The reason that I asked, Red and I went to see friends at their house after work, a couple that we knew from before they were married and before Red and I were involved with the others in our family, i.e. before we started nonmonogamy. We have never adventured into anything sexual with them and as far as I know they are vanilla. I had brought clothes to change into from my business attire and did so in their bathroom. After a while, and a few drinks on their part, a comment was made about the fact that I wasn't wearing a bra, then a comment from her (she has never shown a Lesbian side) expressing curiosity about how nice "those puppies" must look. I told her to peek if she wants (I always give the uninitiated the control) and surprisingly she pulled up my shirt not only for her to look, but her husband as well. It was fun so I pulled it the rest of the way off and we spent about an hour talking with me topless. Her husband unbuttoned her shirt and she was comfortable sitting there in her bra. We talked some more, they drank some more, and when she got closer I put her hand on my breast. Her bra came off and we had a girl-girl feel up. Toward the end of the evening he felt me up as well, but it was pretty clear that he didn't want Red touching his wife. Fortunately Red was socially aware enough to have picked up on it and played it all right. For a variety of reasons (including their drinking and occasional pot use), neither Red nor I could see being full-on sexually engaged with this couple, however, what we did was fun and I could see doing it again.
I called her up the next day and told her that we had a wonderful evening and to make clear that I had no regrets, and to take her temperature. She was fine with me being barebreasted in from of him, he of she touching me and me, her; he maybe a little uncomfortable with Red seeing her tits. So the question: is this a sustainable situation, breast play with them, maybe total nudity, maybe a little more Lesbian involvement? Or are they likely to want to tip one way or the other?
When we got home, I made a point of telling David about the evening, he was just glad that we had a good time. Clair and Lora, however, thought that since these are people that I would never go all the way with it is a bad idea to do anything like it again.