Just happened

I'm now 33 and divorced in late 2021, decided to relocate to a country town away from the city. I purchased a 22acre block with a 4brm, 1 bath house on it. Well off before and still after the divorce, as no children to support and ex-wife had her own money didn't want any alimony. I was settled in by November 2022 and in March of 2023 my sister and only sibling marriage had failed also. They had been planning to start a family, but he had a girlfriend on the side and had gotten her pregnant. So, he decided to divorce my sister and marry his girlfriend. My sister was devastated by how quick her marriage ended, having no idea of his betrayal before. My sister after everything was finalized came to stay with me to rethink her life (October 2023). Everything poked along slowly at first, nothing happened between us. Then early December on a Saturday I was thinking of going into our local town to have some fun. Then there was a thunderclap nearby as a storm cell moved thru followed by lightning then rain, heavy rain. As the rain seemed to have settled in for a longtime, I decided to stay home. After dinner with my sister, we sat together watching TV. She cuddled into me as we watched the TV, nothing unusual about that we had done it many times while growing up. But absence mindedly I had placed my hand on her breast and had started to fondle her. When I realized and removed my hand, and my sister grabbed my hand and put it back where it had been, pressing it into her breast. So, I went along with her wish and restarted fondling her breast. A little time later she started fondling my cock thru my pants and I let her continue without a fuss. She finally put her hand into my pants and started play with my now hard cock. Well, we ended up in my bed fucking and fucked again in the morning. Neither of us any precautions and if we had stopped after one night of passion maybe she wouldn't have got pregnant. But we didn't she slept with me every night since and in late January she seen the doctor, and she test positive to being pregnant. Our only fear was the baby might have something wrong with him, due to being brother and sister. No problems found and our son is very healthy, we live as man and wife and our mother (widowed) has moved to live with us. No other siblings or close relatives we mingle with a great deal. I'm quite happy with my sister/wife, albeit we aren't legally married. Our mother accepts our relationship and adores her grandson. My sister wants more children and I'm quite agreeable to helping her.