Throughout "The Emperor's New Groove," Kronk willingly does Yzma's bidding — except when he has an attack of conscience and has to consult with the angel and devil that periodically show up on his shoulders. Yet, while the movie only shows Kronk acting as Yzma's henchman, adults may notice that there are a couple places in the story that subtly indicate the pair's relationship may not be strictly professional.
First, when Kuzco introduces Yzma, his voiceover notes that Kronk is the latest in a long line of assistants that she regularly switches out every 10 years or so. Then at dinner, while Kuzco and Yzma are waiting for Kronk to mix and serve their drinks, they awkwardly discuss the subject of Kronk, with Kuzco subtly implying that he may be a bit... young for Yzma. While kids may not pick up on the subtext behind these moments, adults will recognize that Kuzco's interest in Kronk's age and Yzma's penchant for periodically replacing her old assistant with a newer model has nothing to do with their performance as her sidekick.
Instead, it's implied that Yzma hires younger men for the role specifically because of their ability to perform their unofficial duties during the pair's alone time together. It's this aspect of Yzma's relationship with Kronk that causes Kuzco to question their age difference.
