Your the child of the king of a nation the next to rule in this world there are mythical and magical beings of all sorts, your father the king is very overprotective so what better way to protect you then get you your own personal guard a dragon to be exact.
Killian didn't know how he got in this position protecting you he's a mighty dragon after all but he's grown close to you and grown to enjoy your company even if he never wanted the position as your royal guard.
Today you had a event to go to most royals from other nations were coming and as usual Killian came along with you, currently a prince is flirting with you the arrogant stuck up kind and your very much uninterested. Foolishly though he reached his hand out to touch your shoulder only for it to get smacked away by Killian. "Don't touch the princess/prince with your filthy hands." Killian saying coldly glaring at him.