I guess I need to start with a little background. My wife is the next to the oldest of five daughters in her family. She has an older sister who is three years older then she, and three younger sisters all three to four years apart. We are closest to her next youngest sister Julie and her husband Pat. Patty and I had moved to a larger city, about fifty miles from our hometown, right after I had graduated from college. We would make the trip home about once a month except in the fall during hunting season and then it was almost every weekend because Pat and I did a lot of hunting together.
It was after one of Pat's and my hunting trips that all of this took place. Julie and Patty had gone shopping while Pat and I had gone hunting. When we got home we were really tired and all we wanted to do was sit down to supper and maybe watch some TV and crash but Julie and Patty had other ideas.
I was an avid photographer and had a dark room in the basement and it seems that Julie and Pat had some rolls of pictures that they wanted me to develop and mount into slides. After supper we went to the basement and started developing the slides. I really wasn't paying much attention to the subject matter of the slides until the girls started giggling and whispering between the two of them. As I looked closer there seemed to be many light areas on the pictures. I thought I had over exposed the film. There was a lot of over exposure all right but it was Julie that was overexposed. There were three rolls of film and they were all of Julie posing naked or she and Pat in very compromising situations. Now Julie, by far is not an unattractive woman. Some might call her buxom as she was about 5'4" and weighs about 140 lbs. All of her extra weight is in the right places as her breasts are probably 36 DD and her butt is nicely rounded. It was very hard to see much detail just looking at the slides but what I could see was causing a bulge in the front of my pants. Patty noticed what was happening and walked up behind me and reached around me and began stroking my erection and kidding me about it and asking me if I would like to see the real thing. I said "your damn right but then Pat might expect to see the same from you".
Needless to say being an amateur photographer and having a sexy wife I had taken my share of nude photos of Patty.
"That might be alright too." Was her response.
This surprised me. We had fantasized about adding others to our bed and Julie and Pat were two of our favorites to fantasize about.
It seems that when Julie and Patty had gone shopping they had ended up at Fredrick's and Bought a few things they thought might be fun to model for us. This again was a shocker as in all the years we had run around together the most that had ever happened between us was to flirt and maybe rub against one another when we were dancing with each other's partners.
While the film was drying Julie and Patty went upstairs and changed to start the fashion show. When they came back down each had on a bustier that had the crouches in them, Patty's in black and Julie's in green. They each had on thigh high hose and high-heeled shoes to match the colors of their bustiers. Each showed a lot of skin. When they walked in they didn't go to their own spouse but to their brother-in-law. They each and made sure to put on perfume and the scent was so enticing. They got very close to each of us but made sure we didn't do any touching. And then they were gone again.
The next outfits consisted of push up bras and matching thong panties. I noted that Patty must have done some trimming as there was no hair around the edge of the panties and she usually has a rather profuse growth even though I have asked her several times to do some trimming to avoid getting hairs stuck between my teeth. Each leaned in and gave us a peck on the cheek, making sure that each of us got a good view of their cleavage. They then turned around and wiggled their butts in our faces and proceeded to sit on our laps.
At this point I asked just how far this was going to go, as I didn't want to spoil our relationship with the other couple. Patty indicated that she was not ready to have full blown sex with Pat but thought it might be fun to do every thing short of having intercourse. Julie and Pat agreed and with that the girls left and headed back upstairs. While they were gone Pat indicate he and Julie had been trading spouses with several other couples and he went into great detail as to what it was like to have access to other women and what a turn on it was to watch Julie having sex with another man. I told him that had been a fantasy of mine to watch Patty.