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For anyone who has not read the first two installments of the story of a visit by my sister-in-law, let me briefly recap. Gail, my sister-in-law was having some work done at her house and came to stay with me and my wife, Sarah, for a couple weeks. One night, while getting up for a late night drink, I caught, and watched, Gail masturbating on the sofa. A few days later, after my wife went to bed, Gail and I, after playing peek-a-boo with our private areas, ended up fucking like teenagers on the living room rug. The next morning, fearing some kind of scene, Gail winked and assured me that everything was alright.....

A few days passed and my brain, along with my libido was aching for another round of fucking and sucking with Gail. But, the opportunity never seemed to materialize and I was stuck with a few flashes of her perky tits or trimmed snatch. Gail knew the effect she was having on me and seemed to enjoy the teasing. Sarah, thank god, was completely unaware of any of this. So, for three days, Gail and I flashed each other and copped a feel whenever Sarah was out of sight.

The last day of Gail's visit, Sarah and Gail decided to hang out in the back yard and get some sun while the kids played in the sprinkler. I was watching the ballgame when the women walked by in their swimsuits. Sarah in her conservative one piece and Gail in her tiny bikini. Sarah walked in front of Gail as they passed by me. Gail slowed her walk and pulled the string of her bikini bottoms to the side so I had a direct ...

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