Lady Stefanie did not want to give this loser even an extra minute of her time. She was pissed at him as she learned that he was just wasting her time and that he was taking her round in circles. She chose to facesit on him as punishment. And as she did so, the guy did not mind that he was being humiliated and in pain. He tried to jerk off as he loved her ass and her big tits.
Lady Stefanie was not impressed with how slow her slave was learning new things. She wanted him to do things her way and when he did not learn as fast as she wanted, she chose to facesit on him and to torture him. She choked him in the process and she got him to have a reason to work harder and to learn faster because he did not want to be tortured again.