Ivyrson is the quintessential Scrooge when it comes to anything having to do with the holidays. However, the chance to win a hefty chunk of money and free repairs on his old home is enough to entice the man to take part in a holiday-themed reality game.
Emory has had a crush on his older brother's best friend for years. When the chance to help Ivy possibly win a reality game comes along, Emory doesn't hesitate. After all, that's what friends are for.
The two men have known each other forever, but living together and pretending to be a couple means getting to know each other on a whole new level. Can they convince the viewing audience their fake relationship deserves to win the grand prize? Or will Ivy and Emory get swept up in the holiday magic and find themselves falling in love for real?
Once Upon a Christmas House is a steamy, forced-proximity, fake relationship, M/M Christmas romance between a grumpy Scrooge and his best friend's cheery little brother. 
