Heart of Submission by Claire Thompson
When Kate Alexander, a successful erotic romance author, attends a BDSM weekend in the city, she tells herself it's just for research. Yet she finds herself captivated by the devastatingly handsome Master John, who promises to make her deepest, darkest fantasies come true. Drawn in by his charisma and dominant will, Kate falls too far, too fast, into an erotic submission that threatens to blow her safe little world apart.
Chase Saunders, the bondage master, sees much and says little. When he perceives Kate's in danger, action becomes the only alternative. While things come to a head between the two Doms, Kate slips away, running scared. When the possibility of a loving exchange of power presents itself, will Kate find her way to the heart of submission?