I had promised that I would tell this story about jerking Bill off on a balcony. It had been during a party. We had gone out onto a large terrace balcony to get some air. We had only been silently staring at the view for a few minutes when we heard the distinct sounds of a man and a woman having sex. Sure enough, in the shadows on a chaise lounge was a semi dressed couple going at it with utter abandon and totally oblivious to our presence.
Bill was standing behind me and had put his hands under my arms, embracing my breasts and my hardening nipples as he had. I could feel the tell-tale bulge in his pants from watching the erotic scene. I unzipped his pants and began to stroke his now very stiff cock. As the couple quickened their pace of rhythmic penetration, Bill had begun to buck his hips against me and I had tightened my grip on his cock, pumping faster as he had prompted. I had hiked up the side of my long dress and had eased my fingers into my soaked labia, using two fingers to stroke around the hood of clit. One of Bill's hand had joined mine, reaching into my vagina and up my sensitive slit, sending sharp jolts through my body.
Pretty soon the couple had started to come with moans and groans rising to a quickened crescendo. We weren't far behind them. Bill grew still and his body taught as I felt his cock jerk and tremble in my hand. He noisily shot spurt after spurt past me onto the floor. Just as the couple had glanced over at us, I came as well, slumping backwards into Bill in doing so. We all had just looked at each other and had laughed. Thankfully no one had thought of joining our happy foursome on the balcony.