Doubtless you have already read the first 3 parts of our tale, but perhaps you might like to catch up on how we reached the stage we were at when the pandemic broke. My gorgeous wife, Tina, had started to enjoy sex with younger men, and I had started to enjoy watching her in the throws of her pleasure. I don't think either of us thought of me as a cuckold, if you had asked me, I would have said I was a wife-sharer.

My work colleague, Andrew, had moved his family down from Scotland in early-2020, after he had completed his 'probation' with the company, and we had got to meet his wife and children. Part of the reason for seeking work down this way was that his wife, Sally's parents live about 30 miles from us. The birth of their 3rd child had been a difficult affair, and they wanted to be closer to their support.

As the restrictions of the pandemic eased, Tina and I got to meet Sally and the children, and we got on well. It reminded us of how our family life was 20-odd years ago. Most Saturday mornings, Andrew would take the children off to the park or an indoor soft-play centre for a few hours, to give Sally some 'me time', and I would occasionally join him as it gave us the chance of a coffee and a social catch-up.

Sally started to come over to our place on Saturday mornings to spend some time with Tina, she said it was nice to have some adult company after a week when her whole time had revolved around the children, schools etc. We already knew that Andrew had told Sally about his 'assignations' with us so, although it had not been explicitly mentioned, there were never any awkward moments.

One weekend when Sally had spent Saturday morning at our place, Tina seemed a bit pensive when I got home. We have always been very open and honest with each other, so I decided to let her tell me when she was ready, but I was slightly concerned that she might have fallen out with Sally over something or other.

When we went to bed that night, Tina said that Sally had started to talk about Andrew's time spent with us. He had already told her about everything from his perspective, but she wanted to hear how Tina had felt about it. Tina said that talking about what she had done with Andrew and I started to make her feel aroused, and it was clear that Sally was feeling the same. Tina said she started to rub her own nipples over the top of her clothes, which quickly set off Sally doing the same. I started to wonder whether Sally would ever need a bra, as she has such small tits, but I was quickly brought back to the here and now as my wife had started to stroke my cock under the covers.

Tina said that they had been sitting either end of the sofa, but Sally slid across, saying that Tina has the most gorgeous tits, and she wanted to feel them. Tina said she had simply smiled, and Sally took this as an invitation as she reached across to stroke my wife's tits. Tina said it felt natural to do the same to Sally, they were both looking into each other's eyes and they seemed mesmerised by each other. Their lips met, initially very gently, but it quickly became a full-on snog.

Tina's gentle stroking of my cock under the covers had me rock hard by now, and she pushed the duvet down to go down on me as she continued to tell me how they had gone upstairs, stripping each other naked, so they could explore each other's bodies properly. I think Tina realised she had me where she wanted me, reminding me that this had all taken place in the same bed where we were enjoying each other. With a big smile on her face Tina climbed up astride me and slowly lowered herself onto my rampant cock.

Although I had barely touched my wife, she was clearly very aroused from telling me her tale, as my cock slid in to her very wet pussy with such ease. I tried to delay my eruption, as I knew there was much more of the tale to hear, but Tina wanted me now, and she started to demand what she wanted. When she started to orgasm, I couldn't hold back any more and I flooded my lovely wife's gorgeous pussy with copious amounts of my seed. As we recovered our composure, my mind returned to the thought of Tina and Sally in this very bed just a few hours earlier.

When we awoke on the Sunday morning, Tina was still feeling horny, and she had little problem raising my interest by telling me some more 'juicy bits' of her romp with Sally the previous morning.

During the course of the following week, Tina started talking to Sally on the phone during the evening. The first conversation lasted for over an hour, so I guessed it was more than a simple social catch-up. Tina would take her phone upstairs to talk to Sally, but would tell me a little of what had been said after the conversation. It would seem that neither of them would admit to being bi (Sally did confess to a brief flirtation with another girl while she was at uni more than a decade ago), but they both thought it was just something that happened, without any explanation of why.

I had a pint with Andrew the following Friday evening, and it was clear Sally had told him all about the previous weekend. He said he thought our wives were planning something, although he was not sure when they could make it happen. He said their sex life was still enjoyed very quietly, late at night when the children were asleep which reminded me of when our kids were small.