This a true story. My wife and I were recently married, it was the 1970s and sex was everywhere. We both worked in a large IT company. The majority of employees were young, playful and somewhat eccentric.
My wife, Carol, liked to dress in scanty clothes. She was a bit of an exhibitionist. She had the perfect body for it. She had large firm breasts and a round ass.
One summer there was a company wide dare for a single man to take a married woman to lunch. Carol went with a particularly good looking guy and had a great time. That started some sexy bed time talk. I would whisper in her ear while we were having sex "would you like to fuck him?". She would get wet and groan.
We invited him to our place for dinner. She wore a white gauze top and her tits and nipples were on full display. After dinner and much flirting, I showed him some sexy pictures I had taken of her. I said I planned a photo series called Carol 29, where I would capture her at her prime. I asked him if he would like to help with the project. He said yes.
We took several pictures of her in scanty clothing. Soon we were spending evenings at his place, at restaurants and dancing at a local nightclub. A lot of sexual tension developed. When we stayed at his place Carol said she didn't want to get her work clothes wrinkled. He, Bill, lent her a T shirt to wear and she wore it as a very short dress. She would sit on his couch cross legged and he and I got peeks of her very sexy underpants. Bill had a stuffed dachshund on the couch and Carol would move it back and forth suggestively under the T shirt while we talked. He and I were aroused.
When we had him back to our house she would dress provocatively and find many reasons to touch him and to bend over so he could see her breasts.
When we were alone I'd whisper in her ear "I'd like to watch you fuck him, or would you like to fuck us both?" This always got us horny and we'd have wild sex. As time went on it became obvious we would go through with it and have some three way sex.
Soon we were staying late at his place into the early morning. She was still in the T shirt but had by now taken off her bra. We'd have some drinks and smoke some weed. Finally one early morning I said we should all go lay down in his bed. Once we were there with her in the middle I said to her "go ahead and kiss him, you know you want to."