One of my friends and his wife had recently moved into a new home a few months ago. The new home had a swimming pool which was a bonus on hot days. Any time I was over me and my friend changed into our swimsuits together up in their bedroom. In the past we had changed together so it was no big deal seeing each other naked. One thing began to occur very frequently which was a little odd. His wife would walk in on us and while we were changing. I didn't think it was appropriate for her to see me that way but my friend never made any comment to her to leave or even made mention to her she shouldn't be seeing me that way. It must have been a few weeks into her doing this that she would be out by the pool with us and began going topless. Once again my friend didn't make any comments about her tits being exposed to me and it became a normal thing. He was away on business for a week and his wife said I could still come over to swim if I wanted. I took her up on the offer. The first time I went up to their room to change and she came in. She stripped and I saw her naked from head to toe for the first time. I was a little shocked and she suggested we just swim like this and grabbed me by the hand and led me outside. We both were naked outside by the pool. We causally talked and then went in for a swim together. While in the pool she began to kiss me and began grabbing my cock. We got out and started fucking by the pool. Once done she admitted she wanted to do that for years and the wait was worth it. It happened a few more times during that week. Once my friend was back from his business trip he suggested we just swim naked from now on. This seemed strange and too coincidental so I was wondering if he knew I fucked his wife. I didn't mention anything but the 2 of us did swim naked but his wife kept her bottoms on. While at the pool they wanted to invite me to have a threesome with them. He told me he knew I had fucked his wife, didn't mind and she wanted the 3 of us to have some fun together. I agreed and off came her bottoms. We fucked by the pool and one thing caught me by surprise. I felt him try to enter me. I was pulling back at first but his wife said she wanted to see us do it. There I was with her husband putting his cock in my ass. It was a first for me but seeing how turned on she was becoming it got me turned on. From that day onwards we made it a regular thing. I think she was the one in control of these sexual encounters. We had group sex with up to 5 of us at times but she was the only female ever. She brought in other guys and sometimes if was just us guys doing things as she watched. I wasn't gay but I do admit it did feel good. She did limit who could fuck her to just her husband and me. I don't know if that was by choice or by the fact that the other guys seemed to be gay and probably didn't want pussy. I wasn't complaining but began to release my friend was more aroused by the guys than his wife. I began to wonder if he was mostly gay and I was just brought in for a toy for his wife. Either way I didn't really mind because my cock was getting satisfied by his very hot wife and as long as she was willing I was going to do it.