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You stop by to see your girlfriend (my step-sister). You are surprised to find me there by myself. We end up finding out that my step-sister got her times mixed up and is out at the salon so she wont be home for awhile. I tell you it's no problem for you to stay and wait for her. We start chatting which quickly turns to flirting. Next thing you know I am propositioning you to have some fun with me! You fuck my brains out and cum inside of me so we don't leave a mess! Better to be as careful as we can so my step-sister doesn't find out!