Royal Entrapment

The Queen is getting married and Lady Priscilla is required to work alongside the Lord Chancellor, Dominique, to ensure that the whole affair goes off without a hitch and that they don't, unwittingly, start World War Three. The only problem is that Priscilla finds Dominique insufferable and Dom isn't all that enamoured with Priscilla either.
When Priscilla's sister, Bianca, falls for Dominique's brother, Louis, the two young lovers hatch a plot to ensure that they can spend time together, but it means that Dom has to pretend to be interested in Priscilla and get her to date him.
The more time they spend together, the more Dom and Priscilla start to like each other, except that now Dom is caught in a difficult spot…should he tell Priscilla that he only asked her out because his brother wanted to date her sister, or should he keep quiet and hope she doesn't find out?