This dirty cow decided to masturbate without permission and got incredibly filthy and messy in the process. It was necessary to wash off all the milk and teach her a very valuable lesson: her only purpose is to serve, her body doesn't belong to her and she doesn't get to decide when she gets to experience pleasure. The only time she gets to play with herself and cum is when she's ordered to do so. Clearly more training will be necessary to get her behaviour in order.