When I was in my early 20's my brother in law and I use to get together and have a J/O Session. We would have a few drinks and then watch some porno and at a certain point start to masturbate and cum. Once in a while we would make it a mutual session.
One weekend we were spending the night together, our wives were staying at the other house. Sort of like a guys and ladies night out. Bill and I had some beers, watched some porno and knew that shortly we would be masturbating. I had used my wifes satin panties and slips many times before to JO, but Bill and I never had used them. This night was perfect for it. I went into her drawer and pulled out about 5 satin slips and a few pairs of panties. Bill asked me 'What are you doing with those'? I told him that I used them to masturbate and he said that he never used them because his wife wore cotton.
We began using the panties and slips, passinig them back and forth while watching the movie. I took one of the slips and leaned over and grabbed his rock hard member and wrapped it in satin. I worked his member for about 5 minutes and he announced that he was going to cum. I kept the slip on there and kept jerking until he was done. I looked at the slip and saw one giant cum stain. We managed to mess up a few slips and panties that night, and even put some of them on at one point which was a lot of fun.