My Sister Joan

I'm George 44 divorced with 2 grown children, married at 17 due to wife pregnant with first child. We stayed together for 20 years, we parted on good terms. I only have 1 sibling Joan 39 who is very shy and lived with our mother Harriet till she passed last year due to covid. Our father departed for parts unknown years before and has never tried to contact us since. With Harriet's passing, it was up to me to look after Joan. I've my own 3 bedroom home just a mile outside our town. It's 6 acres lets me have horses, chickens, and a dog. Joan and I always got on fairly well and so there were no problems when she moved in. I work 6 days a week and gone by 7 every morning and back about 5 in the afternoon. Sundays I work around my place and go riding, Joan also loves riding. So we started going out riding together, ending up at the river for a swim before returning home. Joan made it easier for me, as she fed the animals in the morning and I got an extra hour of sleep before going to work. Then I took some leave and dug a pond and lined it with rocks. While on leave I was with Joan a lot more and started getting interested in her sexually. Then a big thunderstorm happened and Joan who was always afraid of storms stayed close to me. We were in the barn closing up as the storm approached and we had to stay in the barn till it passed over. With Joan clinging to me, I got aroused and made a move on her, and she was shocked a little at first. But she didn't try to stop me and I proceeded to kiss and feeling her up. By the time the storm had passed, I had a hand in her panties and her bra off. We returned to the house and I took her to my bed. There I fucked her and have been fucking her ever since Joan got pregnant and we're expecting a boy in May, all show the baby is fine.