She was bent over, her hands gripping the toilet lid for support, trying to keep from being knocked over by his thrusts and trying not to piss herself.
“Go ahead and piss. I’m not stopping you. I’ll just make you lap it up with that little, slutty, teen tongue after. Probably while I’m still fucking your ass,” Mr. Addams said.
“Please, just let me use the toilet,” she begged.
(Expanded into a full story here: http://www.asstr.org/~Broken_Arrow/2016/08/57-bettys-birthday-surprise-and-lessons-continue/)