[Sharp Shooter]

I very much agree with the caution how the constant use of certain degrading or humiliating words can have a cumulative effect on a submissive. Eventually the meaning and intent of the words will go deeper into the sub's psyche than anyone may have originally intended.

For that reason, it's even more important for the dominant to take control of the situation, to modify or even stop the harmful behavior (ironically one that the sub wants yet the dominant makes happen) to protect the wellbeing of the sub.

The final responsibility belongs to the dominant, regardless of whether the sub "asked for it" or not. Failing to protect the sub is probably the most serious fault a dominant can have.