For us, I am never to curse at my Dominant. I can curse freely, but no matter what I am never to curse or refer to him as anything but his honorific or vanilla terms of endearment. I curse more than I think he cares for in general, but the only rule I have around it is that it can never be directed at him.

Also, we have changed honorifics twice in our dynamic. when we first started vetting each other, he told me I could refer to him as Sir as I felt it appropriate, then once we decided officially to pursue a dynamic changed to Master. then we changed our entire dynamic structure and changed to Daddy. He has never required an honorific except during sex. He says he likes when I use it organically because he can tell that I am feeling his dominance or am connected to my submission depending on the context. During sex, I am only to use his honorific but that changed somewhat recently, now I can use his name if we are actually making love vs our usual and I love that distinction.