In this retro-futuristic scene, two princesses have snuck down to the castle dungeons, where their step-dad - the king - keeps prisoners. The two royal ladies find a slave strapped to a milking machine, mouth taped, blindfolded, and bound. Spoiled and sadistic, with no empathy for him at all, they decide to start the milking machine just to watch what happens. They're fascinated to observe him twitch and cum as a result of his cock getting stoked at a high speed by the milking machine. Includes POV version from the slave's perspective.