Black, The Sirius Black, has been pining after a mystery girl since first year. What happens when they start to become friends? Will she find out who this mystery girl is once and for all? [Sirius Black x OC] [Marauders Era] [COMPLETED]