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I was walking up the stairs when my stepsister came out of nowhere and started talking to me. I couldn't help but stare at her amazing body, especially her big ass. She noticed my gaze and decided to show me what she had to offer. First, she took off her shorts and then her top, revealing her natural tits and her big pussy. I couldn't believe my luck. I had always been attracted to her, but I never thought I would get to see her naked. She got on her knees in front of me and started sucking my dick. It was the hottest thing I had ever seen. After a while, she let me fuck her in the ass. It was a sight to behold as she moaned in pleasure. I couldn't hold back any longer and I came all over her big ass. It was the best sex I had ever had and I knew I would want to do it again.