Queen Melisende's beauty is well known and coveted by many women of the kingdom, craved to posess by the men. With her husband presumed dead in battle, the conqueror of the last bastion of True Faith releases the people of the city, but keeps the Queen as a symbol of his own power in the land.
A few months into her solitary captivity, a mysterious man seeks out the new lord of the land, and offers to buy her--for her to disappear and cement the conqueror's claim.
Released to the man for a hefty sum, she soon finds herself the decorative centerpiece in the man's harem, located a day's hard ride from the city. Expected to serve, she finds the mysterious man to be one of her loyal knights who wishes to secure his own rise to power.
...This will be a D/s or preferably M/s arrangement where the soldier bends the Queen to his will to begin the road to retaking the kingdom. It would be ideally set in the Holy Land during the Crusades, making the knight an Ordered Crusader (of the not so pious type maybe). Ratings would be BON and NC if not EX.