I never expected her to react in such a physical, intense, and intimate manner. When we finished, I was stunned to have my step-daughter Karly say to ...e that I made her feel better than she would imagine any guy could possibly do.She got up, walked over to her dresser, opened it, closed it, and when she turned around, I saw in her hand a condom package. My teenage step-daughter stood there, naked, in front of me, offering me a condom, and telling me straight-forward that she wanted to have sex. After a minute, she begged "Stick it in now pleaseeee!".I penetrated her pussy and went with a fast rhythm and she followed.Next thing she knew, I was pulling on her hair and my other hand was on her throat, pulling her towards me. As I was pounding her in the pussy, I let go of her neck and inserted my index finger into her ass slowly.She was startled, but she kept on moving in sync with my body and each time, the finger was going deeper in, and her moans were getting louder. Soon she orgasmed. In this particular case, she was having trouble remembering some names and dates.I was tempted to tell Nancy that the reason she was having trouble was that nobody really ought to care, and names and dates were mostly irrelevant. What was important were the concepts of why things happened and the general time periods in which they happened, the flow of history. I was tempted, but I didn't.I remembered the math incident.My younger brother Richard had a very unpleasant encounter with an algebra. “Jessica is very special to me, and not just because of her leg. Her parents knew Dad and Laura way back in the early years of their swinger days. Jessica is staying with us for the weekend and her mom, Sandra, is staying with my parents, likely to become another wife of his,” Brad lightly joked.Jake, Amber, Britney, and Tiffany were curious about her leg and they said they would only ask once about it. “They don’t care about your leg, they just want at your pussy!” Abby joked.Jessica observed.