Mattheo is a new student in the 3rd year of hogwarts. You are y/n black, sirius blacks daughter, nobody messes with you, your actually liked by everyone and friends with them all. When mattheo comes in, his eyes lay on you in the train. In the carrage your sitting next to draco, pansy is infront of you, and blaise is next to her, theres an empty seat next to you so mattheo asks to sit with you guys, you both become best friends but with benifits.