In the small town where I grew up, two streets of houses were separated by a field. Across that field ran a path from the back of one house to the back of another in the other street. In one house lived two sisters; in the other, a happy husband and wife, with all four living a happy harem life. This was fifty years ago when those arrangements were deeply frowned upon. That said, it worked well for all of them, and soon enough the gossip ended.

Years later, I was staying in a fairly small and remote village in the Middle East. The children there decided to give me a welcome by setting off fireworks at three in the morning. Chaos ensued, with dogs barking, lights flashing, and people in various stages of undress rushing back from where they were to where they should be. The children were rolling around with laughter at the mayhem they had created.

My name is Jonathan Rogers, and I'm married to Ann. We have been married for over 26 years, and our two children have flown the coup. We were comfortable, even boring, or so I thought. Little did I know.

For me, it all started with a failed business trip. It was only on arriving at the airport that I heard that my flight had been cancelled. I had removed the SIMs from my mobile phone and couldn't be bothered to queue for the overworked landline. All I could do was return home. At around 1.30 in the morning, I got home, and out of consideration for my supposed sleeping wife, quietly went into the house.

I undressed downstairs before creeping upstairs. The bedroom door was slightly open, granting me a glorious view of a naked woman bent over the foot of the bed. She had her nose and tongue between the cheeks of another woman who was on all fours. I recognised the woman being licked as my wife, Ann, who was, in turn, expertly giving head to a man sitting at the top of the bed, eyes closed, with fingers entwined in my wife's hair.

For a moment or two I looked on in shocked silence as the three of them performed, blissfully unaware of being watched. My cock, by pointing straight at where it demanded to go, and now fully upstanding, rock hard, had decided that my participation was the only option.

Gently parting the unknown lady's lips apart and allowing her wetness to moisten my shaft, I guessed there was a welcome on the mat. The next moment she backed onto me, fully enclosing my member. I grabbed her hips and humped like there was no tomorrow.

My wife, no longer being spit roasted, rolled onto her back. Seeing me, the blood momentarily drained from her face, before realising who and what I was doing. She smiled knowingly, before guiding the other man's penis deep into her.

Morning came, and I awoke alone. I reeked of sex, so a quick shower seemed in order. What do you wear for possible introductions to a man who has fucked your wife, while you screwed an unnamed woman you had never met before? Casual seemed appropriate, a T-shirt and shorts. With the smell of fresh coffee wafting upstairs, I nervously went down.

My wife, looking decidedly well fucked, did the introductions to a nervous Dave and his glowing sister Molly. Then came an awkward silence, which I broke by asking for a coffee and offering to cook breakfast for everyone. While cooking, I let out that the previous night was some of the best sex I had ever enjoyed, and please can we do that again, which removed much of the lingering embarrassment.

Ann asked if I wanted to know anything, which of course I did. She told me that it started about six weeks ago, when I was away. Ann came down with the flu, and Molly, living two houses down, came to see if she could help by nursing her through that. The flu came and went. A few days later Ann invited Molly and David to a special Sunday lunch as a way of saying thank you.

The traditional Sunday lunch was roast beef, Yorkshire pudding, and all the trimmings. To wash it down, Ann bought three bottles of Barolo, way over the top, but it was Ann's favourite red wine. In the warm afterglow of a great lunch and a bottle of wine each, the three took refuge on the couch, with Ann in the middle.

In that conversation, Ann discovered that David and Molly were actually brother and sister. Several years earlier, David's marriage fell apart when his wife started screwing around with the junior partner in his structural engineering firm. In the later, acrimonious divorce, David walked away to stay with his unmarried sister.

For her part, Molly had many relationships over the years with men and women, but never with any desire for permanence. On her life's journey, Molly had been the one pushing her sexual boundaries. When David turned up one weekend, with a suitcase and a pile of boxes, Molly believed that her experimentation would, at least for a time, end. How wrong she was.

On hearing this, a tipsy Ann wanted to know all the intimate details. David told Molly to tell the story, thereby giving his permission. Molly's house was only two-bedroomed, and Molly used one as her accounting office. David could either sleep on the couch or share Molly's comfortable king-sized bed. David chose the bed, and all went incident-free for a few days.

One evening after pizza, three bottles of Riesling between the two of them, and a soft porn movie, the atmosphere became charged. David went upstairs and lay down on the bed. Molly finished her glass of wine before joining him. Molly, not sure if David was sleeping, said that she had a voracious sexual appetite. David asked if she wanted him to leave. Molly said no, confirming that at her age, she couldn't have children, so it didn't really matter that he was her brother.

Molly slowly pulled her top over her head, making sure to show off her curves to best advantage. Without going near each other, they both slowly undressed and climbed under the duvet. At first, they were tentatively touching each other. Fingers gently brushing skin, with each knowing what to touch, and when. The touching became stroking: shoulders, neck, cheek, lips, and arms.

Ann, cheeks flushed, continued listening quietly. Ann was noticeably getting turned on. David, seeing this, began touching Ann's hair and neck. Whether it was the food or the wine, Ann moved into those gentle caresses, saying nothing. Molly continued recalling their first time.

Molly's breasts and nipples were demanding attention, and David complied by stroking first one breast, then the other with light fingertips moving towards Molly's nipples. That became his tongue drawing circles, before David sucked each nipple in turn. Edging slowly down the bed, David kept stroking, licking and kissing his way down Molly's body, before burying his face in Molly's bush.

By now, Ann was becoming decidedly horny, pulling David's hand onto one of her breasts. Molly, for her part, began stroking Ann's thighs. Ann never heard the end of that union, preferring instead to experience it directly from both of them. The living, sensuous and erotic experiences being far, far more satisfying than anything she had ever had before.