The Strays.

Lydia Marin is a young bastard Liba who decides to create a safe haven for bastards. She meets many friends doing this and makes herself a family. She finds holes in almost everyone's stories though.
She goes to school at Hogwarts and is picked for the Slytherin house where she meets a friend that will ALWAYS be there for her.
She ends up changing her hair and does intense makeup to hide her identity to sneak into her castle and ends up becoming her older brothers servant. She meets Loki there and he can see through her poor disguise and he teaches her how to better hide herself and teaches her how to be a trickster.
Eventually they grow up and younger generations of bastards still use this place and the original strays move on to other places and make a name for themselves.
Lydia ends up getting thrown in a torture house and meets a man who becomes her absolute best friend and they are ALWAYS with each other until something pulls them apart.
Lydia ends up in Mystic Falls and finds him again. She ends up being the smartest most terrifying woman he has ever met... but will he pick her or will her world fall apart around her? Will she have to pick up those pieces on her own or will she gain true friends that will always be there for her... friends unlike anyone she has ever met?