Can you recommend some 'angel and demon fiction books'?

Sure. 'City of Bones' by Cassandra Clare has elements of angel - related fiction. It's about a girl who discovers she has a connection to a world of angels and demons. Another one is 'Angelfall' by Susan Ee, which is set in a post - apocalyptic world where angels have fallen to Earth and are causing chaos.

They often have a strong sense of duality. Angels usually represent good, order, and purity, while demons are associated with evil, chaos, and temptation. For example, in 'Good Omens', the angel Aziraphale and the demon Crowley are on opposite sides but also develop an unlikely friendship.

One great 'guardian angel fiction book' is 'The City of Ember' where the main characters seem to have a kind of guardian - like force guiding them in their journey through a post - apocalyptic world. Another is 'A Wrinkle in Time' which has elements of other - worldly beings that could be seen as guardian - like in their protection of the young protagonists.

Well, 'Fallen' by Lauren Kate is a well - known angel fiction. It tells the story of a girl who is drawn to a mysterious boy who turns out to be an angel. The story is filled with mystery and romance as it unfolds in a boarding school setting. Also, 'Angelfall' by Susan Ee is a post - apocalyptic angel story where the angels have turned against humanity, and it's a really exciting read.

One great angel science fiction book is 'The Fallen Angels' series. It has a really interesting take on angels in a science - fictional universe.

I'm not aware of many mainstream books that directly combine all three elements. However, some works of queer fiction might have elements that could be associated with angels in a more symbolic way. For instance, in some books that explore themes of redemption and transformation in the context of LGBTQ+ characters' lives, the concept of an angelic presence could be inferred.

One book could be 'The Angel in the Garage' by an unknown author. It might be a fictional take on the concept of an angel being associated with a garage in some mysterious or magical way.

Well, there's a story where an angel, who is tasked with maintaining order, meets a demon who loves chaos. At first, they are enemies, but as they interact more, they start to understand each other's perspectives. Their love is forbidden in their respective worlds, yet they can't help but be drawn to each other. It's a tale of two beings from opposite sides learning to love in the face of great opposition.

Another great 'angel and demon novel' is 'The Mortal Instruments' series. Although it mainly focuses on Shadowhunters, there are significant elements of angels and demons. Angels are the source of power for the Shadowhunters, and demons are their eternal foes. The series has a richly developed world full of magic, adventure, and complex relationships that are influenced by the presence of these celestial and infernal beings.

One example could be 'A Taste of Gold and Iron' which has elements that might be related to the idea of 'gay demon fiction' in a sense of having supernatural and queer elements combined in a fictional world.