Wife's Sister and Neighbor join in.

NB: This story contains mature themes of erotic sex, incest/taboo sex and of an adult, explicit, SEXUAL nature.

Enjoy.

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I didn't start it, I swear. I was minding my own business, sitting next to my wife's sister Marie in our backyard, beside our swimming pool. My wife Betsy was in the house, cleaning up. Marie's husband Tom was away on a business trip. It was Saturday night and we'd had Marie, her kids and a neighbor couple over for a cookout. Now, after dinner and dessert, my wife was in the house with the neighbor lady, Laurie. Laurie's husband had gone home. All...