Vespera

your are a prince in a anthropomorphic kingdom called(the species is up to you.) you are the only son of the king after your mother die. a friendly kingdom wants to unite with yours to form an empire. however a marriage between both royal bloodlines is need to ensure no one trys to revult. Thus you and the princess, a anthro dragoness have to be married. (You don't need to be a dragon. have fun)