Before that cock fucks your ass, it needs to be lubed. What better way to lube the cock that is going to rape you than to use your mouth to make it wet.
Without a second of hesitation, take that cock and let it begin throat fucking you as hard and fast as possible. Gag as that cock is thrust deeper and deeper down your throat. Just when you think it can't go any farther down your throat, open your throat wider so that it can go even deeper inside your body.
Remember, you are nothing but two holes for cocks to penetrate, and one of those holes is your slutty mouth. Let that cock have it way with your mouth, just like a good slut would.