We had just bought a new house and it had a swimming pool. Tessa suggested that as it was so nice we would have a pool party. I set up a barbecue and Tessa rang around all our friends telling them that the party was at ours and to bring swimming costumes. She also told them to bring food to put on the barbecue. All our friends and kids all came and we had a great afternoon. One of our best friends Carol arrived dressed in a nice dress along with her kids. She had barely enough time to drop her dry bags when I picked her up and threw her in the pool fully dressed. She climbed out looking like a drowned rat. She had guessed that I would chuck her in and had brought dry clothes and went indoors to change. She had barely emerged from the house when I chucked her in again. This time she put her costume on. There was lots of merriment and eating and drinking. Later as the evening wore on some of our friends left, and some of them just one partner left, to take the kids home to bed. My wife dropped our kids off at her mothers for the rest of the weekend. Several of them came back minus their kids. and some just one partner returned. There were quite a few more men left than women. I put on the pool lights and some out door lights and as it was hot the adults started to use the pool. I had barely gotten in the water when Carol swam up to me underwater and from behind. Then with no warning she ripped my trunks down and as I was knocked forward she pulled them right off and threw them clear of the pool. I did the same to her and threw both parts of her bikini well clear of the pool. Then things seemed to avalanche and costumes were flying everywhere. I was enjoying watching eight or nine now naked women in the pool and several men were also naked. Then I felt something I had never been treated to before. I was being given a blow job by someone under the water. When she finally had to come up for air it was Carol. A few minutes later she was off sucking someone else under water. Not to be outdone Bev also started to give underwater blow jobs. Then again the avalanche effect happened and almost all the ladies were giving blow jobs. Tessa, although now naked wasn't one of the women giving blow jobs underwater as she does not swim. Several of the other men were now at the waters edge and Tessa went to the edge and was pleasuring one of the men's cocks. Shortly she had two to look after. One by one the ladies stopped sucking cocks underwater. I grabbed Bev as she was the closest woman to me and pushed her against the side next to my wife. Bev took over cock sucking duties for one of the cocks my wife was serving and as she did so I slipped my cock into her tight pussy. If any of you have tried fucking in water, you will know that it isn't that easy to get it in. Never the less I did get in and was soon banging away at Bev's pussy. Like sheep they followed and there was now a line of women against the pool wall all getting fucked. The few men left in the pool without a bit of pussy jumped out and offered their cocks to the women's mouths at the waters edge. They were joined by almost all the rest of the men. One of the men not taking part decided to play with the music and suggested that we all swap when he stopped the music. In just a few minutes, when the music stopped I was banging my wife as she was the next woman in the line. Then I was in Sandra followed by Millie, Claire, Georgie and finally Linda, then back to Bev. Two of the women had got out and were on the grass getting banged there. The whole thing must have lasted for no more than thirty minutes from the my trunks coming off to all the women being fucked. To this day I am not sure what caused so many people to spontaneously fuck and suck other people at the party. Was it the booze or just the hot night. Whatever it was it was great fun for most of us. What I do know is that some of those that took part were feeling guilty as there other half was not there and they had cheated. What I do know is that I got more pussy that night than I had in the last eight years of marriage. We had two more pool parties, one later that year and another the following year. Although there was some fooling around nothing like it ever happened again. In all I fucked seven women as well as my wife that night although only for a few minutes each. Over the next two years I managed to change that and have a good fuck with five of them. As for Carol who started it all, I still find time to go and fuck her ever so often. Her boyfriend as far as I know never found out about the orgy that happened or the fact that I am still seeing and fucking her. I wish I could find what triggered that night and bottle it as I would make a fortune. By the way it took two days to fully clean the pool and sanitize it after the party.