Title: In the Sheikh's Service
Description: Uncaging the lion of the desert… 
Sheikh Shazim Al Q'Aqabi is horrified to discover that the woman who will execute his late brother's conservation dream is the exotic dancer he encountered in London! 
But Isla Sinclair's feisty nature is like a cool glass of water in the desert to the unchallenged ruler. For his entire life, Shazim's only mistress has been duty. Now he's considering a far more pleasurable way to spend his nights under the desert stars. 
Yet acting on his desire for such an unsuitable woman would be tantamount to treason! Shazim will have to make the hardest decision of his life… 

Isn't there a very similiar story? Perhaps in the Chatsfields sagas?
Subjects: Fiction, romance, general, Man-woman relationships, fiction
People: Shazim Al Q'Aqabi, Isla Sinclair