After I had taken myself to the spare room and eventually fallen asleep I woke in the early hours of the morning. I was not aware why I had suddenly woke up but I had an erect penis like I had never had before, it ached and I didn’t know why. I lay onto my back and started to rub myself. This has not happened since I was a teenager and has never happened since. The strange thing was I couldn’t get the picture of my partner out of my mind when I was rubbing myself. I pictured her in the front seat of a car, her skirt pulled up, her legs wide open and another man seeing her and feeling her between her legs and making her cum. I pictured her rubbing his swollen erect penis and making him come. I reached down for the cloths on the floor and caught the cum that ejected from my penis. I had already come twice that evening and I could not believe the amount I came again. I cleaned my self up and fell back to sleep. The morning came and I awoke thinking it all had been a bad dream the previous evening events. I went downstairs and put some coffee on. My partner came down shortly afterwards and tried to make conversation. I was having none of it and didn’t engage in conversation with her what so ever. I was still shocked by the previous evening’s revelations. This was how it remained for the next few days, the only difference being I could not get the picture of her being fingered by another man out of my mind. I would go to work and at random times the image would return into my head. On one occasion I was in the toilets, I noticed the cubicles were all empty and I went into one. I quickly pulled my trousers and pants down and started to rub myself, I put it down to having no sex for the last couple of days but it was the image in my mind of my partner being fingered by another man that made me exited. I have never masturbated at work, banks are very boring places, but here I was doing it now to an image I should of found disturbing and I was initially shocked by. As I rubbed myself I pictured my partner rubbing this other mans cock, I got so turned on I raised myself off the toilet slightly and I thrust my hips in time with me rubbing my penis, I was totally out of control. I came and three large spurts of come spurted from my penis and landed onto the door of the toilet. What was I doing I asked myself. I tidied myself up, and the toilet door, and left, if someone had walked in whilst I was doing that they probably would of heard me, why am I so turned on by these new images? Over the next couple of days I carried on with the cold shoulder routine with my partner, she attempted to talk but again I didn’t engage and I carried on sleeping in the spare room. It was this way for the best part of a week. I had been masturbating several times to the images that kept reoccurring in my head. I eventually tried to put some sort of reasoning to the whole situation. I decided we either moved on or we where going to separate. I still loved her and I didn’t want to loose what I had. That evening I started talks with her and attempted to sort thing out. She was very apologetic again, assured me that this would not happen again, it was a one off and since it had all blown up she had kept her distance from him. She said it was me she loved and didn’t want to loose what we had. I kissed and held her, it was all over as far as I was concerned. I did however keep having these nagging thoughts about her at the hands of another man; they were not thoughts of anger but of curiosity. I put this down to the healing process and attempted to resume back to normal. That evening I didn’t sleep in the spare room, I did however masturbate an hour before we went to bed, I thought we might sleep together and have sex and I didn’t want to come too soon, I wanted to explore the thoughts I had been having further. I climbed into bed with my partner and I held her close, we kissed and I ran my hands over her body, she responded and ran her hands over mine. I moved my hand down to her pubic area and she responded by opening her legs, I could not get the image of another man putting his hand where mine was now out of my head, it was making me turned on, I wanted to press the moment and bring it out into the open. I knelt next to her as she lay there, I kept my hands working between her legs and she kept hers on my penis. I worked out how best to approach my next question. I asked her, will you wear your bedroom panties for me, she looked at me and said of course, she stood up and went to the draw she keeps all her underwear in, she picked out a pair I have seen her in several times before, these were not the ones I wanted to see her in. I asked her, will you wear the ones you wore when you were with him? She looked at me at started to protest that she thought it was all over and we were ok with things. I reassured her it was not me being funny only I was curious at to what she wore on that occasion. She hesitated but then picked them out, I recognised them as the ones I had pulled out of the washing basket, sniffed and masturbated over. She slipped them on; she looked a little bit awkward and returned to the bed. I kissed her and played with her nipples for a bit, they were not as erect as normal. I knelt by her again and looked at her laying there, legs open and her skimpy panties hardly hiding anything that was between her legs. I pictured him seeing what I was seeing now and his penis getting as hard as mine was now, she started to rub me slowly. I placed my hand between her legs and pushed her legs open. I played with her through her panties. It was all getting too much; I just wanted to scream out what I was feeling. I said, so this is what he would have seen when you were in his car. She stopped rubbing me and looked at me, now was not the time for me to back track, I was feeling emotions like never before, I motioned for her hand to carry on rubbing my penis, she did and she started to get the idea that I was actually turned on at this point. She carried on rubbing me, opened her legs a little further and said, yes, he would of seen exactly what you are seeing now. I wanted to come there and then hearing those words from her, I had masturbated earlier otherwise I would of come there and then. I said I can see all your lips and fanny through these panties, they hid nothing. She carried on rubbing me and I pushed the questioning on further. I bet he wanted to fuck you also, to put his hard cock into you and fuck you until you both came. She never replied, she knew I was venting my sexual curiosity and it was a welcome relief compared to how I could have been. I could stand it no more, I slipped my hands inside her panties and rubbed her clit, she was wet and was enjoying the exiting and new bedroom routine as much as I was. I placed my other hand onto her breast and felt her now hard nipple, I roughly rubbed her tits whilst I watched my other hand moving between her legs inside her panties. I wanted to say so much to her at this point but was unsure if I would drive her over the edge if I did. She was enjoying the moment immensely and rubbed my very erect and hard penis and lay with her eyes closed. I continued, are you picturing him now, fingering you in his car and you rubbing his cock like you are mine, she uttered the words yes. It was too much and I had to fuck her, I moved myself in-between her legs, pulled her panties to the side and pushed my hard penis into her now very wet fanny. I must of only been in her for a few strokes before I came, it was so strong and I felt the chemicals rush through my body as I did, it felt like I was a young man again making love for the first time ever. I felt my breathing and heart slowing and I literally collapsed onto the bed bedside her, my mind racing and trying to work out where to go from here. My partner was the first to break the awkward silence between us. She cuddled me and kissed me on the cheek, that was exiting and new she said. I knew exactly what she meant and didn’t want to dismiss what had just happened between us. A whole new avenue of thoughts and feelings and just been opened up to us. I said, I can’t say I am not upset about what you did, however, I don’t know why but I cant stop thinking about the two of you together. I gives me pleasure to think you are getting sexual excitement and gratification at the hands of another man. She never said anything, she kissed me and we went to sleep. The following days normality resumed into our household, my partner stopped wearing her bedroom panties to work and we reverted back to how we were before all this began. It was like it never had happened and this chapter was closed in our relationship. What had not changed was the fact I was still masturbating to the images of her and him together, I could not stop this and no matter what I did these images would not stop. I was not sure I wanted them to stop.