It's your wedding day and you decide to go check on your sister who is getting ready. You find her trying on a very slutty red lingerie set with an almost invisible g-string thong. You get jealous and demands she changes to something modest. Then your sister starts teasing you and reminding you that you no longer fuck and starts comparing her tight ass to your wife. The teasing escalates quickly to your sister calling your soon-to-be wife ugly and boring and threatening to go out and tell everyone you two have been fucking and get your wedding cancelled. You get mad and lock the door until she stops black mailing and apologizes. Your sister needs to pee really badly and begs you to open the door but she can't hold it and ends up emptying her bladder and making her sexy panties soaked. She takes them off and informs you that you will take responsibility for this mess by paying her with your hard cock. She strips, teases you with her pissy pussy and rides you. Your hard cock makes her feel so good that she pees a second time. After she is satisfied she decides to keep your secret as long as she can use your cock any time she wants.