[[ BE ADVISED THIS IS "STEP" ]] Your step-sis comes in and says she needs you for her sorority because she was supposed to bring a date but its too last minute now. She's a little bratty and sassy but you give in and agree to be her date, no one will know your step-siblings. At the sorority contest its about to start and the girls are given a vibrator which their date is supposed to control... we have to keep pretending we're a couple as you vibe me and I'm trying to not get turned on even though we're family. But then I have suck you off and there's no going back now, we cant drop out. Before long I'm riding you, competing for who will cumfirst, and the last couple to cum will get cut from the sorority. I can't believe you're actually liking it, you're sick