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Your Step-Parents have gone out shopping and you're home alone with your step-Sister. You guys have never really seen eye to eye, but she comes and joins you on the sofa teasing you about your new Girlfriend. You notice she isn't wearing any panties when her dress accidentally rides up, so you tease her right back asking to see her pussy again. Surprisingly she shows you and spreads her legs for you!! You feel yourself getting a boner which she sees and points out, teasing you because you clearly find your own step-sister attractive. You've seen her bits..so she demands you show her yours. You get your hard cock out for her and she giggles and asks to touch it, she then asks if you can teach her how to give a blowjob. Things were never meant to escalate, your parents could be home any minute but with her pretty little mouth wrapped around your cock you cant help but to stick it in her. Your step-sis begs you not to cum inside of her as she isn't on any contraception, but it feels too good to pull out. "WTF have you done step-Bro!?"