Falling for the Fake Fiance by Jennifer Blackwood

Jill Michaels prides herself on one thing: being independent. That is until her daughter gets into an elite school, and she needs money more than ever. It seems her fairy godmother—aka her deceased Grammy—has granted that wish in the form of one-fourth of her estate. The only catch? She must be married by her thirtieth birthday. In two months. Aaron Collins is fresh out of the army and back in town to help his father’s failing business. When he runs into Jill at a hotel where she’s attending a single’s mixer, he makes sure she doesn’t make it past his room and into another guy’s arms. When he hears about her predicament, he has a plan: they’ll get married and keep it a secret. And maybe have a little sexy fun until he leave towns for his new job.
But letting go of the woman of his dreams may be harder than Aaron could have ever imagined.