Mistress BlackDiamoond and mistress Aurelia wanted to see what this slave was made of. He was a new slave and had not yet been humiliated. The mistresses waited till he had messed up and they had fun humiliating him. They had the loser lick their feet which they conveniently made sure were smelly and stinky. At the same time, the mistresses wanted the slave to jerk off while he licked their feet.