A Brutal Slasher Story - Please Add On To This

You lie on the bed and he loops a rope around your body. You have to pee SUPER bad. He is finished tying you to the bed. You tell him to cut you loose and he walks away like a little bastard! He closes the cabin door and you squirm in discomfort. You scream, "Goddamn you son of a B#tch!" You still have to pee. What do you do?