Stepbrother wants me to show him ANAL SEX?! He FUCKS MY ASS!!

I was just laying on the recamier in the living room playing something on my phone when my stepbrother walked by. I thought I'd just ask him when our parents are coming back. An hour was his answer. Then he suddenly says that he has a question for me, namely "Have you had any experience with anal sex?" I was flabbergasted at first, then I said that I think it's pretty cool... He probably wants to try it out with his girlfriend and is unsure how he do it like that. I tried to show him but as soon as I put my fingers in his ass I saw the mega boner in his pants. He fucked my ass hesitantly and slowly at first, but pretty quickly just deep and demanding... missionary, doggy and then cowgirl. What was your hottest anal experience?