Now, me personally, I"m not sure i'd like to do that to a sub, BUT if the sub enjoyed that sort of situation/pose, well, far be it from me to put her there and help her to indulge. I'd just have to "protect" her later, ahahahaha.
Lovely pose and the lighting is devastatingly good. Makes her look vulnerable, forced, pushed to her limits. I can almost her her whimpering with anxiety and arousal.
Great lighting and pose for the scene, and a well done concept! If I were shooting it, I might have used a more "crude" so to speak binding on her ankles to match how her wrists are bound. The scene sort of suggests she's been kidnapped or being held hostage in some convenient location by a person or persons, who aren't bondage experts, just looking for a way to keep her conveniently restrained. But that's just my take.