M/s relations are different than D/s. Difference bettwen it are those in the M/s realtion. In a true Master slave it is more control for the Master too restrict speech patterns and that the slave use herself in a sentence as a thrid party when speaking to her Master fr herself. But as always it should be what the submissive and Master talks about and what they want.
In my relatioship with my girl it is something she wants and I want so it consenual. It helps her feel more submissive and closer too me.

MrDom