She doesn't consciously notice that it's easier, freer, to move, but she does take advantage of it!

She rocks against his mouth, rolls her hips a little as he pleasures her. (And OH, he is so good at pleasuring her. His mouth on her cunt is bliss, the noises of pleasure she's making are obscene, and she doesn't CARE.)

When the coil of pleasure snaps, her cry of his name has inhuman edges to the sound. She's trembling with the aftershocks, still perched on his mouth. It's going to be a little bit before she can manage moving off of him.