My wife and I are both in our 40’s. Carol is a good looking woman, looks after herself with visits to the gym two or three times a week and the only thing she says she would change about herself would be her breasts. They are big DD and soft, she has hinted at getting a reduction for some time but I think they are fine as they are. Carol is not an extrovert, she never flirts even though men flirt with her and she has been propositioned plenty of times but never encourages anyone so this is so out of character for her I still struggle to believe she has done what she has. We went away to Spain recently; the weather was ok and was warm for the time of year. We like going at this time because it’s not busy and so there are no crowds. Where we go is secluded and is known as being used by naturists so although people don’t; go around naked, you may end up passing people naked on a secluded part of the beach or in this case, using a shower just off a secluded part of the beach. Carol had said a few times that she felt she was becoming boring and life was slipping her bye and we chatted about spicing things up and so on but never even mentioned sex with other people or anything remotely like that. Then we passed a Spanish guy, about our age, maybe a bit younger, rugged, good looking who clearly took a shine to Carol, didn’t seem to speak English but managed to say hello. Carol was quite taken with him and joked to me that she was going to faint and whenever we saw him, she would whisper for me to hold her because her knees were going to buckle, and he would look my wife up and down and especially her chest. So, we are walking on the beach, my wife in her swimsuit and a shawl and me in my shorts and t-shirt when we pass our Spanish friend, completely naked under an outdoor shower just off the beach near some dunes. Carol squeals and is out of breath, all I hear is OMG he’s huge, then she turns to me and apologizes. Our friend waves and Carol waves back and laughingly tells me that she feels the need to take a shower, so I dare her, I tell her to go and have a shower and remind her that she said that she felt that she was becoming boring and old and I dared her. With that our Spanish friend beckons her over. Carol is saying no, no, no that would be silly, I said that she should do it, do it as one of those bucket list things and maybe he will take advantage of you and we laughed. Carol said ‘but what if he does, what if he tries something’ so I said that I promised not to watch and would meet her at the hotel. I had one of those ‘I can't believe you said that’ looks so I backtracked and said that I would be close by and for her to just get under the shower for fun and see what he tried and reminded her that she could always run away. Carol walked towards her friend, I walked away but not before she was under the shower. I stopped just out of sight but still able to see her in case he tried something on that she didn’t want. There was a part of me that wanted her to just walk away but a also part of me that wanted to see her with another man. I have never wanted her to have an affair and I would have been devastated if I found out that she was having one but this was different, this was just naughty. I was desperate for a pee so went into the dunes, I was gone for less than 30 seconds when I got back to my hiding spot. Just in time to see our Spanish friend put his hands on the straps holding Carol's swimsuit up, he pulled them down and my wife's breast fell out. He took one then the other in his hand and massaged them. My wife glanced around, I guess to see if anyone was looking, then she took his soft cock in her hand and started to massage that. For a minute or so he felt her breasts whilst she made his cock hard. She just stood there and slowly tossed him off whilst he felt her breasts. Carol looked up at him then looked around and then back down to his cock which was now semi hard. My shy quiet wife lowered herself to her knees and put his cock in her mouth. He stood there slowly thrusting his hips fucking my wife’s mouth. I was hard, I looked and checked no one was nay where near us and dropped my shorts and started to have a wank. This went on for some time until I came on the floor, I wondered if Carol was going to pull away before he ejaculated into her mouth. He pulled away and bent down kissing her on the mouth and pulling her swimsuit off. He opened her legs and was going to shove his not solid cock in her pussy but Carol pushed him away and to his credit, he stopped and stood up. Carol put his cock back into her mouth and continued to suck him off, moments later he gave out a grunt and thrust himself into Carol's mouth a few times, Carol spluttered, this guy had just cum in my wife’s mouth. She pulled back and swallowed, I think I saw another splash onto her tits. Carol just got up and washed his cum off her and got dressed swilling her mouth with the water from the shower. They kissed each other on the cheek and Carol walked away. I had dressed and was waiting for her around the corner, I said ’ok?’, my wife said ‘ok’ and we walked back to the hotel without talking. Eventually, I asked her fi she had enjoyed, I admitted to watching and aid it was ok, we hugged and she apologized. I told her not to and that I had put her up to it and I even suggested she does it again if she wants. The very next day, around the same time, we went for a walk wearing pretty much the same as we did the day before. Our Spanish friend walked ahead of us until we arrived at the shower. I stopped and let her go, it was like handing over the love of your life to her new love only I knew there was no love there for him just lust. I went to the spot I had used before and kept a look out. No sooner had they stood under the water what Carol and her friend where naked, his cock in my wife’s hand and his hand between her legs, the two of them pleasuring each other with their hands. Then he grips her breast and sinks his tongue into her mouth, Carol doesn’t seem to know whether to grip his ass or his cock and goes from one to the other. Then he spins her around and gripping both her tits runs himself against her ass. I couldn’t tell if he had entered her ass but Carol was moaning and whimpering, then she falls to her knees, her tits swinging as he pushes her legs open and then she lets out a cry, her friend was inside her and fucking her from behind. I had missed another younger couple who had stumbled on my wife and her lover, they stood a few yards away watching until the too where on their knees fucking and doggy style and watching. My wife was being pounded hard, she was crying out and I was sure she would attract a crowd but it was just me and the other couple watching. In the end, I took my cock out and had a good wank, I watched my wife being hammered and the other couple with her small tits squealing watching my wife and then me wanking. I think all of us came at the same time, I shot cum into the floor at the same time my wife announced that she was summing and the young girl a few yards away moaned and shook coming out with a lot of ‘yes, yes’ and ‘fuck, oh fuck’. Our Spanish friend just roared. He pulled Carol onto her calves and gripped her tits from behind kissing her neck and face. The other couple walked over to me and started on about how hot that was and how lucky they and I were to have come across that. I couldn’t resist, I pointed at Carol and said ‘ that my wife’. The two of them took a step back ‘no way’ they said ‘ that’s fucking hot’. When Carol and I walked back to the hotel the younger couple joined us and didn’t even try to hide from Carol the fact that they had just watched and fucked whilst watching. To my shock, Carol didn’t, seem to care. When we arrived at the hotel lobby the younger couple walked in with us, ‘any chance of us coming to your room and doing a swap?’ Carol looked at me and said ‘ why not, let's make a day of it’. Minutes later I had a small firm tit in my mouth and a young man was sucking hard on Carol's ample breasts with his fingers deep inside her pussy followed by a good shag. Her pussy was nice and tight and she was very vocal whilst I fucked her. Carol demanded that her new younger lover fucked her hard, and demanded he not stop. In the end Carols, young lover filled my wife with his young seed and I returned the favor with his young lady with a lot of groaning and foul language. Carol never saw her Spanish lover again but we did fuck our young British friends once more. She loved it in the ass which was a first for me, banging her from behind whilst gripping her small hard tits whilst my wife rode her lover, her breasts swinging and bouncing, her nipples growing big and red. Carol admitted to cumming so hard every time that it exhausted her. If our young lovers had their way we would have all fucked every day but Carol and I decided that we had ticked that one off the list and respectfully declined. Her Spanish lover came around once or twice but got the message. Since our holiday Carol and I have had an amazing sex life, fucking every way we can think of, Carol now likes to have me cum on her face and tits and makes me clean her with my mouth before sucking her tongue. I’m not saying we will never swing again but that experience was so unexpected and dirty I thing we have had enough for a while.