Bite Darkest by Lynn Hagen

Fynn Lumet was caught in his worst nightmare. He’d been taken off the street and thrown in a cage where men tried to convert him into a mindless monster. A bloodthirsty rogue vampire. After escaping, Fynn found himself in another dilemma. He was marched into a basement by his mate, locked away to rot. But he finds his chance to escape, and takes it, only to run into the biggest threat of them all. His unquenchable thirst.

Ayden Peak wanted Fynn dead, until he discovered that the vampire was his mate. Now he must find a balance between feeding Fynn and overdosing him on blood. When Fynn’s family plays a deadly game, determined to either kill Fynn or convert him, Ayden has reached his breaking point. He goes after Fynn’s family, only to find himself trapped with no way out. Now it’s up to Fynn to save Ayden, but at what cost?