The Magical House of Dumbledore (A Marauders...
Harley Davidson is a Muggle-born girl, and doesn't like it when people make jokes about her name. When she finds out she is a witch, she is accepted into Hogwarts.... IN HER FOURTH YEAR?
She would have been a fifth year, but it would have been too harsh on her to learn five years worth of things, and not to mention all the homework.
When she gets sorted, she is placed into an unconfirmed house. The Headmasters. She is only placed there as she seems unplaceable by the Hat.
She is constantly being flirted with by Sirius Black, but prefers Remus because of their books choice. Both she finds infuriating. Peter she doesn't so much as like because he is a suck up, and James hilarious by the constant rejections of her best, childhood friend, Lily Evans.