Replacing my Father

Long story short, my parents can't divorce because they would lose everything as per my late grandfather's wills. My father Albert 48 would lose everything if he divorced my mother Nancy 45. Their marriage was arranged by my grandfathers as a way of bringing 2 family companies together. But they also took the precaution of the clause in their wills which stated if they divorce each other they lose everything. Trapped is how Albert defines it and I haven't heard what Nancy thinks as she has always being a quiet person by nature. They only managed one child me Reginald 25 prefer to be called Reg, I'm a bit more like Nancy than Albert. I'm usually quiet unless I have something to say, but I do like doing things with hands and being outdoors riding horses or trekking. Not so hot when it comes to dating those. No success there as yet, I'm lucky as I have a trust fund also setup by my grandfathers. Which gives me freedom to do want I want, Albert and Nancy have come to an agreement in sense. As long as the other doesn't shame the other, they can do whatever they want. That way Albert chases women and has affairs, Nancy wasn't as far I knew chasing men or women. She prefers to stay at the country home living quietly like a nun. No lovers until March 2021, she got sick with a fever and I was worried that she might die. Albert never once visited her and stayed in the city apartment as was usual for him. Nancy never goes there and I have to ring ahead if I'm to visit. Anyway Nancy recovered and I noticed a slight change in her, nothing I could put my finger on. In April I was going trekking for 6 days and to my surprise Nancy asked to tag along. I agreed, but a bit shocked at her sudden interest in hiking, I'd everything I needed including a 2man tent. Nancy didn't have anything, so I took her shopping for boots, proper clothing and a sleeping bag. Plus odds and ends, I drove to the start of the trail and booked our trek with the local rangers allowing 7 days as Nancy wasn't use to hiking. We set off, with the intent to travel 12 miles the first day. It was slower than I hoped, but only because Nancy kept stopping to take photos. She was able to keep with me no trouble. We camped the first night and set off again early the next morning. Again stopping for photos, but we make camp almost on my planned arrival time. Nancy had picked up the pace as they say, I wasn't going my normal pace. Because I was allowing for Nancy, after we had dinner we talked. Nancy asked could we join our sleeping bags together as she felt cold in hers by herself, saying she must be missing the central heating at home. I greed and zipped them together, a little later we laying together. I dozed off and awoke a later to Nancy cuddling up to me and I went back to sleep again. The next day similar to the previous making good time even with photo taking. I again joined the sleeping bags and we slept together again, I awoke just after midnight. I needed to pee, I got up and went outside and peed. When I got back Nancy was awake and asked where I had been. I said call of nature, she replied do you always answer the call of nature. I said yes I don't like a wet sleeping bag, I got back in the bag and was just getting to sleep again. When Nancy woke me saying I have a call of nature. I said just go outside and you'll be right, I can't go alone she replied. So I got up and went with her, she didn't put her PJ's bottoms back on when was finished. I asked why and she said I wet them and we both back into the bags together. I was intending to go to sleep again, but she wanted to talk. So I talked with her and she then asked me would I do her a great favor. I said anything you want, what is it, fuck me was her reply. I was shocked and said the usual stuff I'm your son and you could have any man you want. She replied I want you and you alone, she also took hold my cock at the same time. Nancy is usually a quiet person, when she makes up her mind it's made up and I known that all my life. Besides a fuck is a fuck and I couldn't say I wasn't interested as my cock was as hard as a rock in her hand. So we fucked and fucked again the morning, we were late getting to our next campsite. Not due to photos but a very horny mother, wanting more sex. It took the full 7 days to finish our trek and on arriving home I went to have a long hot shower. Nancy joined me in the shower and in my bed that night and regularly since. I think the fever must have awaken her sexual desires and she has a few years of no sex to catch on. I'm enjoying while it lasts, Nancy has also gotten our housekeeper into bed with us. Daniela 50 widow is a great fuck and has kept me satisfied when Nancy when away to visit an old friend for 3 days. She came back extra horny. We are going trekking again at cabin I've bought and I expect not to leave its bed much at all. Daniela is also coming as I really like 2 naked women licking and sucking each other while I'm fucking one of them.