Every since Sierra returned from her first year at college, her stepbrother has been in a heightened state of sexual frustration. He knows he shouldn't have sexual thoughts about his little step-sister but he cant help himself. He passed her opened door on the way to the restroom one day to catch her legs wide open on her bed and her fingers under her panties. He had fantasized about this very image many times and has jerked off to this fantasy quite a few more times than he will admit. Now that she is aware of his interest in her, she rubs her pussy again, right in front of him. She also asks to see her stepbrothers cock. She explains its not wrong since she is really only his step-sister. He protests he isn't going to show her his dick. He is so concerned about their parents finding out. She doesn't care. She wonders if he has a small penis and if that's why he wont whip it out for her.