There are lots of things a submissive woman can do, when her Sir is in that most imperious, imperative mood. 

Obviously, doing as she’s told is paramount. But, as is so often the case in interaction between Sir and girl, it’s the details that carry so much erotic heft. 

He watches his girl. But though he loves her, and her body, and her desire to obey and please him, it’s the details he’s learned to notice. She holds herself on tip-toes. 

He wonders why that detail is so significant. It’s partly that she wants to place her body to advantage visually, since she knows he will be watching her closely while he punishes her.

She gives up control once she’s on tip toes for him. She doesn’t have her feet on the ground. And so she’s on his ground.