my stepmother loves that I fuck her ass when we are alone in the house, she loves feeling her ass full of my semen

I have been living with my stepmother for a few years. At first she looked at me and I didn't copy her, rather I walked away, but she looked for me. I didn't know what was happening, but one day when we were alone in the house, she looked for me in my room. She said that she was like a volcano that she wanted me to fuck her ass like no one had ever done before and coincidentally that day I was jerking off when she came into my room so no matter how much I wanted to resist the opportunity I couldn't And I ended up filling her ass to my stepmother of my milk