Step Mom

This is a true account of an experience that I had some years ago.
I promise you it's all true and an amazing time.
My parents were divorced and I lost contact with my father, I cannot recollect why I needed to but I decided I wanted to reconnect with him.
Believe it or not I actually used one of those witchcraft boards with the alphabet and numbers around the edge (don't know how to spell it) and asked it where he was. It gave me the name of a village not far from the town we lived in, so I wrote him a letter, sealed it then a covering letter to the local constable of that village and posted it.
A few weeks later I got a reply from my father and we met up, regrettably he was suffering from advanced stages of spinal cancer and didn't have long left.
I went to see him and his new wife Sheila, it was pretty emotional but so rewarding in so many ways.
After several visits when we were more relaxed and getting comfortable with each other, he joked that the thing she missed most was sex as he no longer could apart from oral, so jokingly said "well let me know and I'll step in" and that's where it all started.
She was a wonderful fuck, just wanted more and more, always in the same room so dad could watch and enjoy. This continued until and after he died. We then tried a bit of swapping but she was never happy with that as the other blokes didn't seem to satisfy her properly. I suspect it was the inferred "i****t" part, although she was never related to me by blood.
On one occasion when I went to visit there was a young stranger lass with her, I thought she'd decided to try lesbian fun but it turned out to be her daughter from Willmington America.
It ended up in bed as a threesome on several times while she was over, and then went back to "boring" husband in USA, during one phone call with her she told me she was pregnant, and it was mine, Wow what a feeling that was.
Sheila has since met another nice guy, remarried and I backed off, but it has always been an amazing period in my life I'll always cherish.