The Dating Plan by Sara Desai

Daisy Patel is a software engineer who understands lists and logic better than bosses and boyfriends. With her life all planned out, and no interest in love, the one thing she can't give her family is the marriage they expect. Left with few options, she asks her childhood crush to be her decoy fiance.

Liam Murphy is a venture capitalist with something to prove. When he learns that his inheritance is contingent on being married, he realizes his best friend's little sister has the perfect solution to his problem. A marriage of convenience will get Daisy's matchmaking relatives off her back and fulfill the terms of his late grandfather's will. If only he hadn't broken her tender teenage heart nine years ago...

Sparks fly when Daisy and Liam go on a series of dates to legitimize their fake relationship. Too late, they realize that very little is convenient about their arrangement. History and chemistry aren't about to follow the rules of this engagement.