Book One of the Balance Series. Can be read as a standalone.
Botis, demon lord and ruler of sixty legions is having a rough day. Lucifer set him on a quest to find the potion given to Gilgamesh thousands of years before, which should be easy enough. But being told a visit to the Angel Raziel was a necessary part of the mission wasn't so easy to understand. Everyone knew that demons and angels didn't mix, and angels were strictly off limits for his kind. Which was a shame because the moment Botis set eyes on the sexy Raziel his imagination ran into overdrive.
Raziel has a cruisy life. As the Angel of Secrets there aren't many who darken his door with requests for finding strange artifacts any more, but he's content. He has his shop, his taxi and his good friends, Anael and Uriel. Having Lucifer in his cab was the first sign things were about to change, but when Botis walks into his shop, Raziel starts to seriously reconsider his angelic abilities. No demon should be able to tempt him, so why was he affected by Botis's sheer presence?
Soon enough, Raziel and Botis learn their meeting was no accident. With forces at work beyond their control, they have to learn to rely on each other if they are going to beat the odds stacked against them. But how is that possible when Raziel's untouchable, and Botis doesn't have a heart?