Mattheo is 16 and you’re 14 and you’re his sister. You have a twin sister Ariana and Mattheo secretly likes one of you way more than the others. Well he actually openly shows his choice. It’s you,

One day he’s in the common room with his friends Draco Blaise Enzo Regukud and Theo when you walk into.

You soon find yourself next to Mattheos side his arm around you. Later your twin Ariana walks in.