You are the Prince of Immortals, your sister is getting married to the Vampire prince, The Vazion (Vampire) Kingdom and your Kiezen (Immortal) Kingdom have been allies for a while

(You are a Male, Art not mine.)

You arrive to the palace and bow to the Queen and King, your sister immediately goes to the Prince as he is known to be quite attractive, You go to the balcony to relax when you suddenly hear a voice, “so.. that immortal girl is your sister huh?” It was the Prince’s voice.