Hell for the Holidays by K. Simpson

Devlin Kerry and Cassandra Wolfe lead very complicated lives. They're in advertising, they're a couple, and they each have a personal demon. They decide to cap off a perfectly hellish year by spending Thanksgiving with the Wolfes and Christmas with the Kerrys. Between their crazy demons and even crazier families, Dev and Cassie are reminded that there's no place like hell, um, home for the holidays.