In my version of A Day with My Prince, I've introduced a friend, Cindy, for the narrator. In a very simple way, her role is to nudge along the narrator's hopes and expectations. At the start of the day, she's almost as excited about the 'date', even though she isn't even going, and later she suggests Prince James may be falling in love with her friend.
Characters like Cindy can be used to say what would otherwise be just thoughts in a narrator's head. Also, but admittedly not in a very subtle way, I have added lines to try to describe how the narrator's view of what makes a perfect prince change during the course of the day.
So, when she first meets Prince James, the narrator thinks 'he's so handsome'.
Later when he talks to her, she says, 'I couldn't believe how warm and friendly he was'.
During the course of the afternoon, she thinks about what Cindy said to her, until, in the hotel room, she starts to write her an SMS message 'telling her I thought she might be right about the prince falling in love with me'.
Finally, the narrator agrees Prince James is the ideal prince 'because, not only is he a faithful boyfriend, he is also kind to everyone and conscientious about his work'.