This is actually MFMF because it involves another couple.
My wife and I have been members at a nudist resort near our house for several years. We enjoy going there to relax on weekends and work on our 'all over' tan. Most of the people there are a little older than we are and we have never had any sexual encounters with anyone there until this past summer.
On Saturday evenings, the resort usually has a special party in the bar with either a band or a DJ. We usually don't attend because it starts about 10PM at night and goes until really late. We are both runners in the morning so we rarely stay up past 10. On this weekend, we were feeling like having some fun and decided to head out to the party. Since it is a nudist resort, people show up at the party in all kinds of outfits from revealing, see through dresses to totally nude. People dance and the entire atmosphere is fairly provocative.
We got there at about 10:30 after my wife agonized over what to wear or not wear. She settled on a sarong with nothing on underneath. Basically, the sarong covers the body but you can clearly see she is naked underneath. We had some drinks and danced for a while and we were both having a great time.
After a little while, a couple came up and introduced themselves. I call them Brandon and Kim. We chatted and socialized while we had another drink together. They were about our age and both looked to be in good shape. We were clearly having a nice discussion with them and they were being pretty suggestive sexually. Based on what they were saying, I figured out they were into the 'lifestyle' which means they were swingers. This is not uncommon at nudist resorts but something we have never been into.
Brandon was pretty athletic and in good shape. I could tell he works out a lot. Kim was pretty tall and had a fantastic body. She was dressed in a little white wrap around her waist and was topless. She had spectacular breasts and was not uncomfortable showing them. I had trouble keeping my eyes off them.
A little after midnight, they asked if we wanted to head back to their place which was a Park Model mobile home at the resort. My wife and I looked at each other and uncomfortably said yes, suspecting they might be suggesting we swing with them. We had no plan to swap partners so I got the nerve while we were walking to their place to mention to them that we did not swing. They laughed and said they knew we were not into swinging. That was OK with them and they just wanted to have some fun back at their place.
When we got there, we all stripped off what little clothes we had on as soon as we got in the door. In no time, both couples were making out with our spouses and we were clearly about to move toward having sex in the same room. It was mostly dark in the room so I couldn't really see what they were doing but I could tell they were getting into it just a few feet away. Very erotic. All of a sudden, Brandon hops up and asks if he can turn on some dim lights, we didn't really object but neither one of us knew how to say no either. He turns on a couple of lights and then suggests we slow down a little and have some fun. He goes on to explain that he and Kim get really turned on by masturbating with other couples. Now that he has the lights on, I can see he is hard as a rock and ready to get into it. My wife doesn't say anything but I can tell by the way she is smiling that she is OK with it. She pulls me on top of her and just went on making out.
A few minutes later, both ladies were laying on their backs next to each other on the living room floor. Both girls were jilling and fingering themselves while Brandon and I are on our knees masturbating. It was so amazing watching the two girls enjoying themselves. Neither one touching the other but so close to each other that they were rubbing shoulders together. Both were clearly engrossed in pleasuring themselves. Brandon and I were next to our wives and kneeling on either side which made us several feet apart. I had no interest in watching him jerk off but the fact that he was watching my wife get off was very erotic. I think both girls were very into being watched which was a complete shock to me. I never thought my wife could be so uninhibited. She was stimulating herself in front of another couple and was completely lost in the moment. It all seemed very surreal and I was over the top stimulated by the entire scene.
Our little session went on for quite a while, both guys were helping their wives with a little hand simulation. My wife was soaking wet from being so turned on. I would take some of her wetness and use it to lube my cock which was so hard from all the stimulation. I could tell that all four of us were about ready to explode when Kim starts moaning and lifting her butt off the floor while she went at her clit really fast. She popped into big orgasm with a lot of screaming which seemed to kick my wife off into her orgasm. She was not as dramatic but she also had a major O with a lot of sounds as well. While both girls wiggled around on the floor I could not hold out any longer, I started to cum all over my wife but it shot so hard that it also landed on Kim's stomach and tits. Kim was totally OK with this and immediately started to massage her nipples with it with one hand while bringing herself to another orgasm with the other. Brandon also unloaded his cum on her stomach and she just mixed it all together with her hand. She was totally hot at this point and probably climaxed 5 or 6 times. One right after the other.
About 10 minutes later we were all totally drained and feeling a little awkward. Cum everywhere and both girls trying to clean up. Kim hops up and takes my wife back to the bathroom where they both junp into the shower for a quick rinse. What an incredible experience. Brandon and Kim have a lot of experience with this but we were completely new to couples playing together like this. Needless to say, we went our separate ways that night but caught up with them again the next day. It is always a little strange to see somebody the morning after once the alcohol has worn off. We said we all enjoyed the night before and we had to do it again. It hasn't happened yet but my wife and I have talked about it at least 20 times since that night. We would both look forward to doing it again soon.