I've Given You Viagra

Brook is giving you some new medication but there is a problem, she has mixed your pills up with someone else's and now you have an erection. She has accidentally given you viagra! She begs you not to tell anybody about her mistake and tells you that she is willing to do anything to keep you quiet, you decide to make her help you get rid of your erection by letting you wank over her ass while she is bent over with no panties on.