My wife Fiona has always enjoyed extra marital sex with my permission. I have always been turned on by Fiona enjoying herself and then telling me all about it. This is the longest she has been seeing a guy and the most riskiest as Duncan is the brother of a friend who knows both of us and how happily married we are. We discussed the risk as we would never want anyone to know I’m in on it especially as it has developed and Duncan has feelings for Fiona. In a strange way Fiona does have feelings for Duncan but not in a way to replace what we have but really enjoys the excitement of the going out and does enjoy the sex. Fiona is a very attractive 47 year old and Duncan is 32 and they met at a Xmas party last year which started with a dance and he has been seeing her regular ever since. I’ve not posted for a while as we had 6 weeks in Australia and New Zealand over the summer which I think was difficult for Duncan but prior to that he took Fiona to Paris for the weekend which sh3 loved and on her return said she had never had as much sex in a 72 hour period before in her life even when we were at our best. On our return Duncan announced he had been invited to a wedding in Leeds and would Fiona join him. We started out having extra sexual fun with guys but not actually seeking an affair but with Duncan this is exactly what has developed. We discussed it and rather than cool it off and need to find another hot fuck decided we would go with it so Fiona made out I was away on business and could get away for the weekend. When Fiona I meeting I took to wearing a chastity belt but for a weekend it was torture as I discovered earlier this year, it was to stop me shooting my load when Fiona had a meet arranged and then losing interest and wanting to call our fun off. We agreed we would have our final sex session on the Wednesday night as she was setting off with Duncan on the Friday morning. On the Wednesday evening we went out for a meal and Fiona decided to wear a leather skirt that her and Duncan had chosen , he likes Fiona in leather skirts and trousers whereas I like nice soft touch material on Fiona however this was a teasing night and Fiona making out she was thinking a lot of her weekend ahead with Duncan. Fiona wore a nice white satin blouse with the skirt and had black holdups on with crotchless panties and looked amazing. We went to our usual Italian restaurant and all night our discussion was around our sexual fun. We both had several glasses of wine and ended up quite tipsy. The sex was amazing when we got home. As soon as we got in to the house we started kissing and I unbuttoned Fiona’s blouse and as she was wearing her front fastening bra I was able to access in to her nipples very quickly and loved fondling her lovely nipples knowing Fiona was thinking of her time ahead with Duncan. We then made our way on to the sofa and I stripped completely to allow Fiona to start licking and sucking my now very erect cock. Fiona teased how it was not quite as big as Duncan’s but would do for now........ When I could take no more I motioned Fiona to straddle me lifting her leather mini skirt and guiding my cock in to her crotchless panties and in to her gushing wet pussy. We were riding for ages and Fiona whispered not to cum over her skirt as she was wearing that to meet Duncan on Friday. I couldn’t last any longer and started to urge Fiona to cum to bring both of us to orgasm and how wonderful it was. Fiona removed her cum covered skirt and tutted she was wearing that for Duncan on Friday.