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My wife had a grudge against my sister 30 years ago. To get even with her, she asked me if she could fuck him. It surprised me and I asked why. Seems that back in high school, my sister took away a boy my wife really liked and she never forgave her for it. To get even, she would fuck her husband. Rita and I had gotten together with a friend of mine a couple of times for a threesome so I didn't have a problem with her screwing the brother-in-law. She wanted it to be with just him and not me present. I agreed.

She set it up with him. He was to arrive at our home one morning. She had on a sheer night gown and looked very sexy the morning I left for work. She gave me a big kiss and said she would call me at work when he left. The morning went very slow. Finally she called around noon. I left for lunch and made it home. She was asleep in our bed. The covers all messed up. After waking up, she told me the details.

He had arrived around 8 and didn't leave till 12. He gave her a fucking to remember. I had to get back to work and kept a hard on all afternoon. Very hard to hide. That night we fucked like never before. It was great.

Then came the shocker. She said she wanted it to become a regular thing for her. At least once a week. We talked and I agreed. For the next month, he came over in the morning and they fucked till lunch time. At night she and I would have great sex.

Then came the shocker. She asked me one night what I thought about him getting her pregnant. I had to think about it a lot but finally gave in to lust. It would be wild knowing my wife was pregnant with another man. I just couldn't describe it.

She quit her pills and for the next month, she had sex with him 2 times a week. She even told him she quit her pills. It only made him more horny for her. 2 months later, she was pregnant. He still thinks I don't know about it. We had a great time letting him make a baby.