A Seductive Revenge by Kim Lawrence

Josh Prentice has a broken heart, and there's only one way to mend it: revenge! He plans to seduce Flora, and then jilt her. But he hadn't expected to find it so hard to walk away....
Locked into an intensely sensual relationship, Josh and Flora struggle with their emotions. But Josh is tormented that he could lose Flora if she discovers his true identity—and Flora also has a burning secret: she's expecting Josh's baby!