Character Aesthetics

Calista the stubborn, introverted and shy Princess of Swindell.
Alexander the charming, arrogant and entitled Prince of Hendrix.
Everyone knows about the everlasting rivalry between the kingdoms of Swindell and Hendrix.
But what happens when Calista's best friend Olympia, the Princess of Sapphirus is engaged to her mortal enemy Alexander, the one person whose guts she hates more than anything?