My mom crossed a line with me a long time ago, we had sex when I was quite young. We actually kept on fucking for a long time, but eventually, I wanted a normal relationship. I wasn't ashamed of my incest sex with mom but I wanted something I could tell other people about. So I broke up with my mom, and later I found someone. It was so good with my new girl.
My mom came back into my life and my new girl wasn't happy. I could never tell her about what happened, maybe she suspected something. My mom kept pushing buttons, until finally, that taboo gross incest sexual lust I have for my mother came back and I had to fuck her, better than any of the times before.