Most taboo fantasy?

Perhaps not taboo enough, but one fantasy thrilled my wife more than any other. How the fantasy got started was one sunny afternoon, when the doorbell to our condo rang. I opened the door and saw a young man, about 20 years-old. I pointed out that we had a "No Solicitors" sign. He pointed out that he wasn't selling anything, we were. I was confused and, after few minutes, we realized that he had written down the wrong unit number, as we were not renting out one of our bedrooms. I could not imagine who was. I didn't want him to have made the trip for nothing, so I showed him our condo, which was identical to all the other two-bedroom condos there. He was a nice guy, a college student, and appreciative of our efforts. After he left, I told my wife that perhaps we should rent out the extra bedroom, as he seemed such a nice fellow. That was it, but it wasn't, as he came up later that night.

We were naked, in bed, horny, and both of us were ready for some release. While I teased her by licking her inner thighs and breathing warm breath on her pubic mound, but not touching her labia or clit, I mentioned the young guy, who turned out to be a college student. I disclosed to her that she should imagine that he lived in our spare bedroom and that his ear was pressed against the wall, listening for us to make noisy sex. She responded instantly by tightening her leg muscles, so I continued. I told her to imagine that she felt so comfortable around him that she wore her usual skimpy outfits all the time, even in front of him, her T-shirts without a bra underneath, her see-through nightgowns, her short, silk, Japanese Kimono. And he felt so comfortable around us that he shamelessly eyed her legs and naked feet and peered through the transparent fabric to her otherwise naked body underneath. Upon hearing all this, her breathing had become shallow and loud.

I went on to say, between small flicks of my tongue up and down her moistening slit, that she and he had gotten so used to each other that she and he both went about the condo naked on hot summer days, that we had taken to not shutting our bedroom door when we made love and that he often paused at our doorway to watch us fuck, that she and he made an agreement that if either felt the need for sexual relief, the other would provide it. She was enjoying this fantasy, so I went on to say that he liked to fuck her in morning, before he left for school; she preferred to fuck him at night, before I fucked her. Thus, they fucked at least twice a day. She became sexually supercharged by my fantasy talk and soon was begging me to fuck her.

While fucking her slowly, I continued with the fantasy. Well, that fantasy of a young live-in lover grew in details and rich in different scenarios, such as that part of the rent he paid was keeping sexually happy or that he would sometimes interrupt our fucking to ask if he could "play through," as he would soon be heading out on a date and he wanted to fuck my wife before she went to ...... or that he liked to fuck my wife in front of his disbelieving male friends...
 
Interested in hearing others' kinkiest relationship fantasies. I'll go first...

My most taboo fantasy (and it's a long running one) has been having a long-term relationship with a cuckold couple in their 40s or 50s where the husband is allowed some helpful service roles like providing oral pleasure and massages between fuck sessions, being invited to rub and squeeze balls/nipples at key moments to help facilitate orgasms, and, when asked, helping to physically dominate the wife (holding her legs back or holding her down during penetration, guiding my cock into her, etc.).

Apart from just liking the idea of playing with a wildly kinky couple, I like the quasi-familial taboo dynamic of an older couple taking a younger man into their marital bed. In the context of such a relationship, I get wildly turned on by the idea of regularly visiting to pound the hell out of the wife while the husband takes pictures or otherwise helps out with kink play.
Wife suggested the idea of holding a mock “wedding” at our home, where she will “marry” several of her bulls,l at the same time. Even though some of her bulls are already married, this will be her “marrying ” all her bulls who will commit to bedding her when they wish. This will involve my wife wearing her wedding dress from our wedding, while the vows will be taken to fully seed the bride.

When she says “I do” then she will be told, “you may now kiss and suck on your bulls cocks”. Bulls will then be told “you may now fuck your bride” this will commence the wedding reception and all of her bulls will commit to filling “our bride”.
Y wife told me this in bed while jacking me off, she used to let me cum in her or in her mouth but now only allows me to cum on the sheets . When my wife told me this in bed I came so hard, I shot the longest strings of cum all iver the sheets, normally she would lick this off my thighs and belly but no longer. She really got off to afterwards with her massive dildo as we continued to talk about this multi groom scenario with her bulls.

My wife was n her wedding night outfit…

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