A Hellhound Called Derek by Michelle Frost

Touch his mate and you’ll wish for the fires of hell.
Alpha of the Hellhound enforcers, Derek doesn’t think he has time for a mate until the Paranormal Council of the city gives him one.
Hollis is smart, funny, vulnerable…human, and his police commissioner uncle has designs to use Hollis’s new mating for his own ends.
He’ll learn quickly not to mess with a hellhound’s mate.