Bart normally isn’t easily swayed by those with feminine wiles and charms. However like most people, he does admittedly have a type. In his case… he’s got a thing for women who are confident and assertive. For some reason, hearing a lady bluntly announce what she wants from him makes him smile. Lucky for him that Princess Pig is just the kind of person to do that.
Bartleby: “Of course I’ll fill that up for you, Your Majesty. Anything else I can do for you, my dear?”