Mistress Anfisa wanted to try something different. She was bored using one punishment method and she had to change it. She chose to turn her slave as her human pony and she rode him all over. She had a great time and knew it was effective as he was begging for mercy and collapsing all the time from her weight. She would whip him to get him back up before she felt it was enough.
Princess Serena wanted to show this loser what awaited him if he did not cooperate with her. She rode him like a pony and she whipped him too. She did not care about what he felt. She had fun turning him into her human pony that she did not worry about how tired he was or how painful he felt. She had time to kill and she spent it humiliating him.