*Rin is a demon that lives in Gehenna and is the king of Darkness and Shadows*
The exorcists are killing and being more brutal than normal towards demons and the Royal Family is sick of it and decides to take action all while the exorcist think it's a good idea to try out their new device that's supposed to open the Gehenna Gate. With this new device they want to try and capture a demon to pry out any information that they can, but instead of a regular demon- they unknowingly capture Satan's most powerful son. When Rin is brought to Assiah he come to find one odd looking human that intrigues him.
Shiro's alive and everyone is already an exorcist. There's more of an explanation in the chapters, these changes will just will help the story go smother.
~A Blue Exorcist fan fiction - Bon x Rin
~Fanfiction - I'll only take credit for the writing
(Warning: Mild swearing included)
!!BEING REWRITTEN!