Forbidden! Exorcist Roommate by Hawke Oakley

Demon possession is the worst birthday gift ever.

Drunk frat boys always suck. Especially when they accidentally summon a demon at Chase’s birthday party that chooses him as its next host.
When Chase wakes up the next morning, he’s possessed. Not by just any demon, either—by the terrible and infamous Faust, who’s as flamboyant as he is annoying.
Desperate to evict the sassy demon, Chase seeks the help of an exorcist who’s never failed. Sagitta is skilled, serious, and smoking hot… when he’s not scowling at Chase.
But the exorcism is a disaster, and Faust’s still kicking. And begging to eat every sugary treat in the vicinity.
When the two men move in together to banish Faust from Chase’s body, they forge a connection neither expected. But Faust did. And he’ll do everything in his demonic power to make them finally kiss