When characters speak dirty, ensure their words are deeply rooted in their individual personality and current emotional state. For a dominant character, their dirty talk might be commanding and assertive; for a playful one, it could be teasing and full of innuendo. Let the dialogue reflect their unique desires and the specific actions unfolding. Vary the intensity and vocabulary based on the moment, incorporating explicit descriptions of sensations and physical reactions. Avoid generic phrases; make every word feel like their unfiltered desire.