Pulse. Power Games BDSM Dark Romance Series, #4

Heartbroken Flora is lost without her dominant master, who has suddenly decided to stop holding their special "sessions." So when her cheating ex reaches out to her, Flora goes against her instincts and agrees to have dinner, which leads to drinks and ultimately to his bed. The tryst leaves Flora unsatisfied. Now more than ever, she wants Master and no one else. Realizing she would never be satisfied with anyone else after knowing him, she contacts Master once more, begging him to give her one last chance to prove her obedience.
As always, though, Flora won't be the one to call the shots. Master is always in control. Once he finds out how naughty she's been, he will have an especially rough, hard, and unprotected punishment for his naive protegee.