A room full of power does not need raised voices to feel dangerous. Sometimes the tension lives in a pause, an unanswered question, or the discovery that someone has noticed exactly what you hoped to hide.
That is one of the pleasures of dark romance: attraction and uncertainty can occupy the same small space. A character may know how to negotiate, read a room, and keep control of every visible detail. Then one person refuses to fit the pattern.
The question becomes more interesting than who...