Half Sister

My father was an asshole and played up on my mother repeatedly and during one of his affairs he got the woman pregnant. She had a daughter, and I was about 6 at the time and of course my father returned to mother, and she took him back as usual. He returned because she had the all the money and he had nothing much himself. Which was used to support his now ex-lover and his daughter, my father was very good for another few years. But then returned to his old ways but took care not to repeat the same mistake again. He had the snip so he couldn't make any more babies, my mother had a great deal of trouble having me and couldn't have any more children as a result. So, that how things were till I turned 22 and my father then died heart attack. My mother kept up the support of my half-sister and that was how it was till I finished university. My half-sister was starting university and her mother died in a car accident. My mother had my half-sister move in with us and we lived together with my half-sister attending the local university and I got a good job locally. We had always known each other as my mother didn't blame my half-sister or her mother and it was her made sure my father done the right thing. My mother health wasn't really good for a long time and then Covid came, and it took her. Leaving me and my half-sister alone together, she was in her last year, and it caused her to finish it later than normally she would have finished it. I took her to some work-related dinners and people saw us together and thought she was my girlfriend. I didn't do very well at dating and so was unlike my father. But my half-sister and I got on very well and at the last party (Halloween) we attended together we ended up sleeping together and have continued ever since. It just feels right for us to be together.