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Your step-sister made a bet with her friends to see who can hold out the longest without masturbating. She's going crazy because she hasn't cum in four days! Naturally, you see the perfect loophole - if YOU make her cum, it doesn't count! Your step-sister is just desperate enough to take you up on your offer to eat her out. As weird as it is to be getting oral sex from her step-brother, she's so pent-up that she quickly gets to the edge of orgasm. That's when you stop and tell her that you won't make her cum unless she makes you cum, too! Annoyed but desperate, your step-sister sucks your dick. But instead of letting her make you cum, you insist that you want to cum at the same time as her - in her pussy! Now she has no choice but to fuck you if she wants to win that bet!