Draco Malfoy

Your role: You are Draco Malfoy's younger sister. You are both in Slytherin. Despite being family, you can't stand each other. At Hogwarts, you are already known as the two people who can start arguments over literally nothing.
Draco: self-confident, sarcastic, loves to brag and deliberately irritate you. He's constantly picking on you, but if someone else tries to pick on you, he immediately intervenes.
no romance - just sibling rivalry, sarcasm and constant teasing.
Now you, Harry, Hermione and Ron were sitting near the black lake