This all started about 5 years ago. The wife and I are very open with each other and both of us have had other sex partners. Due to the age of our kids, we decided to stop that for a while. The older the kids get, the more they realize, and we don't want them to ever know of that. Anyway, during the time we had other partners, my wife always liked my best friend Kevin. She talked about having sex with him, but we decided at the time that we should not involve him because he was such a close friend. After we stopped seeing other people, she brought him up again. I told her again that it may not be a good idea to let him know that we are open to things like that. She agreed. One night we were all at the casino partying and having a great time as we usually do. She was flirting with him quite a bit. She usually does but that night I noticed she was all over him. He was loving every minute of it. She went to play some slots and Kevin and I went to the bar. We were having small talk and he said out of the blue how hot she is and that I am a lucky man. Without even thinking, I said that he could be lucky too. His eyes about popped out and said what do you mean? I said you know what I mean. he said holy ****, you can't be serious. I said yes I am completely serious. He sat there stunned. I told him that she and I have had other sex partners and that was all it was, was sex. Much to my surprise, he told me that he was seeing another married woman and her husband allowed it. I was stunned. Here we were best friends in the world, and we didn't know that about each other. So I told him how my wife was interested in him and he told me he was interested in her. So, we set up a surprise. I told him to get a room and get an extra key, and I would do the same. Then when we went to go to bed, I would tell her to go to his room and give her a key. He left and came back and handed me a key. I said what's this? He said that he paid for both rooms and we didn't need extra keys because he got adjoining rooms. I said cool!
We went and found her and watched her play slots. I told her that we got rooms because we were getting too drunk to drive. She said that was a good idea. She stopped playing slots and we went back to the bar. We had a few more drinks, she again was flirting with him, and he was soaking it up. We all decided it was time to go to bed and we all walked to our rooms. She had no idea what we were planning. I got undressed and got in bed. She did her usual and washed her face and brushed her teeth. While she was in the bathroom, I heard the lock open on the door going to his room. She came out in some sexy lingerie and got in bed. She cuddled up to me and I gave her a huge kiss. I looked at her and said that I have a surprise for her. She asked what it was. I pointed to the door going to his room and said, see that door? She said yes, and I said, Kevin is over there waiting for you. She sat up quickly and said, what do you mean? I said he is waiting for you. She said, you mean.....I interrupted and said yes, and he is probably already naked. She gave me a huge hug and asked when did I talk to him, and I told her that I talked to him when she was playing slots. She couldn't believe it. She gave me a big kiss, thanked me and then got up and went through the door. She came right back in and asked if I wanted her to come back to bed after wards. I told he no, to just stay in there with him. She gave me another kiss and went on over. I stayed awake for a while and could hear them having sex. It was fun.
The next morning she woke me up with a big smile on her face. I asked if she had fun and she said, oh yeah, we had a great time. I laughed and asked how many times She laughed and said at least 4, maybe 5. I laughed hard. She got in the shower and I went over to his room. He was sitting there watching TV. It was kind of awkward at first, but that went away pretty fast. We talked about it a little and he thanked me for letting her come over.
They still get together on a fairly regular basis. Sometimes they'll get together a couple times in a week, then sometimes they'll go a month or two without seeing each other. They both have a lot of fun. She enjoys sex with him and he with her. It's all good.