When I moved to the Boston area, I started riding the hour or so trip by train to work. After a few months I met a woman, Julia, who also commuted by train, and we struck up a relationship. She was a professor at a college in the city, and she was beautiful in just about every physical attribute imaginable. I Iater learned that she was in the middle of a messy protracted divorce and had been sex-starved for some time. Eventually we started seeing each other, having dinner, traveling, and ultimately having a long and very healthy sexual relationship. She had two children by her marriage and managed to maintain a spectacular body. Her figure was near perfect for the 'girl next door' type, bobbed brunette hair, and she always caught the eye of onlookers wherever we went. I loved taking her to the beach just to watch just about every guy there be unable to resist staring at her body.
During this time when Julia and I were dating, my neighbor Mark in the upstairs apartment had developed a huge crush on her. Although never a student of hers, he did attend the same college as a full-time student. He said she was undoubtedly the sexiest prof on campus. He often watched the movements of her body as she came and went on campus, as we occasional met in restaurants, and at times would hide out in the hallway of our building so he could hear her as we had sex. She was often very loud and always loved long sex sessions, especially with blindfolds and light bondage. Mark was a good-looking guy with an athletic body, and never missing a good-looking female. I often wondered if Julia ever noticed him as well. At one point I did catch that fleeting moment when she referred to him as a 'hunk'. After a while I shared with him some pictures and videos Julia and I having sex that I had made. Mostly these were of her undressing for me, candid shots of completely naked, or videos of the two of us having sex. Often the videos were from a hidden camera that I would later share with Julia. She loved them and we often used them as preludes to sex. These drove Mark absolutely crazy, especially pictures of her receiving oral sex or when she was clearly having an orgasm. He adored her body and our conversations got very intimate, especially when it came to how she enjoyed being 'pleased'. I shared pretty much everything about her with him.
There were many intimate moments between Julia and I where I shared with her my arousal at the thought of another man making love to her. I convinced her that her body was so desirable that any man would love to have her if only for a short time. She was embarrassed, always coy, and would only say that it would be fine as long as she 'didn't know about it'. It became our sexy little joke, but I was completely aroused at the fact that she was being as cooperative as she could be. For a while we dropped the conversation, but it never left my mind.