As tops and bottoms may not be in a power exchange relationship at all, honorifics may not be used at all. The term "top" or "bottom" may simply be used to designate who is doing - or receiving - an activity. No power exchange relationship is required for activities to occur.
More About a Top in BDSM
Tops are known by many names. The names that they choose to use are largely determined by gender and personal preference. A female-presenting top may be referred to as a Mistress, Dominatrix, Madame, Goddess, or Mommy. A male-presenting top may be referred to as a Master, Dominant, Sir, or Daddy.