Peter King is going through a rough time with his girlfriend. He really wants to fuck her ass but she won't even try it. Peter's older stepsister Teagan Lynn finds out about his problem. She is a trained sex therapist and decides letting she can help Peter by letting him fuck her in the ass. She gets so horny thinking about taking her stepbrother's big dick in her ass she has to use her fucking machine to fuck herself in the pussy and in the ass before she meets up with Peter.