My best friend's sister

I was invited to my friend's pool house as well as her sister's. Her sister, her sister's boyfriend and her sister boyfriend's parents. Eating and chatting around the pool I watch her breasts, her ass, we make eye contact and everybody vanishes. We kiss. I touch her breasts, kiss them. Her curly brown hair flows. The evening is over and we go back to my friend's car. I"m in the middle and my leg touches her leg, my arm touches her arm. My hand moves by her own will and caresses her thigh. Again, everybody vanishes. I hear her gasp, my hand touches her further, she's so wet. And now we just can't stop...