Yeah... no. 
 Dont need to read about OW trough the whole book, lol. 
 (view spoiler)[ 
 - Hero was with this sub just week before he met heroine (and of course she is stunning) 
 - Descriptive sex with this OW when hero took her virginity 
 - Lot of other detailes about their (H and OW) sexual past 
 - Hero paddle OW 
 - OW cause drama and is present until the end 
 (hide spoiler)]