This is my secret story of something that happened to me several years ago, before my wife and I were married. We had dated for a long time and I would regularly join her and her family on overnight visits to their vacation home at the lake. We had all grown close and I was very comfortable there, so it was common for me to sleep over, as long as it was not with my girlfriend. (I was accepted as a friend/boyfriend, as we were not married yet!)
On this particular occasion, we had gathered early in the weekend for a relaxing time at their lake house. This was a great time to let off some steam from school. It always helped to catch some peaceful hours of studying mixed with a mini-vacation. We played on the boat for a few hours, and then hung around the house that afternoon. Instead of going out that night, we all just had a few beers and watched television. Her folks called it an early evening and went to bed. My girlfriend stretched out on a recliner while I curled into the corner of the couch. Her sister took claim of the other end of the couch I was on and we all just vegged in front of the tube.
Her younger sister was wearing cut-off shorts and had great legs, just like my wife's. I could not help but admire those two sets of legs surrounding me. After a while, my girlfriend got up to get changed for bed and her sister followed her off. As they went in to change, I finished my last beer for the night and settled myself by laying out more on the couch. My girlfriend came in first wearing her nightgown and stretched back down in the recliner. Shortly, her sister came back in, but to my delight, she was wearing a long white t-shirt for a nightgown. She tried to plop back down on her side of the couch and sort of plopped her feet in front of me since I was now in her way. It was nice feeling those smooth legs against mine and I could feel myself growing hard.