What about slave statuses for the Muds. Like instead of just Mudokins scrubbing and washing the floors you can have dilivery Muds or chopher muds to transport Glukkens to where they need to go or have a Mudokin secretary for a Glukken. Kind of like something from Planet of The Apes. Where you had one humen slave doing chores for that rich family and that he was sort of a special slave.
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