Y/N is the long lost sister of Harry Potter that him and none of the Weasleys and anyone know about except for the original people that were around his parents. She went missing the day before everything happened with a little more and Harry's parents dying. she's in New York. And Sirius and remus make it there most important thing to find her.
No one knows that Stiles Stilinski and Y/N used to hook up before Malia, but honestly it's more than that. Not even the pack knows. Only Scott. Because he is Stiles's best friend. But what happens when she goes for a run through the wood like usual, and the pack is there hunting something. Stiles yells at her to go home because she can't be there while standing with Malia and she is obviously annoyed and walks away. But Scott knows she isn't just some random girl. And Derek isn't stupid. When everyone goes back to Derek's Warehouse loft after a while everyone leaves except Scott, Stiles and Derek. Stiles is trying to call her but she isn't answering him.
Y/N has always been there. She has had a crush on Stiles stilinski since freshman year. Of course he never really noticed her because no one does it's not that she's ugly she's actually very very pretty she's just very quiet and she will not talk to you unless you talk to her. This is right after Stiles stopped being possessed by the void. He's still feeling kind of weird and things like that but one thing he noticed that you know when he was the void the one person that really noticed that he was not himself before anyone else was Y/N. So after he was back to himself he started paying attention to her. He doesn't really say anything at first but he definitely starts paying more attention to her.
Y/N is Stiles Stilinski's older cousin on his mom's side it's his mom's sister's daughter. She hasn't been in town since he was a freshman so she doesn't know about any of this werewolf stuff and they talk but obviously he doesn't tell her about it. What happens when she decides to come and visit him and his dad Noah Stilinski the sheriff without telling them. What happens when she sees Derek Hale.
Stiles Stilinski and Y/N are friends. No one knows they are friends. Not even the pack. Not even really Scott. He comes over when no one is around. Comes to her house when no one is home. They touch. Like holding hands. Cuddling. But not anything else. Not anything real. Until one night he comes into her window. Throughout their friendship he's told he everything. This is after the void. And he is angry and upset and doesn't know how to let go of his emotions. So he goes to her house because she always makes him feel better. This time he needs more than just cuddles or a hug though.