Em and I had always had a very active sex life. We fucked a lot, even a dozen years into our marriage, and never shied from exchanging fantasies. We also engaged in a little light BDSM from time to time. One time, well past our 10th anniversary, while she was riding on top of me, I reached up with my left hand and squeezed her throat. Gently at first, but then harder, tighter. She moaned and quivered as she came on top of me. From then on, this "love choke" became a go-to move. It never failed to make her come.
Compared to others who've been married as long, I think our sex was outstanding—we could share thoughts and fantasies freely. At some point, we started talking about threesomes, foursomes, and swapping partners. We were up for anything, including me with another man, her with another woman, whatever. We were both non-judgmental of whatever the other one wanted—one of many signs that we are so well suited to each other sexually.
Em had a very sexually adventurous friend we often fantasized about, but after sex, she would mention that she could never actually do anything with her friend, that she would prefer a stranger if it ever came to that. I on the other hand preferred to think of a real person, or real people. But honestly, whatever heightened the fantasy for each of us was fine with me.
Last summer we took a trip to southern France. For one week we were free to be lovers again, not parents or "domestic life partners." Each day we explored our shared passions, unfettered by the distractions of day to day life at home. We went to a nude beach, fucked hard on the balcony of our hotel, fucked on a deserted street while walking home from dinner, and generally reinvigorated the sexual energy that made our match so great.
As the trip was nearing its end, we spent our last night in an airport hotel next to Charles de Gaulle. It was a nice place, with a spa. We wondered down to the spa and were pleased to find no one else there. After soaking in the steam room, nude of course, we adjourned to the hallway outside the steam room, where I fucked her hard from behind while pulling her wrists back, wheelbarrow-style. We came simultaneously, as we often did, and then embraced sweetly afterward, as we often did. In a relatively new twist, I had started occasionally "cleaning her up" after sex; sometime on my own accord, sometime at her urging. This time, with some wine in me, I had no problem going down and licking my cum out of her pussy. It wasn't something I thought I would like, but, as I said, I'm up for just about anything that keeps our sex exciting. I didn't mind it, and she seemed to enjoy it.
After I cleaned her up we showered, which helped to wake me up a little, so we decided to go back into the steam room for another few minutes. We did not realize that while we had been in the shower, the steam room was no longer empty. We opened the door, naked of course, and found another couple had gone in for a steam. The woman was lying on her back, naked, on top of her towel. She had what I would call bouncy blond hair, past the shoulders, perky breasts, long legs, and a little runway strip of light brown pubic hair. The man, also naked, was sitting spread eagle on his towel. He had black wavy hair, was in good shape, and his thick cock was resting on his balls; he was also well-groomed. They both appeared to be in their early to mid 30s.
We were surprised to see them, and they us. "Bonjour," the man said with a grin. Then he asked us something in French. "Non parlez Francais," I said, and he shrugged his shoulders the way the French do, as if to say "No problem, whatever." The woman was just grinning slyly at us as she lay on her back.
My wife is not usually given to modesty but it's not every day you walk naked into a small steam room to see another naked couple staring at you. Instinctively, she covered her breasts with her hands, but quickly realized the futility of that effort. She is well endowed—voluptuous—with feminine hips and a thin triangle of dark brown pubic hair between her legs. We took our places on the other side of the small room, she lying on her back, like the other woman, I sitting on the bench below her. The other couple was no more than 6 feet away.
There was a brief awkward silence before the French couple started talking under their breath to each other. At this point the woman began rubbing her breasts slowly and squeezing her nipples gently to get them hard. Mission accomplished. I glanced up at Em and we grinned at each other. She then did the same thing. At this point I looked down to see "Francois" stroking his cock. They were looking at each other and chatting/giggling in French. He looked over at me and looked at my cock, which was growing, and said something which I interpreted as "Your turn." So I started stroking my cock as well.
Francois then got up and walked over to his lady friend, who sat up and took his cock in her mouth. At this he looked at us. Em and my eyes locked, I raised an eyebrow, she nodded enthusiastically, and it was on. We mimicked the other couple. As Em sucked my cock I rubbed her breast and pinched her nipple. Shes huddered a bit and made a little moan. Francois appeared to like this and kind of chuckled as he looked at us.