Joey W. HIll - Vampire Queen (#10-12)

The Scientific Method (Vampire Queen #10)
In the vampire-servant relationship, the vampire holds all the power. Being Lord Brian’s research assistant as well as his servant, Debra accepts that, but she craves her Master’s heart. When Brian notices his servant’s unhappiness, he uses methods they both understand to prove just what belonging to him fully means.

The Scientific Method is the tenth instalment in the Vampire Queen series. While this book can be read as standalone, the author suggests familiarity with Vampire Queen world to enhance enjoyment. Chronologically, the story takes place around the same time as events in Book VIII, Bound by the Vampire Queen.

Nightfall (Vampire Queen #11)
Ranch owner Quinn Pedraza has to find someone to run the saloon he won in a bet, but more than that, he needs a woman who can handle his alpha personality…and closet submissive sexual cravings. When vampire Selene Torres arrives on the scene, he gets everything he wants – and learns what he really needs.

Elusive Hero (Vampire Queen #12)
Vampires drink blood, they’re superior to humans, and they’re sexual Dominants. Every vampire knows those truths. A vampire’s human servant is property, plaything, pawn--and the only living being a vampire can trust. Though she may own him, body, heart and soul, a human servant keeps a vampire from feeling alone in her dangerous, political world. But Kaela has a secret. She’s a vampire with a burning need to submit, to belong to a Master, and definitely not a vampire Master, who will use the advantage for political or emotional domination. But what kind of human male will consent to becoming a vampire’s servant, a 300 year life of utter servitude, to be her Master behind closed doors? An invitation to Eden offers her the chance to discover her elusive hero…and indulge the bliss of surrender.

Elusive Hero is part of the Invitation to Eden series and a book of the Vampire Queen series.