I have always enjoyed the 'ODS' series. But this book was my favourite.(given that I haven't read the 6th part yet.) 
 Not to mention,the "Friends to Inseparable Lovers" theme is one of my personal favourites. 
 Basically,this story focuses on Olivia Holloway and Nate Sawyer,who are good friends. Olivia cannot consider Nate as more than a very attractive and faihful friend,beacuse she is painfully shy around men. Nate on the other hand, values her frienship more than anything else because of his past that holds him back. 
 A simple lesson in seduction takes a more serious turn when Olivia falls for Nate.Nate's transition from being downright sceptical about love to being a faithful lover is well written out by Samantha Young. Enjoyed reading it a lot!