Is there a physical position that makes you feel most submissive?
Cliche as it may be its difficult to not feel submissive whilst kneeling and other subservient positions such as that. For the most part this girl doesn’t adopt that many positions that she finds to be submissive outside play, or hasn’t, maybe that will change one day now that life is yet again going in another direction.
There is a really useful little lexicon of submissive positions here, put together by the beautiful Ariel.
For the moment though this girl really feels whatever position Grimly has her in at the time the most submissive! If she is bound and unable to move for whatever reason due to the predicament she is in whether it be the chair, or a suspension rig, or a contraption of medieval torture then she will feel submissive as she is at his mercy until he decides to change or end her suffering.
Perhaps that’s a vague answer, but really there is not much more to it than that. It’s perhaps more what he’s doing or what he’s making her think about that makes her feel more submissive rather than the position.