The Prince Diaries (A Princess Diaries spin off)

Trevor Phillip Thermopolis-O'Connell is a pretty average 19 year old, aside from being a duke of the small european country known as Genovia and the younger half brother of reigning queen of Genovia Queen Amelia Mignonette Thermopolis Renaldi. But with his title comes pursuers, and quite a bit of danger.
Avery Quinn Yarrow will be 19 in a month and a half, and they are looking for a job. What will happen when their uncle Joe recommends them for Duke Trevors personal assistant?

I don't own any characters except for Avery and any other oc's that may appear. I do however own the plot line.