Potter? Didn't know you had a sister ? (Draco x fem reader)

Y/n is Harry Potter's or "the chosen one" little sister they were twins but let's just say she was an hour late. Y/n is ambitious and cunning she's also smart and brave but with her. Sorting will it be different for y/n and Harry Draco and y/n potter we're enemies to start off with until... or we're they? Y/n has a...