American Fantasy by Emma Straub

Annie is: On a cruise with her one-time favourite boyband and a thousand female super-fans. Still reeling from her divorce. Being replaced at work by her intern.
 
Keith is: Fifty years old and in a band that performs dance routines with hip thrusts. Suffering from sea sickness. Certain his wife doesn’t love him anymore.
 
When a meet-and-greet throws them together, Annie develops a crush on Keith, and Keith starts to wonder if life might have a few surprises in store for him. But are Keith and Annie just living a fantasy? And what happens when they get back to shore?