This is a true account of something that happened while my girlfriend and I were on holiday in Nice on the Cote d`Azure last week. We had gone to the town for our usual pleasures of enjoying the sun, sea and lots of sexual activity between ourselves in a beautiful location. We are a couple that do not live together full time at the moment but have been together for 7 years. I am in my sixties but I cannot get enough of X who is 13 years my junior very sexy and good looking and constantly turns me on whenever we are together. It is no exaggeration to say we usually make love 2 - 3 times a day on holiday but are not swingers or into other people. It was therefore a big surprise when this incident happened. We had a basic daily routine of a leisurely breakfast then an hour or 2 of sun bathing on the Promenade de Anglais where X liked to sit in the sun topping up her tan while I sat under a shaded canopy some way behind her reading a newspaper as I tend to burn too easily. This had always worked brilliantly to both our satisfaction until this particular morning (last Saturday)we had just taken our places when I noticed a youngish looking guy (about mid 30`s)stop to start up a conversation with X. Within minutes he had sat down on the bench with X and began what looked like a very intense chat up of my girlfriend. In fact an arm soon went loosely behind/around her and he moved even closer which set my pulse racing in a way that was uncomfortable and reflected my jealousy. At this point I was expecting her to get up and come over to me but she didn't! In fact she seemed to be lapping up this totally unexpected attention. After what seemed like 30 minutes but was probably only 10 he suddenly looked behind him got up and left but not before kissing her on the cheek. I could not believe what I had witnessed and when X then came over to where I was sitting I was a bit miffed that she had allowed all this to happen. She told me that he was French and wanted her to go for a drink and a walk with him but had explained that I was with her sitting behind where they were hence his glance over his shoulder when finally leaving. She said she was flattered by the attention of someone she obviously found attractive and who was 20years younger. I must say I was unsettled for the rest of the day but the really interesting bit came when we went back to the room later in the afternoon. It was not unusual for us to want to fuck this time but when we started it was blindingly clear she was on heat like never before. At first my fingers were met with one soaking pussy but as I explored further with my tongue she was creaming for England! Her juices were trickling down her slit and bum in such copious amounts I was amazed and asked what had turned her on so much? All through the day and now she tried to dismiss the earlier event as nothing that had effected her but it was now crystal clear that this was being economic with the truth as I had the evidence before me. Not that I was complaining anymore because one thing I have always loved is when she gets wet but this was a tsunami. We then had one of our most mind blowing fucks ever with X and me coming in great waves. My only concern is that to this day six days on she still refuses to come clean with my and admit the guy was responsible for her being so hot. How can I progress from here when honesty is a must if we are to move to the next position? Advice would be welcome?