I had thought of two ways of helping making that possible. The first was based on the fact that I can swim. Until a year or so ago, my complete lack o... athletic prowess made that statement rather surprising. However it happened, swimming was one of the very few physical activities I could do reasonably well. It occurred to me that my being able to swim at all, plus NP-assistance, could make me an EXTREMELY good swimmer.It seemed to me that the physics of swimming the freestyle stroke boiled. An understanding between us that it goes no further, though I admit I have fantasised about the three of us together many times before now. I made the decision not to do anything sexual anymore, since I didn’t want to blur the boundaries to what was or should be acceptable. A little nudity seemed fun and everyone seemed to be okay with that. I decided to get into bed and watch some tv, when my hubby sent me a text, asking what I was doing. I told him I was wearing his old Pantera tshirt and was. ” That was all Dave needed to hear. His cock was hard and ready for Christens’ tight wet pussy. In one big thrust of his hips he entered her. Her pussy lips unfolded and welcomed him in. Her pussy was just as good as he had remembered, if not better. Grinding her hips to meet his every thrust, their fucking became a game of pleasure, and playing it seems to bring them endless joy. Neither Christen nor Dave was aware that they were being watched. As brother and sister continue to make love, a. Greg was too dazed to say anything as he left with his sister. Sis and I were still naked and she knelt down to taste the combined juices which made me start to fill again. I heard, “I wonder of taking it in the ass is incest? I’m still horny. Greg has a lot of potential and Linda said you were good. She’s only had a few one-time fucks, never a steady boyfriend like I have. I think you might be one for her.”That’s what it seemed like every day after school and also over at Greg and Linda’s when.