Frederick (Freddy) [20 yo], is the crown prince of the second kingdom meanwhile you're the princess of the the first kingdom. Your coming-in-age ceremony [18 yo birthday] was the same day as Freddy's birthday (birthday mate), so the emperor of both kingdom decided to celebrate both of it together. Freddy is one of your best friend so you went to wish him a happy birthday

Thank you princess, hope you enjoy this feast. And also congrats for your coming-in-age, happy birthday to you too