She had never been a threesome before, and now it was apparent she was going to be. She did the only thing she could think of. She put her brother in ...a sandwich. He could not believe he was in between two women, one of them his sister, no less. He was getting hot and, not to mention, hard, and he was sure the neighbor’s daughter felt it poke her tight body as she stood close to him. Then he felt his sister’s hand run down his side and inside his boxers to find his cock standing at attention.. My girlfriend had already had a few drinks and so after a couple of glasses of wine was nicely mellow. There was no moon and the lights on the shoreline made the beach seem very very dark as we were a way off from the sea path close to the sea. The sound of the sea blocked much of the sound of people walking about along the beach.After a short while, with my lovely gf a bit buzzed from the drink I stripped her naked and, having pulled down my shorts, I entered her lovely pussy. After a while. A gentle throbbing sensation like someone was licking her insides. Then the shaft began to twist slowly, the ribbed plastic feeling like it was burrowing. The central rod vibrated with a mechanical hum sending shivers up inside her, the beads shifted and dances around the shaft making the whole length seem to pulse with life. And finally the wheel began to turn the whole length pumping at one thrust a second, the thrust pushing the cock 4 inches in then pulling 4 inches to the rear of. It's like our own private showing." She smiled.As we were watching, we were holding hands. Suddenly, I realized that we were more-or-less alone and we could fool around. (I know- why did it take so long?) I pulled her hand to my lap and started rubbing it against my cock- which was straining against my jeans. My GF seemed not to realize what I was doing for a minute. Once she did, she automatically pulled her hand away. But then she smiled again and reached down and started stroking me on her.