It’s his eighteenth birthday.  He is four years younger than you and already more of a man that you will ever be.  He has been bullying you since he was fifteen. As a special birthday present to himself he is going to bend you over and fuck you in the ass.  He is waiting for the rest of his friends to show up before making you drop your pants and become his bitch.  He wants to maximize his domination of you, a bigger and older guy, that should be in charge, by raping you in front of witnesses. Showing everyone, that he is now a man and as a man he takes what he wants and deserves to be respected and feared by those who are less worthy. He will then offer you to his friends to use.  Because although he is powerful and obviously in charge, he is also generous and shares his toys.