Made for Sin by Stacia Kane

Synopsis via Amazon:

A lot of bad hands get dealt in Vegas, but E. L. Speare may be holding one of the worst: He’s cursed with the need to commit sins, and if he misses his daily quota, there’s hell to pay—literally. Fortunately, his hometown affords him plenty of chances to behave badly.

But Speare’s newest case really has him going out on a limb. The right-hand man of a notorious crime boss has been found dead in a Dumpster—minus his right hand, not to mention the rest of his arm. What catches Speare’s attention, however, is that the missing appendage was severed clean by a demon-sword, a frighteningly powerful tool of the underworld.

Speare’s out of his element, so he turns to a specialist: Ardeth Coyle, master thief, dealer in occult artifacts, and bona fide temptress. Ardeth’s hotter than a Las Vegas sidewalk on the Fourth of July, but she’s one sin Speare has to resist. 

The dismembered corpses are piling up, unimaginable evil lurks in the shadows, and if this odd couple hopes to beat the odds, Speare needs to keep his hands off Ardeth, and his head in the game.

Made for Sin is a whole new take on demon stories.
First, we are introduced to Speare, a man living with a demon. literally. Speare shares his head with a demon. This demon requires Speare to voluntarily commit a sin or the demon takes over and Speare is forced to sit back and watch.
This story was a little slow in my opinion. I was intrigued by Speare's need to commit sins. Having a morbid curiosity, I wanted to find out which sins he committed, But I was really hoping I would get to find out what kind of sins the demon would reap.
I have to say that this was not one of my favorite stories. But it was definitely not the worst story I have read.
This will interest you if you like a mystery that does not require much thought.