G.C. Scott 
His Mistress’s Voice [EPUB ebook] 

Tom’s weekends with Beth have become the focus of his life. Her skillful alternation between dominatrix and slave makes Beth his private fantasy goddess, his secret and supreme lover. Never before had he been with a woman who tied him up so thoroughly and then turned the tables, having him do the same to her.
Sensing a powerful, animal drive within Tom that echoes her own, Beth decides to make Tom’s initiation into bondage a swift one. His hesitant first steps soon quicken as he is drawn further into her dark and intimate web. Just when their relationship seems to have reached its peak, Beth introduces him to Harriet—and the games suddenly become even kinkier, more convoluted, and far too intense…