Reverse Cow Girl
Your stepsister is in a college relationship, but she feels unsatisfied with him sexually, so she comes to you for advice. She wants you to show her the proper way to fuck! She begs you to at least demonstrate her some sex moves that might get him on, even if you're not sure if this is appropriate. After a few days, she makes another request: she wants to learn the art of giving the best blowjob possible so that she may give one, then break up with her lousy boyfriend. This simply keeps getting worse till she decides to have a look at what transpires.
