Note: This is a story that I lived through. Some names have been changed, some have not. I tried not to embellish.
If well received, I'll convert more of my diary entries from that time to story format for your enjoyment.
Many thanks to sr71plt and hfernandez1983 for proofreading the story and for providing advice.
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This story requires a bit of background. When first I met my future wife, I was a bit old fashioned. I believed that you met someone, fell in love, maybe got married, broke up and then found a new love. Wendy delighted in being "different". We had only dated for a month when she jumped from step 2 directly to step 5 (find another lover) . I found out that she was seeing an old boyfriend when he called one day and I answered the phone. When I said that I was her boyfriend, he got pissed off. Can you imagine? HE was jealous of ME! When I confronted Wendy, she explained that it was all innocent because he had told her that he "needed her" and that they just sat and talked in his car while I was at work, and only made out and groped each other. Only?
To say I was mad is to understate things. I'd always thought that kissing was one of the most intimate acts between a man and his woman, and here she was kissing another guy like it was nothing. It was not something I would take sitting down. The next day I took an evening off work and followed her to their clandestine meeting place about a block from his mom's house. I parked in the dark a hundred feet or so from his car to catch them in the act. They were silhouetted by the street light as she slid into the seat beside him. They leaned into each other, and anyone could clearly see that bastard kissing her. A few minutes later I could see that she pulled her blouse over her head. She shook her hair so that it fell down her back again. I knew that if her blouse was off, then her bra would soon follow. Yep, there was that little shoulder wiggle she did to cause the bra straps to fall from her shoulders. His head disappeared. He was sucking her nipples! I could not believe that I was sitting there watching my girlfriend being groped and fondled by this guy. You can imagine my shock when he sat up and HER head disappeared from view. There's only one thing that you do in that position, and that's sucking cock. She was sucking him with the lips I'd kissed just hours before.
I was so blind with rage that I wanted to confront him and beat him to death. Hitting the gas, my car roared down the road, skidding to a stop just behind his car. The plan changed when he got out of his car and I got my first good look at him. He was about 5 inches taller than I, and a good 50 pounds heavier. I did the smart thing and tried to run him over instead. I did not miss him by much as my fender crumpled when it bent his door backwards. I paused long enough to pull Wendy into my car and sped off before Mark had a chance to react. I guess that Wendy was so impressed by my chivalrous action that she professed her never ending love and pledged to never cheat on me again. She swore that she'd only gone down on him once. That was probably untrue, but I took her back anyway. I was probably persuaded by the way she looked up from my lap as she begged me to forgive her. We had wonderful sex for months and months after that. All was good in my world.
Six short months later she broke that pledge. I found out from a friend that she was sleeping with my best friend Rick, and again she was doing it while I was working. Just like before, I followed her to a meeting with her lover. Again, I watched from the shadows (through the window this time) as they kissed in his living room. I watched as she danced for him, taking off one piece of clothing at a time till she was swaying and rubbing against him in the nude. She pushed Rick back on the couch and took her time undressing him too, and then she sat on his lap. He sucked her tits as she moved up and down. I decided that since she was no longer going to be my girlfriend, I'd see how far they went.
They were disgusting! It was obvious that he was going to be fucking her. But first they kissed. He kissed her passionately all over her body. I rubbed my hard-on through my jeans. Yes, I was excited; After all, the most beautiful woman in the world was performing a porno scene like I'd never seen. I could see his cock as it entered her. I heard her telling him how big he was. I saw his big hands on her ass as he guided her up and down. She rode his cock much longer than she'd ever ridden mine. Fascinated, I watched till they were done, then I righteously burst in on them and read them the riot act. Voices were raised high enough that the neighbors heard the whole thing. No blows were thrown, but when I left he was looking miserable and she was in tears.