You're one of the prefects of Hogwarts and a lot of people have a crush on you or find you attractive. All except Percy. Percy likes Penelope Clearwater (A Ravenclaw Prefect) and would do anything for her so they're both dating.

You were envious of her. You liked Percy and couldn't do anything but stand by the sidelines. So you decide to be that one girl that every girl who hate, the third person.

One day, you arrived late to Professor McGonagall's class before you were busy talking with Oliver about the Gryfinddor Quidditch practice that's coming soon and without looking, you say beside Percy which made Penelope sit behind.