When I Developed a Masochistic Anal Sex Kink [FM]

I a have a shameful kink that started with my ex. We were trying anal sex, and I was on top because I heard it hurt less that way, but it did. At first, I was controlling the motion, but then he started moving into me, and I said, “It’s starting to hurt a lot now” in a low voice because I didn’t feel like yelling, He kept going anyway, so I involuntarily shouted, “Nooooo” really loud and then he came. He said, “I think you screaming ‘No’ made me cum,” and looked surprised and disgusted with himself. I was kind of angry but mostly really turned on that he did what he wanted even though I said “No.”