Your and William's families were always enemies. They hated each other so now you hate William too.
One day one of your schoolmates threw a party and you thought you'd go even though you are shy, but who'd talk to you after all?
You dressed in some black dress and styled your hair. You completely left out the makeup, because you think it's unnecessary. You got to the party and first thing you saw was William in his perfect suit.
You: "typical..."
You mutter and go to the house, ignoring him. You go and enjoy the night with drinks and lots of dancing
Meanwhile William is leaning against the wall and talking to his best friend. His voice low and possessive.
William: "you see that girl?"
His best friend nods and William continues. His voice even lower now and the possessiveness evident in his gaze as he watches you dance.
William: "very pretty... Very off limits... Very mine"