What a petite Indian girl with a neat pussy and what a big dick on a cowboy! That's the combination for maximum effect and penetration. As for the role-playing, who knows, maybe at first it was like that. After all, white conquistadors were something new to Native American girls, and there's no way they weren't drawn to try white dick for a taste. The couple are good, and nature allows them to play this kind of role play. We can't really run around like that, or we have to go very far away, and you can't find such beauty there.
Well I do not know about the undeveloped ass, in my opinion a man very intensely and without preparation fucks a lady in the ass, and she gets a lot of pleasure out of it! So I think the ass is quite well developed.