My best friend revealed to me that he was arguing with his girlfriend while she was on top of me, enjoying ridiculous things

I was hanging out with my buddy, chatting about nothing in particular. Suddenly, his girlfriend hopped on top of me and started riding me like a wild cowgirl. My friend got all worked up and started yelling at her. I couldn't help but find the whole situation kind of ridiculous. She was totally into it, bouncing up and down on me while my buddy stood by, fuming mad. As for me, I was just enjoying the ride, even though I knew this wasn't exactly the norm. My buddy's girlfriend is definitely not your typical gal, more like a hot, curvy Latina with a big ass that's begging to be spanked. She's got some skills in the bedroom too, riding me like a pro and making me forget all about my friend's ranting. I'm pretty sure she's got some action on the side, maybe even with another guy. Who knows, maybe she's a prostitute or something. Either way, she's got a tight ass that's worth every penny.