Effort, that's what Princess Jessie wants to see from her male property, effort! It's not just about diligently washing her feet while she texts her girlfriends, that represents the bare minimum of effort. She also wants to see the slave happily and enthusiastically drink her dirty foot water afterwards. Doing so shows loyalty and adoration of all things Jessie, and makes it much more likely that she will keep this pet for future use and .