Vampire's Bloodshed: An Akaisha Morningstar Book:

After her first article on Professor Mozart Jay Newton was well received, Akaisha was in search of her next big story. Only, Professor Mozart wants her to become his heir and take over his research and company. Remembering how much stronger he is Akaisha took to asking the Vampire Queen, Kiaya, for help. In agreement with her second in command Jay, they began to help her as long as she returns the favor, in the future.
Not long after, Kiaya call in her favor. Vampires, lesser, and day walker...