You have done some great work on her. You can't train a woman like this overnight. You rarely see this level of submission from a woman, allowing herself to be used and degraded on camera. It's clearly taken time and persistence to bring her to this point. I can relate to it as over the course of a decade or more, I have established anal sex as the main form of intercourse with my wife. Like the woman here, just looking at her anus you can see that it's regularly been used for sex. I really enjoy seeing women shaped and adapted to fuck the way their man most prefers.
Miss this couple, I got to see some of his private stock footage, and he really beat his slave roughly before using her. Good obedient bitch she is. Hope he is still using her like this