constantinehellblazer:

Updated: 07 November, 2015
A compilation of Hellblazer/Hogwarts fan fictions recommended by followers:

Hellblazer: Hogwarts by Camwyn (note: dead fic, but really well written)
“Sometimes, life bashes you upside the head with a brick in a sock. Hogwarts is about to get its latest Defense Against the Dark Arts teacher, a man cast adrift from his native world- a man named John Constantine.” 

Professor Constantine of Hogwarts School of Witchcraft and Wizardry by Flakingnapstich
“The Battle for Hogwarts is long over, the school mostly rebuilt. Hermione Granger is returning to school for her seventh and final year as a Hogwarts student. Today is her first defense Against the Dark Arts class, taught by the first Muggle professor in Hogwarts history, John Constantine.”

The Laughing Professor by Captain-Emily (one-shot, complete)
“Is Hogwarts really ready for the cynical, foul-mouthed, chain-smoking Professor John Constantine?”