It involves monster hunters (I think they're religious, not sure), one of them can read minds I believe. He may be sleeping with the leader. The dynamic is weird/toxic.
There was a part of the story where the killed a family of werewolves and the mind reader pointed out the kids to the rest of the group/killers.
I thought it was by the same author as "Heartless" (an incubus yaoi) but I didn't see it under the author's other work section. I did read this monster hunter yaoi around the time I read Heartless though.
Thwy have similar styles and they fall into the short fucked up horror/supernatural yaoi category.
Why is everyone surprised? It's clear the ml has issues understanding normal human interaction. I feel like we've been building up to this the entire time. The mc was just able to talk him down most of the time.
This was just the "last straw" and his full psycho seme came out. Let's see if he can be tamed once again I guess.