Wife's Sister and Husband

My wife has a sister that is two years younger than her. This sister started dating her future husband in high school and they only had sex with each other, both being virgins their first times. Conversely, my wife and I each had several sexual partners while we were in college, neither of us being virgins our first time.
We all got married the same year, and now it is 30 years later. We were driving to Florida and stopped to visit them on the way. After some beers for the guys and wine for the sisters, the subject of sex partners came up. My wife's sister said that she and her husband only had sex with each other and asked my wife about us. My wife told the truth and said that both of us had four partners before we got together. My wife's sister said that she wished that she had other partners before her husband. Her husband said the same thing. Then the sisters went to put the glasses in the dishwasher and my wife and I went to the guest room and they went to their bedroom. A few minutes later, there was a knock at the door and my BIL said that he had something to ask us. He came in and said that his wife had sent him to ask us if we wanted to come to their room and join them for sex.
When we went to their room, my SIL patted the bed beside her, and I got in with her. My wife and BIL got in on the other side of the king size bed. My BIL started kissing my wife and I kissed his. Soon he was on top of my wife and he started fucking her. I got on top of my SIL and she guided my cock into her very wet cunt. We heard them cum and then we came shortly after. We slept together and in the morning we fucked again. We stayed for two days as planned and I fucked my SIL five times and my wife and BIL did the same.
We invited them to join us on vacation since we had rented a two room house on the coast for a month. They came down a week later and we switched spouses as soon as they arrived and went to the bedrooms and fucked. They stayed with us for two weeks and we fucked the other's spouse the whole time and actually didn't fuck our own. It was the first of several fun vacations with them.

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