Submission Box Set

A five book box set where different types of women find that the path to fulfillment lies in submitting to a dominant man, comprising:
Sex Exchange, where an unscrupulous saleswoman meets her match in more ways than one.
Mastering Her Mania, where a mischievous player of games pushes the wrong man too far.
The 6:18 to Bondage, where a sordid encounter on a train leads to trouble then a night to remember.
The Unseen Master, where another saleswoman blindly submits to a man she's never seen.
Enslaving Kyla, where a relationship is rekindled through formalised submission.