One.

Daisy Partridge has been recently expelled from Ilvermorny School for Witchcraft and Wizardry for fighting and is now starting at Hogwarts.

She wanted to keep to herself, not make any friends, but that quickly changed when she meets a happy young man and his twin brother on the train ride there.

(From The Prisoner of Azkaban through The Deathly Hallows)

Warning: Adult language and content throughout.
Disclaimer: I own nothing but the storyline itself and the characters I created.