After breaking up with you girlfriend, you walk into your house and hear moaning and vibrating sounds. You walk up to your sister's room and see her masturbating. You know you should turn away, but you can't. It doesn't take long for her to realize that you are there. She yells at you, asking you if you were spying on here. She also asks why you are even home since you were supposed to be with your girlfriend all weekend. You tell her about your breakup and she immediately gets less angry. She asks if you are okay and then she tells you that she knows something you two can do to help out both of you. It will help you forget about your breakup and it will help her finish what you started. This will be the only time you two do it, she promises. Hearing her say that turns you on. You were already turned on from watching her, but you never expected your sister to suggest that you two have sex. Your sister then begins to tease you with her tits, asking you how many times you've spied on her before. She then admits how hot she thinks you are, and that she never liked your ex girlfriend anyway. She knows you better than any other woman ever could, because of your shared dna. She knows exactly what you want and how to do it. Your sister then tells you to come to her so she can suck your dick. After she sucks your big, thick cock she then lays down on the bed so that you can fuck her. You never thought that fucking your sister would feel this good. She then takes out her vibrator, the one she was using when you first spied on her, to cum. You can feel her tight pussy clenching around your cock as she does. She then gets on top and rides you, her small perky tits bouncing in your face and tells you to cum inside of her and fill her with your shared dna. Once you cum, you know that you two will be doing this again and again and again.