Your step-sister's girlfriend tells you she's going to propose to your step-sister and she needs your help! No, not with the proposal... she wants you to fuck her so she can experience cock one last time. You're taken aback (she's your future step-sister in law!) but she keeps pressing you, teasing you and talking about how your step-sister's strap on just doesn't cut it. God she's hot, she never wears a bra and you can see her hard nipples through her flimsy top. Finally, you give in. She rides you while she talks about how she wishes she was eating your step-sister's pussy while you were fucking her and tells you to think about how dirty it is that you're fucking your step-sister's fiance. She asks you to cum deep inside her pussy and tells you she's not on birth control (why would she be? she only fucks your step-sister) because the riskiness gets her off. You can't believe she's cheating on her girlfriend with her girlfriend's step-brother of all people. You're a lucky guy! Tags: infidelity, cheaters, family affair, step-sister in law, lesbian, bisexual, cock hungry, dyke, thong, brunette, nose piercings, convincing, impregnation fantasy, roleplay, POV, persuasive, taboo, landing strip