Lady Nightshade by Francine Whittaker

Kenny Phillips does not like dominant women. Not any more. Not since his Mistress betrayed him. But when he follows up rumours about strange goings on in a remote castle in Spain, he finds out that his resolve is not quite as firm as he thought. Through Mistress Celandine, Mistress Angelica, Mistress Foxglove and most deadly of all, Lady Nightshade, he is brought to a full understanding of his place in life.

Now firmly established as one of the foremost erotic authoresses currently writing, Francine Whittaker again serves up a cruel, ingenious and spellbinding tale of dominant females and their male slaves.

Daughters of de Sade by Falconer Bridges

Julian thinks that Mistress Madonna is the Dominatrix from Hell; but, no matter how much she might turn his dreams into nightmares, he dreams of being thought worthy enough to make love to her. Mistress Madonna, however, does not believe in giving men what they want, only what she thinks they deserve. If they are especially loathsome, she might decide that they deserve being handed over to her sisters, the Daughters of de Sade.