We discussed it many times about what it would be like and things she would do to me if she got the chance. Little did I know that while we were talki...ng about it, she was taking lessons on how to become a dominant. Ty knows a couple that practice a sub/dom relationship in the bedroom and she asked them for some tips. She had been going over and taking some lessons, learning about the mixture of pain and pleasure, and all the tools you can use. She had come to me one Thursday evening asking if. I followed and crawled on top of her. Our lips touched. Her arms and legs wrapped around me. While our tongues danced, her feet pushed the towel away. She pulled me down; her pelvis lifted and pressed against my penis.We’d played like this before but always kept things under control. Rebecca would press against me, and I’d provide a rigid counter for her soft warmth. Tonight, with no need for restraint, I ground my erection against her in a tight circle. Rebecca gasped; I had never been this. There was no room to move away.The long road trip had started. The large bus was much louder than I had expected. It was difficult to carry a conversation from the noise of the powerful engine, so most people remained silent, except for the occasional small talk.As the trip went on, most of the older nudists began to doze off and sleep. There wasn't anything better to do, plus everyone had woken up early that morning.I eventually got used to feeling my sister's body pressed tightly against. His fat cock felt wonderful inside of me. It felt just as exciting as his father's slightly larger cock had felt when he raped me in my bedroom when I got home from work today.Neither one of us was able to put up with those long, slow strokes for long, though. We were both extremely excited and I was afraid that he wouldn't be able to last long enough to bring me to orgasm one last time. He was obviously very close to cumming himself.He started slamming his cock into me rapidly. It felt great.