While Carley Fortune’s “Every Summer After” isn’t a YA novel, it has a lot of the same themes of first love, regretful decisions, and emotional memories as “The Summer I Turned Pretty.” A decade ago, Persephone left her coastal small town behind, including Sam, the guy she spent six years falling for before everything fell apart. Now, she’s headed back to their hometown for his mother’s funeral, and all those mistakes from the past come right back to the surface.