A drive the Country

I returned home from working interstate and started to live with my grandma Fiona 61 Widow. The rest of the family have moved away interstate for work and only my mother's mother Fiona is left. Since granddad Frank passed away the previous year at the age of 68 from covid. So after my return I got a job locally and also started getting Frank's old pickup running again It didn't take that much and it was soon working great. Then at the beginning of March Fiona asked me what I had planned for my weekend off, nothing I replied. Good she said we can go for a drive to the old family cabin (no electricity) and have a picnic lunch there and check it over while we're there. Okay I answered and got up and helped Fiona get everything ready. We left about hour later and drove to the cabin and on arrival we had a quick look around and everything was fine. On entering I lit the fire and while we waited for the water to boil we looked around the cabin checking to see if anything needed fixing. After which we had our lunch and talked about the fun the family had at the cabin over the years. To my surprise Fiona said that she missed the sex she had with Frank at the cabin over the years adding that they had done everywhere in and outside the cabin. I had a big smirk on my face according to Fiona and she said could fuck better than most of the girls my age even today her age. I just nodded and then thinking I didn't believe her said she would show me. How I asked, you fuck me and I will prove I'm the best fuck you have yet had. This was a shock to me, but also a challenge I couldn't refuse and the fact I hadn't had a fuck since my return also was a factor I think. So I fucked Fiona and she really drained my balls and I really enjoyed the sex. After a rest and Fiona said we might as well head home, I asked how about another fuck before we go. She looked at me and I thought she would say no, but she said okay and we fucked again. On returning home she told me not to tell anybody about us having sex together. I agreed and while she was cleaning the dishes from lunch I started to feel her up. Your a randy young man she said and I replied your a very horny woman. After she was finished with the dishes. She we might well test her bed springs and we went to her bed fucked again. I've fucking her regularly since then and we both enjoy the sex. I still girls but nobody special as of yet. Except Fiona.