This story is the third story in the Arrangement (
https://www.literotica.com/s/the-arrangement-24
, 11/26/2020), and Inevitable (
https://www.literotica.com/s/inevitable-11
.) series. While I believe that it can be read as a standalone story, it probably makes more sense if you read the others in order first.
My name is Violet Curtis and I've been friends with Rose Hardy for almost forty years. We met in elementary school, went to the same high school, graduated from college the same year and were the maid of honor at each other's weddings. We worked in the same city and we settled in the same development just up the street from each other.
We raised our children together, almost as if we were one large family. I frequently entertained Rose's son, Casey, and daughter, Lori, at my house and my son, Josh, and daughter, Ivy, could frequently be found at her house.
As our kids grew up together the families bonded more tightly. We shared almost everything until one fateful weekend, after the kids had left for their first and second years at college, we shared our husbands. It was an amazingly great decision that we all endorsed. Not only were we having varied sex with varied partners, it enhanced the sexual encounters with our own husbands.
In the spring, the kids were due back from university for the summer and we realized that we would be unable to hide the expanded relationships successfully. Sooner or later, one of them was bound to figure it out. We decided to be upfront and honest about our interfamily sexual relationships.
Rose opted to break the news to her daughter, Lori, when she was the first to return from school. After the initial shock, Lori pressed for more information, like who were her parents fucking. After a little hesitation, Rose revealed that she and Jules were having sex with me and Leif Curtis.
That's when Lori dropped an explosive revelation of her own. She had grown up with Josh Curtis, shared holidays and special occasions with Josh Curtis, gone off to university with Josh Curtis and was currently fucking Josh Curtis.
Rose managed to remain calm after Lori's revelation. I'm not sure I could have done the same. Then Lori upped the ante. She revealed that her brother, Casey was fucking Josh's sister and my daughter, Ivy too.
They decided to share the information with the rest of the families. For Lori, knowing that her parents were spending time with Josh's parents presented an opportunity. It seems that the kids had a similar problem as their parents, how to continue to have sex without alerting the parents to what was happening. Having the relationships exposed solved the "what" problem but that still left the "where" and "when" problems. Lori proposed spending entire weekends during the summer with the Hardy and Curtis parents in one house and the Hardy and Curtis kids down the street in the other house.
That worked for everyone except neither Rose nor I could help but wonder what the kids were doing during the weekends. Rose had told me that Lori had shared that she wasn't having sex with her brother but somehow complemented the size of his cock. That set Rose's mind to wondering and the effect was infectious.
One summer morning, when the kids were home from school, I let myself into Rose's house hoping she had time to share coffee and time with me. Rose was sitting at her kitchen table with a mug of coffee, a piece of paper and a pencil. A balled up piece of paper was on the table in front of her. "What's happening girl friend," I greeted her.
"Good morning," Rose replied. "Just trying to fill in the blanks," she informed me.
"Blanks? What blanks?" I asked. I poured a mug of coffee for myself and sat next to her at the table.
"These blanks," said Rose and she turned the paper so I could see.
She had listed the names of two families both horizontally and vertically and created an eight by eight matrix like grid in the space below and next to the names. A row of X's ran diagonally down and across the center of the matrix.
"What's this?" I asked.
"Ever since I talked with Lori where the extent of both her's and my sexual activity between our families was revealed I've wondered how widespread it was. I tried to diagram it earlier but I got confused. This is my second attempt and, now that you're here maybe you can be helpful," she explained.
I looked at the paper. "Sixty-four boxes," I commented. "That's a lot of fucking."
"It's not that bad," said Rose. "Each possible couple fills in two boxes."
"Okay," I agreed. "What's with the row of X's?"
"That's the easy part," she said. "I've eliminated the boxes where we would interact with ourselves."
"Masturbation doesn't count?" I asked.
"Not for this analysis," she said. "If it existed at all it was before all this started and, frankly, I don't want to know."
"I giggled. "Your secret is safe with me."
"As is yours," she responded.
"Okay, what's next?" I prompted.
Rose picked up the pencil. "I thought I'd start by eliminating the connections we had before we loaned each other our husbands." She put X's in four boxes.
"And I think we can cross out two more boxes for our relationship," I suggested.
"And the relationships we have with each other's husbands," Rose added.
"That's another four boxes," I confirmed. "And four more for the kids with each other."
"You know," stated Rose, "That you and I have a relationship and it's not impossible similar relationships might occur between and among the rest of the females but what about the men?"
"You think the men might have sex with each other?" I asked.
"No I don't," she responded. "At least I don't believe either Jules or Leif might. I think it's a guy thing. They're different from us. Somehow they don't have a problem with women having sex with each other but just the thought of having sex with another man is abhorrent and I believe that it also extends to Casey and Josh."
"That knocks off another twelve boxes that we don't have to fill," I agreed. "I also believe that Lori and Ivy are in a relationship. Two more boxes. That leaves... twenty-eight combinations. What else do we know?"
"Are the kids sleeping with their siblings?" Rose asked.
"That's a safe assumption," Rose told me. "Also, what do we know about us with our own kids?
"I know that Leif and I have been busy with Ivy," I recalled.