Apart from Natasha’s secret indiscretion with my brother over the next few months, the only progress towards Natasha actually seducing another guy in front of me was limited to a bit of dirty talk during sex. I had a feeling that she might be thinking I was all talk and would get jealous if it really happened, or that I might be jealously testing her to see if she was faithful to me.

I was desperate to tell her that, not only had I seen her fucking my brother, but that it had turned me on more than anything I’d ever known. I was sure she regretted what had happened with him, and over and over I debated the idea of telling her that she had nothing to feel guilty about, that I had even done my best to ensure it had happened by pretending to fall asleep.

In the end, as it had the potential to cause embarrassment within the family, I reluctantly decided it would be better for all concerned if I never let on that I know what happened.

Then, four months after my brother’s visit, something happened that would change things.

Natasha started acting distant towards me. This had been going on for a few weeks, and I was just hoping it would pass by itself. Then arriving after we’d had an uncomfortable time at a party we’d been to, I decided to address the elephant in the room and I asked her why she seemed so unhappy.

She started crying and said that she had cheated on me with a guy who had been working as a temp in her firm. I felt like my heart had been ripped out. I was sure she was going to leave me, and the humiliation and jealousy hit me like a wave. Then, she told me that she loved me more and anything and begged me to forgive her. I couldn’t believe my ears. I was so relieved.

I held her and I kissed her tear-soaked face and told her that I didn’t want to lose her and that we’d get through this. Just then I realized how turned on I was by the thought of her fucking him behind my back. 'Jesus, you’re a sick fuck,' I thought to myself.

After a couple of hours and a couple of bottles of wine had passed, and emotions had calmed down a little, I could no longer keep my horny curiosity to myself and began to ask her for some details.

She told me that he was much younger than us and that it was just a big thrill seducing him. How their flirting led to her sucking his cock at work and fucking him at her sister’s empty house. Through all of this, I was trying my best not to show how turned on I was, but I could not keep up the pretense and confessed that I was so turned on that had just cum in my pants. She looked confused, so I stood up, opened my pants and showed her my hard, cummy cock.

From that moment, she knew that I had really been serious when I had been telling her she had permission to do whatever she wanted. Needless-to-say, I pressed her for more and more details about her affair and we fucked over and over that night, but I’ve deviated from the heart of the matter for long enough, so I’ll leave it there.

To be continued in Part Three of the series…