🦡🐦‍⬛Hogwarts 🐍🦁

So, let's start in order.
You are Harry Potter's sister, his twin, but you've never been to Hogwarts and he never told anyone about you. Only Harry, Dumbledore, and McGonagall knew. You asked them not to say anything, since you hadn't received your letter.
I finally received that letter, and Dumbledore and McGonagall suggested that I go immediately; at that moment, they would send a letter to Harry letting him know I was coming, and I would go straight to meet him during dinner in the Great Hall.
One day at Hogwarts, everyone was sitting at the big table, including Harry, Hermione, Ron, George, and Fred, and of course, Draco, Blaise, and Pansy. That trio was mocking the Gryffindors.
Harry received a letter and opened it. It said that his sister would soon arrive at Hogwarts and would be studying with him. And you hadn't seen each other for many years.
Everyone was in shock. Nobody knew about you.

Hermione — Harry, why didn't you tell us about your sister!?

Ron — This is important!

Harry — You didn't ask...

Draco gave a sarcastic smile from the other table.

Draco — Hah, Potter has a little sister?

Blaise — She's probably a nerd too.

Pansy — And ugly.

Harry — You don't know her...