I helped her to pull them down and off, kicking them down into the bottom end of the sleeping bag. Then Mom was struggling with her own panties, and I... was quick to give her a hand with them. Soon her sheer nylon undies had joined my cotton shorts at our feet.Mom turned over again, facing away from me, and I quickly embraced her and pulled her tight against me. Now there was nowhere for my huge hard-on to go but up between her thighs and ass cheeks. Mom lifted her upper leg and placed it back. Moriah got up and helped her romancer up as well. Moriah grabbed her clothes-without putting them on-and we got into the car like nothing had happened and continued to the square. We came to another stop- this time one with vehicle traffic and hardly anyone around. I looked at Moriah curiously and eyeballed her up and down about three times before even saying a word to her. I mean, what was I supposed to say? (“Hey you are really hot!” or “Damn, I never thought you would do that…”) That just. I also began to rub her clit with my fingers, increasing the pace gradually until Valentina exploded and had a powerful orgasm. She stopped for a while and then grabbed my cock and introduced it in her pussy. It was so humid, a total flood inside my sister’s sex cave.I grabbed her big ass and used it as support to thrust. I pushed faster and harder. My sister screamed and so did I. I was on the verge of coming. I accelerated, fucked her harder, and then I came. She kept on moving, trying to. If we wanted to proceed, we would have to climb over the rock and onto the beach on the other side. Turning around, we looked back along the beach which was now full of families with kids playing in the sand whilst down towards the water’s edge dog walkers were letting their dogs off the lead to run.“We had better get a move on, I imagine the closer to lunchtime it gets, the busier the café will become.”We didn’t increase our speed noticeably and despite the feigned worry about not being able.