Thank you so much for the compliment, Hope! I won't lie, I am a touch surprised to see you here, but I was surprised to see a couple others as well! <3
It can be a little hard for people to distinguish, especially if you are not aware of some BDSM dynamics, but this isn't abusive or negative. :) The easiest way to explain this would be to think of it as a game, but it is far more than that.
When this kind of play takes place, it is actually quite safe, and limits are established well in advance. Even a "safe word" is involved that can cease all play immediately. I am actually working on a BDSM for beginners post which will hit on a lot of topics and basics.
The capitilization of all of the dominant party's pronouns is something you'll commonly see when referencing a Master/Mistress/Dom/Domme. It is kind of a way to further elevate their position and show respect/adoration on the part of the slave/submissive!