After we had our six sum we all met again, then Kim introduced us  to Jon and Joy. Jon was fully bi, but we did not tell anyone that. Joy was passive bi, she was happy to have women play with her, but she would not eat pussy. That was not a problem.

In fact nothing was a problem,  except Julia and Mike were still feeling their way through that elusive question. ‘Will something I want to do turn my partner off.’ It was kind of the problem I had.

If I had not moved in with Jack and became fond of him I would not have had the problem. When I first met Jack, I fucked him, I fucked him and his house mate, I never hid the fact he was not the only one, we went to a club.

Now, I  was careful,  when I  wanted the couple next door. I was not even suggesting that he play with men and I had asked Jon and Jerry not to play together at our get togethers. 

I did let Kim start a lesbian incident, not that she asked me, she simply took advantage of the moment. 

Julia and Mike had come around to sit in the tub with us, that led to sex so very often. 

This particular day was late September,  it was cool, so the air heater was on above us radiating heat.

The doorbell rang. 

“I'll get it.” Jack went to the front door in his bath robe.

Jack was gone a while. Mike was looking at me, the way he does when he wants his wicked way. His wife was smiling at both of us. She was looking forward to my Jack.

I could hear voices, they were in the house, the air pump was filling the tub with bubbles,  I could not hear what was said or who it was.

When Jack returned, Ruby and Carl were with him, both as naked as us.

It was the first time I had seen Carl naked, he was relaxed with a nice semi and well formed chess. He stepped in and found a space between Julia and myself. 

Jack, a gentleman as usual, offered Ruby his hand as she stepped in.

As Ruby sank into the water Mike pulled her to him and kissed her. 

I sank deep into the water and wished I was not there. Ruby knew I was a nudist,  but not that I was liberal with my affections, now Mike made a crude assault on her.

I did not know if I should protest Mike's move or hope that l could disappear down the plughole. 

She put her hand to his shoulder and pushed him away. “My little sister has gone bad.” She said, looking at me. Then she slipped her hand over his shoulder,  around his neck and pulled him to her. I was surprised and shocked, but perhaps she had hinted a few times that Carl fancied me.

To prove that Carl put his arm on the tub behind me. “Are you OK?” He asked.

He could have made a move on Julia, but I figured he wanted his wife's sister and I remembered what Ruby said about him wanking.

Jack was just sinking into the water when I turned to Carl. His cock was hard and his hands tender. 

Jack made up a couple with Julia.

My thoughts were racing about what had happened and what it meant. I knew my sister was going to be fucked by Mike and probably Jack. I knew I was going to give myself to my brother in law. I did not know what the future held now they had discovered we were swingers. ‘God, what has happened.’ I thought. 

All my worries melted away as I melted into Carl's arms. It was unplanned, but it had happened. 

Then Ruby was leading Mike to the iron dining table. She sat on it, put one foot on it and pulled Mike to her. His body blocked my view of her gaping shaved pussy, seeing my sister display like that sent another wave of embarrassment though my thoughts.

“Come with me.” I told Carl.

I grabbed a blanket as we moved away from the tub and let it fall on the lawn. I did not straighten it, I just presented myself doggy for Carl. Doggy is not my favourite position unless I am spitroasted, but it gave us both a view of Mike banging away at my sister.

By the time Jack had Julia against the tub Carl was in me.

My pussy was getting hotter,  but away from the heater I felt the cool of the night, and the breeze was delicious. Not as delicious as the cock in me or Carl's hand holding my hips.

I could see Jack trying to hold back. Mike was excited and soon came spilling into my sister, and stepping back.

Julia must have seen and knew what Jack wanted. “Go and fuck her. Put your cock in her.” She said it loud enough for everyone to hear.

I knew Julia had cum, but Jack still had a hard cock. He took a few steps to Ruby. Ruby moved, laid on the table.  I thought I saw cum, but Mark was soon in her and all I  could see was his bum thrusting into her.

Jack stepped back and knelt licking at Ruby just before Carl filled me.

We gave Ruby and Carl spare robes, took a break, then got the topper out and spread in front of the sofa.

When we were alone I asked Jack what was said before they came out to the tub.

“I said we were in the tub and I would get you. They asked if they could join us. I told them we were nude, and they said OK.”

“What did you say about sex?” I asked.

“Nothing, that was all down to Mike.”

“And now you have had sisters, did you enjoy that?”

“Sisters? Is that special?”

“Some men think so, we must do more.”

“More sisters?”

“More things.” I said. I wondered what he would enjoy.