Sirius Black's twin sister Sevyn, a tough and stubborn fighter who was damaged by her parents abuse, and Remus Lupin, broken by a cursed fate, share their relationship behind closed doors and the eyes of the Marauders.
Amaya and Sirius had always been close, until they started Hogwarts. They were sorted into separate houses and they sorta developed feelings for each other.
Sorry, I suck at descriptions. My sisters said it was good after I forced them to read it.
Disclaimer
I do not own any of the Harry Potter characters. They all belong to J.K. Rowling