The slave addresses all free men as “Master” and all free women as “Mistress”
The slave addresses all free men as “Master” and all free women as “Mistress.” The phrase ‘my Master,’ when used, is commonly addressed to one’s personal master, one’s owner.
Similarly, if the slave is owned by a woman, the phrase ‘my Mistress’ is commonly addressed only to the slave’s actual mistress. To be sure, the slave commonly refers to her owner as she refers to free men and free women in general, namely, simply as “Master” or “Mistress.”
Prize of Gor, p. 527