In the bedroom Malfoid tells her to undo the dress and stop at the waist, and Mione does it in the time it takes to explain.

MalfoidStop. Hands at your sides. Do not cover yourself and do not move until I say.

She stands there with the wool open to her hips and her chest bare and her hands rigid at her sides and does not once ask whether she is doing it right.

MalfoidYou are very good at this. I am going to be extremely careful about that, because I know exactly what it costs you.