Wicked Pleasure by Nina Bangs

In the second book of her series centered around the Castle of Dark Dreams, Nina Bangs focuses on Brynn, a demon of sensual desire, and Kim Vaughn, a demon hunter from a long line of demon hunters.

Brynn doesn't remember where he came from. All he can remember is his curse that forces him to offer himself to any woman he's with for more than an hour. Because the curse takes away all choice for Brynn, he tries to avoid being around women for longer than fifty minutes at a time. However, things start changing when he meets Kim. The more he's around her the longer he can be around her without his curse kicking in.

However, Kim has decided that all she wants in life is nothing more than being normal. She has come to the Castle of Dark Dreams as an architect, not a demon hunter. Unfortunately for her, demons seem to be popping up everywhere she goes and she can no longer avoid the family business. With the help of her demon destroyer, Fo, she is ready to help eliminate the demons attempting to take over Galveston.

With all of that going on around them, Brynn and Kim still find time to explore their undeniable attraction to each other. They are great characters who have a lot of issues to get over in order to actually be together.