Shelley pushed back against me and began to buck. I couldn't believe it! I was fucking my beautiful, cock-teasing sister. I grasped her hips and began...to grind myself against her so that her nylon-clad thighs rubbed against the delicate skin my own thighs.My sister lifted her buttocks up off the lounge and wriggled her crotch; her sopping vagina squeezed my shaft, it was devine. She was much tighter than my mother.With reluctance I pulled my cock all the way out of her velvety tunnel. I was. "Zack and I danced a few times in the living room, but I guess you knew that" she started. "He danced me around the corner and into the hallway a couple of times. We always ended up kissing when no one was around. He was constantly squeezing my ass and pressing me between himself and the wall when we kissed. I was getting hot. I guess he could tell I wanted to do more than kiss. He kept trying to take me to one of the bedrooms and I finally told him to ‘forget it'. I was sure someone would. Her ass and legs were sculpted with muscle and moved with fluidity even outside of the pool. Her shoulders were strong and square and served to emphasize the dramatic narrowing down to her tiny waist.Tiny was the word. She was tiny and sexy and she pulled it all off with a sexiness that could be thousands of degrees Celsius one moment and Absolute zero the next. As she approached her heat rolled in front of her like a furnace. He watched as each undone button revealed just a little more. .and had very captivating bright blue yes. For a lady her age, I saw very few wrinkles in her skin. She was wearing a light pink sleeveless dress which buttoned up the front, and had a loose full skirt. Her shoes were black mid heels, and due to the weather, she had no hosiery on. "Will you have a soda, Mrs. Gayle?" "I'm sorry there aren't any chairs out," I said. She replied, "Thank you, Trev...yes, I'd love a soda, and I can just sit on the fresh cut grass," she said. So, she demurely sat.