Why couldn't the love interest be the prince or just someone else entirely. Really don't like the duke. He's like a tsundere but just treats her like an asshole. It's like an elementary child liking a girl but doesn't know how to show his affection.
Or better yet, get rid of the romance tag. Although I wouldn't mind a little yuri, that kiss from ch.2 was much better than forcing Hell and the duke to be together.