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.
Fitonjashki need proof of their reputation as tough females in addition to firm buttocks. And who can give that? Only a tough guy. So she asked the trainer to put his dick in her mouth. Which he gladly did. That seemed to satisfy them both.