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It was definitely not a smart move to leave your computer like that, right where your step-mother could find it. You didn't even think twice about it, until you got home to see her waiting to confront you. She had seen the 'step-mommy porn' on your computer, and wanted to discourage it as quickly as she could, pointing out how inappropriate it is. But you can tell she's interested, especially since she can see how hard you are through your pants. She offers a deal: she'll help you jerk off to her tits, just this once. Remember to thank your step-mommy...