My changed mother

My parents divorced, my mother 52 got the house and me 22 the third child. The useless one according to my father, as I didn't go to college. After the divorce my mother started drinking a lot, I would come home find her drunk. Last Christmas we were alone mostly, and my mother drank quite a lot. On day after Christmas, I found her passed out in the afternoon. Still her PJ's so she had gotten up and just started drinking, I myself had a few, while out and was a bit horny on my return. I had intended to watch porn and get myself off. But as I took my mother to her bed, feeling her body, I got aroused and decided to fuck her instead. She was out to it and would never know, was my reasoning. I did as I wanted with her and cleaned her up afterwards. The next day she was sober for once, I was surprised to find her that way. First, I thought she had run out of booze, but there was one-half full bottle visible on the sideboard. I said hello and she said hello back, then she added she felt strange. I asked how and she said somehow, I feel satisfied. Why's that I asked, no idea was her response, but it didn't last. She was back drinking again just two days after. Thinking it was me fucking her that had made her feel satisfied, I fucked her again when she was drunk and out to it. Again, she stopped drinking, it lasted a couple days again. Finally believing it was my fucking of her that got her satisfied. I fucked again and same reaction afterwards, the next time she wasn't out to it when I got home. But was very drunk, I decided to fuck her anyway and she didn't put up much resistance. Except saying I'm your mother; I actually fucked her twice and stayed the whole night with her and showering with her in the morning. Later on, I bedded her again, she was sobered up by that time and willing to fuck with me. Since then, I sleep with her and regularly fuck her. She hasn't drunk much alcohol at all since, has a couple if we've visitors otherwise none at all. Always quite willing for sex with me.