Stress positions are under-rated. They are excellent prep for a punishment discipline. This is especially true if she has to hold the implement of her chastisement. Imagine her thoughts, "This cane in my mouth will soon be laying down painful stripe
If you train your slave properly, you can expect to see this kind of pride on it's face after an intense session of abuse because it's position in life is so thoroughly reinforced that it finds it's purpose in serving and accepting daily punishment.
