Lady Betty and lady Bertie caught their slave sniffing their thongs and jerking off. They did not want a pervert living in their house so they punished him. They chose to punish him instead of chasing him away because he deserved a second chance. They spat on him and slapped him brutally to humiliate and torture him. They wanted the pain and humiliation to send a message to him. He got the message loud and clear.