I enjoyed this book! Riley (fmc) is pregnant and mmc is non bio dad (I loveeee these tropes)! Nash's sister is Riley's best friend and has always been yearning for her. He finds out Riley is pregnant and struggling with health issues and preparing to be a single mom. Nash has Riley move in with him and marry him for insurance because of Riley's pregnancy related health issues. Love how Nash steps up during Riley's pregnancy and embraces being the dad ahhh so cute. Also he was so obsessed with getting her pregnant again in the future (love this trope!) 

Tropes: 
Marriage of connivence 
Hockey  
 best friend brother
Non bio dad mmc