I had rough sex with my stepsister and she wanted me to penetrate her anus

I've always had a thing for my stepsister. Not in a weird way, but she's just so damn hot! She's got these killer curves and natural tits that drive me wild. Anyway, one day we were alone and things got heated. She was teasing me, showing off her big pussy and tight ass. I couldn't resist. We started off with some rough sex, and then she surprised me by asking me to penetrate her anus. I was more than willing to oblige. She moaned in pleasure as I fucked her tight ass, and I could tell she was enjoying it. After a while, I couldn't hold back any longer and I came all over her ass. It was a sight to behold, seeing her 18-year-old body covered in my cum. It was definitely a moment I won't forget.