Y/n is Theodore Notts beautiful, fun younger sister. She's been homeschooled at their manor in Italy her whole life so no one knew her. She's now joining hogwarts and will meet all of Theo's friends, except to everyones suprise she already knows Mattheo. Y/n and Mattheo met during summer in Italy and soent some time together/hooked up. Mattheo started falling for her but when summer ended life went back to normal and they lost contact. Mattheo didn't know she was his best friends sister and she didn't know he was her brothers best friend.