This mistress was angry at her slave but she did not want to punish him with pain. Instead, the mistress chose to use her shit to punish him. It was a cruel punishment but at least it was not painful. It worked like a charm as the slave had never imagined in his wildest dreams that he could get degraded to that extent. He changed instantly and they never had issues again.
This slave was cunning and the mistress found it a little funny but it had gotten to a point that he was taking advantage of it to avoid doing certain things or to come up excuses for why he had messed up or why he did not do something. So she out an end to that by shitting on him and forcing him to stop using that to escape accountability.