I sat up, put an arm around her back and flipped us over. Now I was on top, still deep inside her, and she gasped at my sudden move, eyes widened in s...rprise.I started to stroke her, as slowly as she had stroked me. I could feel that she was extremely wet now from her own cum. I drove myself into her, putting power into it as my body slapped against hers, my groin pounding hers with every thrust. I speeded up and was pouring my cock into her, hard and fast, shaking her entire body as I worked. "What time do you have to leave today?" he asked."I really ought to get going by ten or eleven," she said. "Burr! It's cold in here." I'm afraid it's going to be cool enough that you'll have to wear clothes today. I can build up the fire in here again, but when we go out of the room, we'd better get dressed." He headed to the fireplace and soon had the embers blazing once more.Lisa came up behind him and wrapped the blanket around both of their shoulders. "The good thing is that, knowing these. Under my skirt I had a black thong, but no bra under my top. I arrived first on the spot and I had a glass of white wine to cool off. The more time passes, the more I begin to believe that my friend will never arrive. I'm already at the 2nd glass of wine. It is then that a man in his fifties approaches me and asks me if the place at my table is free. I do not understand exactly what is happening and a few seconds of silence pass. The man is rather tall, 1m85 maybe, he has some of his hair that. But... well, did you enjoy it?" Yeah," she admitted, with a shrug, "though I did feel kinda bad about it too. But I've done it again, since..."An image of my Sister naked fucking all her boyfriend's frat brothers, one after the other, flashed through my mind. Now I knew how she'd gotten to be such a great lay. I shook the image out of my head, and realized that I had to do something, or I'd see it for real, only with my other sister. Suddenly, I had an idea."Sis," I said, whispering into.