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Your step-sister notices you looking at her a little too much while she's studying, she pulls the blanket off you and reveals your hard dick. She's disgusted! You explain you can't help it and you'd love to get her an A on that exam if she cooperates and makes you cum. Reluctantly she accepts the offer, at first acting completely grossed out, but soon she notices how excited you are and gets into it. She gives you a handjob while stripping down to her bra and panty showing off her big round ass and pretty face while encouraging you to cum for her and making fun of you for being a big pervert.