The Death God by Holly Day

Drinking vampire blood saves lives, but it comes with a price.
A couple of months ago, Gregory Acklam gave his blood to one of the psychics living in his castle. Vampires don’t share their blood willingly since it creates a partial mate bond when they do, but Thanatos would’ve died if Gregory hadn’t intervened. The effects of a partial mate bond wear off after a couple of weeks, so how is it possible Gregory still feels drawn to Thanatos?
Thanatos Sage never asked anyone to save his life. It doesn’t mean he’s not grateful, but no one asked him. It feels unfair he should be punished for something he didn’t do, but months after it happened, Gregory still refuses to be in the same room as him.
It all changes when Gregory needs a fake boyfriend to bring to a werewolf event. Gregory goes from avoiding him to constantly being in his space. He claims they need to smell of each other to fool the werewolves into believing they’re a couple. Thanatos is surprised to realize he doesn’t mind playing the part of Gregory’s boyfriend, but shouldn’t they stop pretending now that they’ve met the werewolves?