My wife and I have sex about twice a week, which my wife is happy with, but I would like it a little more often. So as not to pester her I normally masturbate two or three times a week. We work different shifts so I normally have a couple of hours to myself each day.
One day I got home about two in the afternoon, my wife was not due home till about six. I went into the bedroom and got undressed, I decided it would be nice to have a wank in the living room watching the TV. I got a dirty towel out of the washing basket ready to take with me to clean up my mess afterwards. Just on impulse I wandered into the spare room and started looking around. My wife's sister was staying with us after recently breaking up from her husband. I found a pair of her panties on her bed, they were small and very silky and I rubbed them against my balls, it felt really nice so I decided to take them with me to the living room. I thought I would be okay as my wife's sister usually came in about seven in the evening.
I switched the TV on and found a channel with females on and starting rubbing my penis up and down, just nice and gentle, I wanted it to last a while. I then wrapped the panties round my shaft and that felt really good. I was now going off into a world of my own, heaven was calling ermmmm! Just then the door opened and in walked my wife's sister. There I was stark naked with a towel next to me sat on the sofa with her panties wrapped around my cock. Ooooooooops. She just said 'Hi' and smiled then said she was going into the kitchen to make a coffee and asked if I fancied one. I spluttered 'Yes please'. She said 'Okay, it will be ready by the time you've finished what you are doing, oh and don't forget to put my panties in the linen basket when you have finished with them'.
I tried to carry on but it seemed difficult. Five minutes later she came back in with the coffee and said 'Are you still at it', and sat in a chair opposite me and started drinking her coffee and reading a magazine. Now I was getting turned on and started to rub my cock faster and play with my balls. She looked up and smiled and said 'I think this might help you'. She opened her legs showing she had no panties on at all, all I could see was a lovely hairy cunt. She then just told me to go for it and I did. I groaned and moaned and I came all over the place and soaked her panties. She just asked if I felt better now that I had had a wank. I just whispered 'Yes thanks'. She replied 'Well you just better get yourself cleaned up and drink your coffee before it gets cold'. I did just as she told me. We never spoke about the incident again. About two weeks later she moved into her own flat. A few days after that an envelope arrived and inside were the panties I had used to have a wank. Enclosed was a note saying, have one on me anytime, but don't let the wife catch you! She hasn't.....yet.