The young mother had been looking at her son's dick for a long time and he took advantage of it. When no one else was in the house he easily tricked her into sex. And as I see it, this hungry female didn't mind letting him see her charms. Only she didn't expect him to get that close to her ass so fast. But it was payback for her lust.
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.