A Marissa Sweet roleplay. Your step-sis askes for your help opening a bottle of water, you tell her you'll open it for her if she shows you her butt. She agrees and shows you her butt in the least sexual way possible, you tell her you expected more and she says that if you help her she'll be really nice to you later. She comes back in a pink micro thong to tease you with her ass and encourage you to jerk off and cum all over her asshole.