We had a very light lunch and after it I picked up the table and my wife went to the bedroom to get ready for Nancy . I heard her calling me and when ... got in the bedroom my wife had prepared all the paraphernalia to strap me to the bed, blindfold me and gag me. Oh, I said, you did not tell me that this was going to happen. And the role of mistress came out to my wife. And she said that I must have forgotten that she said some time ago that she would bring me the girl of her lesbian experience. She was also by far the prettiest girl in the entire school. Mother Nature had been very kind to her. That year between twelve and thirteen had turned my sister into a beauty queen. Her face was exceptional, her breasts were big and bountiful, her hips flared, her tummy was flat, and her legs went on forever. Then of course there was her fabulous butt. It was perfectly rounded in every way. To top it off she had naturally curly blonde hair, blue eyes, and a great tan.That first day as we walked. Next she picked out her bra and panties, checking with me that the colour would match her dress or would they be visible through the dress. then she pulled the purple pouch from the drawer and left.A few minutes later, she was back in her room, she called me “JJ, can you come in here please”. I climbed out of bed and went in to her room. She was sitting on her bed, wearing only her bra and panties, her bra straining to keep her large breasts from falling free, the matching panties covering very. .deeper! Yes……..yes…..I…….I…..I’m cumming……I'm cummingggggggggggggggggg!” she screams. Itch scratched to satisfaction, Lisa slowly drifted back down to earth as the long strokes continue to pump in and out of her pulsating pussy. Then Lisa realized just what could result from this horrid mating with me. She squirms desperately, trying to push me away, pleading “ Please………please, John…….pull it out……pull it out! Please………please, you're not wearing a condom…….you’ll get me pregnant!” she.