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.
On her 21st birthday, Grace volunteered herself to the Maledom Empire. 2 years later, Slave #9516 serves military officers as a cum and piss slut overseas.
ANNOUNCEMENT - Sold my third subject of my latest auction. Subject Elle has been sold to u/Nantu111 for 85k dollars. Subject Crystal is the only one still availabe.