When Sally first started modeling for our group she had a nice muff of dark pubic hair that I loved moving my face through. But after a few sessions everyone noticed that it started getting sticky and matted from her juices, so she chose to have it removed. She had it done professionally, and now she's smooth all the way back and underneath. I really like that. It's a lot easier to breathe when I'm told to put my face directly on her pussy, or maybe up underneath her bottom, as some of the poses call for. I don't have a beard or mustache, so we're really skin-to-skin.
One time while Sally and I were holding each other face-to-face, my wife came over to place my cock just against Sally's entrance, which started opening up around the tip of my cock. I could feel the wet, and within minutes her husband stepped up to gently push us together so the head of my cock slipped inside her labia. They asked us to hold that pose for twenty minutes. By the end of the twenty minutes my cock had extended to go further inside her, but nobody seemed to mind. My cock was rock hard when I withdrew it, releasing a small gush of Sally's juices onto her thigh. That was really the only time I got to actually be inside her. I know Sally liked it, because she kept flowing the rest of the session, and her breathing was heavier. I liked it a lot, too, and I hope we get to do it again. But only if our spouses initiate it, like that time. I asked my wife about it later, and she just said she thought it would be fun, but she had no idea Sally's husband would push me further in!
Sally and her husband and I and my wife spend a lot of time together, mostly at clothing-optional beaches or resorts, so seeing each other naked, all four of us, is nothing new. But it's always exciting, especially when my own wife strips off and she and Sally's husband joke around imitating the poses Sally and I do.
Sometimes on the beach Sally and I work out new poses together, to have something new for the next time the artist group gets together. Once in a while we'll be locked in an especially close pose and one of the beach patrol persons will come over to remind us "no sex on the beach". As soon as we tell them we're models, everything seems to be OK. Meanwhile my wife and Sally's husband are howling with laughter as soon as the beach patrol leaves.