Red Hot Christmas by K. Larsen, Mara White

Amber and Frankie both work in the Empire State Building. She’s a tightly wound, high-powered executive and he’s a janitor in the maintenance department. Amber is busy planning the Christmas party for her firm, while Frankie’s muscles are quickly earning him Internet stardom.
On Christmas Eve, the temperature skyrockets, leading Amber to investigate the problem. Restricted access elevators leave her locked in the basement with nothing but a bottle of Fireball and a plastic cup full of red hots.

Will Amber be destined to spend the night alone or will a sexy janitor be in for one hot Christmas surprise?