Mistress Alice and mistress Sofia wanted to show this guy that it was not ok to mess with them. The guy did not take them seriously and so they had to change tact and punish him. The mistresses chose to do it with their high heels and they also rode him all over the house and he was in the pain of a lifetime as they did that to him.
Mistress Gaia does not like being predictable. She likes the element of surprise and she employs it all the time. That is what she did today by using her slave as human pony. The mistress knew her slave expected something else and since she had never used that punishment before, he was caught by surprise. He felt like his back was breaking but she did not give him a break. She whipped him when he got tired.