The page says the one on top decides and Malfoid has decided not to stop, and the room finds out slowly that she means it.

Mione's hands come off her thighs. Then they come off again. Then she stops lifting them.

CorvinaThat is enough. Malfoid. That is enough.

Malfoid puts one hand flat on Mione's stomach and presses down and says that the page does not have a word for enough in it.