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.
Following up with my previous post of condition of painsluts. This is how an average painslut is kept at night during their sleep, electro torture throughout with random intervals. I am certain none of the owners can give logical reasoning as to why they