The Power of Two by Mychael Black, Shayne Carmichael
As a vampire Master, Dominic has been eyeing his old friend, Griffith for quite a well. But being a Master in his own right, Grif resisted the notion of Dominic controlling him in any way. With startling skill, Dominic sets out to change that refusal. He has his own deep interest in him, born of watching Grif's submission at the hand of another Master. Even though Dominic can't help but toy with his old friend, in truth, he wants him only an an equal. But how to convince Grif without letting his guard down is Dominic's biggest issue. Aware of some of that interest but not the reason for it, Grif has his own secret. His trust had been violated by his own vampire Master, and since that night, he's refused to let another dominate him. And he'd swore to himself that no one ever would.