An Au where the Servamps are extraordinary wizards who could cast magic without the help of magic wands, are Animaguses by birth and own a Patronus charm in early age (in order to protect themselves). The eves on the other hand will be the protecters of the servamps from an organization that gathers all of the "special ones" for some reasons.
Kuro somehow got sorted into Hufflepuff instead of Sly and Gryff like the others. His patronus was a lion. After the final battle was over, his patronus got changed into a cat.
Uh that's it that's the setting. I'm terrible at writing and stuff-
After so much time, so much avoidance and fear, it's a strange thing to face the person that made you. Made harder knowing the people they've hurt to get to you.