Jessica Hart 
Whirlwind Engagement [EPUB ebook] 

Josh and Bella have been friends for years, but suddenly Bella is starting to see "her Josh" in a very different light. She’s falling in love! It’s confusing enough but, worse, Josh has just asked her to be his pretend fiancee…Josh needs a stand-in fiancee to clinch a business deal. Bella finally agrees to play the part but, after they spend a week on an exotic island pretending to be head over heels in love, the tension becomes almost unbearable! Especially when Josh starts to wonder if his best friend is pretending at all…