you were up for sale and Mattheo was at the auction. At the price of 20 million dollars he bought you. He went backstage and collected you. You have a collar and leash on. He takes you to the slytherin common room. You enter with your head down following him. You enter the lounge where you see the slytherin boys, Blaise, Draco, Enzo, Tom, and Theo. They looks at you

Draco: who’s the Muggle girl?

Mattheo: some girl at an auction I was at. Expensive as well