It all started very innocently. Patty and I just installed a pool with this huge deck around it and invited about 40 friends over to christen it. One of the couples invited was Joe and Angie. They were the parents of one of Patty's kid's friends. Joe was a Jack and Coke drinker and Angie a beer drinker. I had never meet Angie before but she was a looker. Not very tall but a very pretty face and a body to match.
Our parties are always very casual with everyone helping themselves to food and drinks. I spent most of my time around the bar and the grill doing burgers and brats so I didn't get much time to talk to Joe and Angie until later in the night when they wanted to start doing shots of tequila. There were about a dozen people left when Joe started pouring the shots. Most people were feeling no pain by this time so the shots went down pretty easy.
After the second shot Joe said he had to go take their baby sitter home. He said he'd be back to pick up Angie later. It wasn't long after he left that the party moved into the pool. I turned the pool light on and jumped in. Several people, including Angie, didn't have swimsuits but that didn't stop them from getting in. Angie and another girl took their shorts and bra off to swim in just their thongs and tank top. Everyone was in the pool having one hell of a time drinking and just being stupid.
With the pool being new we didn't have all the kinks worked out yet. The pool light would turn off every couple minute and would kick back on after a few minutes. I wasn't in a state of mind to worry about it so we lived with it. Since we live out of town every time the light went out it was pitch black. When the light went out for the fourth or fifth time I felt someone grab my ass. I figured it was Patty so of course I return the favor. Instantly I knew the ass I was squeezing wasn't Patty's. I've squeezed hers enough to know this ass was slightly larger but yet very firm. When the light came back on I realized it was Angie's. She gave me this sexy look out of the corner of her eye. Instant hard-on! I knew the next time the light would go off I was going back to Angie.