The first in the new PLEASURE PRINCIPLE series from the NEW YORK TIMES bestselling author Overtime has never felt so good... Marin Rush loves studying sex. Doing it? That's another story. In the research lab, Marin's lack of practical knowledge didn't matter, but now that she's landed a job at The Grove, a high-end, experimental sex therapy institute, she can't ignore the fact that the person most in need of sexual healing may be her. Dr. Donovan West, her new hotshot colleague, couldn't agree more. Donovan knows that Marin's clients are going to eat her alive unless she gets some hands-on experience. And if she fails at the job, he can say goodbye to a promotion, so he assigns her a list of R-rated tasks to prepare her for the wild clientele of The Grove's X-wing. But some of those tasks are built for two, and when he finds Marin searching for a candidate to help her check off her list, Donovan decides there's only one man for the job – him. As long as they keep their erotic, off-the-clock activities strictly confidential and without strings, no one will get fired – or worse, get attached...