Moth

Charlie is crossing the Wastes with his best friend Hunter and Hunter's monster boyfriend Edin when a stop at a raider camp turns into a rescue mission: the camp's leader, Cat, is locked in a prison where captives are made to fight humans and monsters, and Charlie has been inside it before. The rescue throws him together with Moth, a half-monster who can't stand him from the first look. Grumpy meets sunshine in a dark M/M monster romance, very explicit, happy ending.