Demon Inside by H.L Day

The forces of darkness are gathering, and only two men can stand in their way.

Jude Campbell can see demons. His psychiatric history says it’s all in his head, but he knows they’re out there. Watching. Waiting. Biding their time.
Dante Moretti is the half demon child that should never have been born. He might exorcize demons, but the dark urges from his demon side are growing stronger, and he knows the day will come when he’ll lose himself to them completely.
When Jude’s time runs out, Dante is tasked with keeping him alive. Jude might be temptation personified, but for Jude’s sake, Dante won’t give in. Only, being together is changing them, in ways neither could possibly hope to understand, and it’s no longer clear who is saving who.
Destiny has come calling. And love could be its prize.

Demon Inside is a 94k action/adventure paranormal MM novel. It features a demon king who can enter dreams, two flawed main characters who don’t have the happiest of backgrounds, a priest sidekick, secrets that go way back, and plenty of steam.
Content warnings: violence and murder, past mentions of sexual assault (not of the main characters), and mentions of psychiatric difficulties and medication use.