Mistress Gaia and her friends lady Scarlet and mistress Tatjana realized they were dealing with lazy slaves and they could not let it continue any longer. That is why they went out of their way to degrade as well as humiliate them. They had to make honest and hardworking men out of them and this was done as they were pony play trained and forced to endure pain and humiliated.
Mistress Electra needed to dominate this loser and she did it with her pony play training. The mistress had fun riding the guy's back. He could not do anything about it as he knew that he risked angering mistress Electra and would attract a worse punishment from her. She also whipped him and she made sure he was in pain for the whole exercise to be as effective as she wanted.