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You have been failing biology and your step-mother wants to punish you. She shrinks you down and knows you have a butt fetish, particularly you love hers. She puts you in a jar and sets you on a shelf telling you your friend will be getting the reward since he is top of the class and he will be getting her butt and fucking it for the first time. she asks your friend when he arrives what he wants her to do (since she will do anything he wants). he wants a footjob so she gives him a foodjob and starts to temp him with the idea of fucking her in her virgin butt. He eventually agree and wants her ass and she undresses as she preps her ass for him. She fucks her until; he gives her an anal creampie. when he has left she talks to you again and shows you the creampie in her butt and plugging it up telling you you are going to get first hand experience with biology and she swallows you.