We went on a weekend getaway with another couple and things got unexpectedly interesting. My wife and her best friend from high school decided they wanted to see each other and the husbands had to tag along. On that first night while we were all drinking when me and the friend were in the kitchen by ourselves she grabbed my dick and kissed me then proceeded to apologize and said please don't tell your wife. Me being who I am, I asked what she would've done if she saw us making out and she says started sucking her husband dick until he moaned loud enough to get our attention. We laughed about it, but I asked seriously, how she would respond and she said was being serious. The next day was kind of awkward between me and her friend and my wife could sense that something had happened. Her friend pulls her in the bath before she got into the shower and decided to tell my wife what happened. My wife calls me and her husband in the bathroom tells him and kisses her husband slowly and passionately, then just walks into the living room like nothing happen. I follow and ask a couple questions to see how mad she is surprising she said it was not a problem. They came along and finally joined us and the conversation turned sexual. My wife asked me in front of her husband if I wanted to fuck her and I didn't respond She then grabbed her friend's husband by the hand and says we're going upstairs and we will be back in the morning. Me and her friend just stare at each other after we heard the bedroom door close. As we are talking i start hearing my wife moan and i start masterbating and telling her everything i want to do with her before our evening began. The next morning we all got in the shower together and when we got out the shower had sex with our spouse in front the other couple. That last night we had our first swinging experience with anoter couple at the same time.