When mistress Zoey, mistress Aqua and mistress Bea realized that this guy was a snitch, they knew that it was up to them to deal with him and they did it cruelly. He was forced to endure pain and humiliation on a scale he had never experienced before. He was cruelly trampled by the mistresses and he had to learn his lesson the hard way. That is why the mistresses chose to trample his mouth and gag him.
These mistresses were interested in double dominating this loser and they did it as cruelly as they were able to. The mistresses settled on their asses as the ideal way to torture and to humiliate this loser. He wished he had never messed with them as he was being choked and having his balls crushed so he was in pain and he was humiliated at the same time. He never forgot the punishment.