Loved the relationship Mack had with Frankie. It was great to see the flashback at their time 8 years ago when they loved each other but couldn't do anything. 
 Mack is such a sweetie and I love how he never gave up and did anything and everything to get a chance with Frankie again. 
 I loved that Frankie could relate to Jonah and ends up helping him. I've never heard of pure o. That was definitely interesting to read about. 
 The first time they kissed and we're together was hot. it had definitely been building to that. 
 (view spoiler)[The whole Mack's dad being his son's real dad reminded me of Egomaniac. 
 This one had a better ending though. (hide spoiler)] 
 Another great book by Penelope Ward.