Stepbrother prefers to have sex with my large buttocks rather than watching films

My stepbrother has a weird fetish for my big ass and instead of watching movies, he would rather fuck me. It's not like I mind, I mean, who wouldn't want to have sex with a hot 18-year-old with a big ass? I'm not sure what my mom sees in him, but I guess that's another story. Anyway, the other day, I was trying to chill with my friends when he barged in, asking me to show off my curves. I didn't mind, I mean, he's always been a bit of a perv, but things took a wild turn when he started sniffing my ass. I was about to throw him out when he started undressing me, his hands all over my body. I didn't resist, I mean, who could resist a hot young guy with a big ass? And then, he was inside me, fucking me hard and deep. I don't know how many times he came, but I was too busy moaning in pleasure to care.