The Darkhorse — Selena Laurence

Jeff Thibedeux is a soldier who's married to the military, and things like family and holidays have never meant much to him. But when his commanding officer tells him a promotion to General won't be forthcoming unless Jeff can get an actual wife by Christmas, his world is turned upside down. 

Lisa Scotch has been burned by her ex-husband, a soldier who took off, leaving her with no forwarding address and enough debt to sink the Titanic. Christmas is looking nothing like the season of joy until Colonel Jefferson Thibedeux walks into her life and turns everything upside down.

When Jeff discovers Lisa, a pretty school teacher who needs cash quick, he sees the answer to both their problems. He'll pay her bills, she'll be his wife in the eyes of the law, and more importantly, the Pentagon. It should be all business, but feelings soon spark like the Christmas lights. Can this business arrangement become pleasure, or even something more? 

Soldier for Love is a marriage of convenience, holiday romance with plenty of steam, hot chocolate, and mistletoe, plus a happily ever after that's worthy of a promotion.
*Note: This book was previously published under the title The Darkhorse*