Mine To Honor (Southern Wedding Series Book 7) (Southern Weddings) by Natasha Madison : Kindle Edition

From Wall Street Journal & USA Today bestselling author Natasha Madison comes a small town, best friends to lovers, fake marriage, and forced proximity romance.
When your best friend asks you for the biggest favor of her life.

EVA
Things were finally looking up for me.
I was my own boss; I owned my own house—
and I recently was contacted by an older sister I didn’t know I had.
Everything was perfect…until tragedy struck.
All the things that had come into my life were suddenly gone—except for one thing: my niece.

LEVI
I was a confirmed bachelor.
I was married to my work and committed to nothing more.
No woman was going to change that.
Eva is my best friend and needed a life-changing favor:
Marry her so she could gain custody of her niece.
A marriage of convenience that would only last a year, tops.
But there were stipulations we hadn’t planned on.
Things got blurry—lines got crossed.
I would honor my commitment…I just hope I can walk away.