Christmas with You by Jess Mastorakos

Cooper sighed and lowered his forehead to mine. “I’m really getting sick of people interrupting us when I’m trying to kiss you, Angie Black.”
“Then stop trying to kiss me.”
Marine Staff Sergeant Charles Cooper is desperate. When he idiotically made up a fake girlfriend to appease his grandmother, he hadn’t counted on Grandma Jean flying halfway across the country to meet her at Christmas. With only a few days until the big family dinner, he needs a girlfriend. Fast.
Angie Black can think of few people who get under her skin more than Cooper. Unfortunately, she has to tolerate him since their best friends are married to each other. When Cooper asks her to be his fake girlfriend for a family dinner, Angie agrees only because she could use a fake boyfriend herself. Her entire office is invited to the wedding of their boss, and he happens to also be her ex.
Their fake relationship seems to solve both of their problems. That is, until unexpected feelings arise. With his deployment looming, will they figure out that they’re meant to be before they find themselves half a world apart?