Humanity was reaching its peak within its mechanical world when portals started to appear all around the world bringing forth both disaster and hope. Humans dubbed them fairies because they could not pronounce the real name of the species that offered them help. Some helped on their own accord while others demanded something in return for their powers. Those who accepted these powers were called freaks for how they were changed after making a contract with a fairy. Much like humans, these creatures were both good and bad some killed while others healed. As the mechanical world started to fill with mana and monsters started to appear. Mindless beasts became pawns to the dark faction while becoming obstacles to those that choose to fight against them.
This story is somewhat inspired by Magical Girls are the Best Toys. I highly recommend reading the story, it's one of the best GL and smut that I have ever read.
(Some disclaimers to keep in mind: physical and mental abuse, blackmail, mind control, extreme fetishes, death, gore, rape )