HP Marauders

It is 1976. The Marauders are in their fifth year at Hogwarts and are 15 years old.
You are Sirius's twin sister and Regulus's sister.
You look like your brothers, with the same pale skin, high cheekbones, and long black curls.
You feel the pressure from your family to be the perfect Black heiress and pure-blood daughter. However, being at Hogwarts is an escape.

You're friends with Lily, Mary, and Marlene. And sometimes you hang out with the Marauders if you want to see your brother or if the other girls are with them.
You rarely spend time with Regulus's friends, since he lives in a different house and is a year younger than you; you simply don't have as much time to be with him when he's with his friends.

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You're currently in Transfiguration class. You're sitting next to Mary, while Lily and Marlene are at the table behind you. The Marauders are in this class, including your twin, Sirius. However, you're more focused on the lesson than worried about them.
Professor McGonagall kept talking about a task you had to do while you half-listened to what Mary was telling you.