Some time ago, I got the idea for a middle-grade fantasy story involving demons from the Swedish book series "Demondeckarna" (title means "Demon Detectives"). Some of the concepts in the book were interesting but the execution and writing was sub-par. The characters were bland and undeveloped...
I have this story idea that features demon-based races like succubi and incubi, but I've already run into some problems with the world building because, there isn't an inherent demon race already fastened into the world. So, naturally, I'm trying to 'force' a demon-type race to fit into my world...