Passing Through Purgatory by Nikole Knight

When Oliver applied for a job in the Hell dimension on a whim, he didn’t expect it to turn his whole world—or his heart—entirely upside down.
Recently graduated at twenty-six, and two months behind on rent, Oliver Barnes is desperate. So desperate, in fact, that he applies for a job in the Greed district of Hell’s Pentagram. But when he misses his train and, subsequently, his job interview, he stumbles, instead, upon a strange little coffee shop in the middle of Purgatory’s barren desert—and into an unexpected opportunity.

It isn’t the job he came to Hell for, but maybe it’s exactly the job he needs.

As he navigates the demon dimension and tries to survive the ridiculous shenanigans of his unholy co-workers, Oliver soon falls head-over-ass for a tentacled lawyer with electric fingers and a deadly-sharp grin. Together, they discover that, sometimes, love and happiness can be just a train ride away.