The Keeper by Lynn Hagen

What would you do to save the man you love? For the Keeper, he would sacrifice the universe. Bitten by Morog, his first creation, the Keeper is dying. He isn’t sure how he ended up in the vet clinic, but when Trey walks into the exam room, he knows he’s found his mate. But he grows weaker by the day, depending heavily on Trey to keep him alive. When he bites his mate, the Keeper discovers that Trey’s blood just might be the key to his survival.

As far back as Trey could remember he’s had the most bizarre dreams. But lately, his dreams have turned apocalyptic. He sees the world ending, and there is nothing he can do to stop it. When Trey is kidnapped and forced to help a dying man who claims to be the creator of the universe, Trey isn’t sure what to believe. But the harder he fights against his attraction, the harder Trey falls for the one man who could destroy mankind.