She Called Him Sir

She didn't know his name. After working a year in Europe, Riley feels she's jaded, and is considering going home, until a one-night-stand with a handsome Englishman at a party turns into something quite a bit more. Working at a cafe, Riley's looks get her invited to all the best parties. But after a wild, thrilling evening of hot sex she gets invited to be the personal assistant of a wealthy Englishman -- who refuses to give her his name and who does not want to know hers.
He calls her Fire, after her hair, and wants very personal services indeed. Nor is he reluctant to punish her whenever her services fail to measure up to his requirements. To Riley it's a dark, kinky, exciting job which pays awfully well and takes her across the world. But the sex gets kinkier, and the submission he requires begins to shift her from the role of a personal assistant who sometimes provides sexual services, to a sex slave who sometimes performs secretarial duties.
And when Sir isn't available to discipline or make use of her, well, he has other employees and friends who will.