My ex-wife's sister was a few years younger than her. At the time back in 1997 she was 31. She has the hottest body and I masterbated many times thinking about her. Her husband and her are a very straight laced couple, You know, great careers, two great kids, nice house in the burbs.
Well my wife and I were there for thanksgiving in 1997. As a matter of fact her whole family was there. Well during dinner I had to use the bathroom. The bathroom on the first floor was being used so my sister-in-law told me to go upstairs and use the one there. So I went up and I could have used the one in the hall, instead I went into the master bedroom and used hers. I got an instant hard on as soon as I locked the door and saw the hamper there.
When I opened it I almost passed out, lying right on top was a black thong. When I picked it up I was shaking. I raised it to my nose and she must have just taken them off because the smell was intense. I pulled out my cock and began to stroke. I shot the largest load right on the sink and mirror. I wiped the cum off my cock with the crotch of the panties and put them right back in the same position as I found them. When I went back down it was hard to look at her in the same way. Her sister and I are divorced now and I only get to see her maybe a few times a year but I hope I need to use the bathroom next time I'm there.