Caim doesn't talk about the time before his Fall, when he was one of the many angels that served God. He does remember how painful it was, to Fall and be born anew. At first, he took to his newfound status fairly quickly once he adjusted to his life as a demon, and quickly rose among the ranks of Hell. But eventually, things just stopped being interesting. It got boring to be summoned to read a future that could just as likely not happen as it could, or to sweet-talk some general's war horses to becoming more loyal to their masters than they already were, willing to die for them when self-preservation would normally take over.

After a few centuries, maybe even a millennia (it all blended together after a while, unfortunately), Caim was sick of it all. He wanted out. But it wasn't easy for a demon to leave Hell, or at least without being summoned in some capacity.

But if nothing else, Caim was stubborn. And so he studied. And started making preparations any time he was summoned, to anchor himself to the mortal plane more and more until one day, after completing a contract, he didn't feel the usual pull. He could freely move along in the human world. Utilizing some charms and talismans that he had stockpiled, he was able to suppress his aura and powers, passing as human. He's currently settled down in a small apartment, working as a veterinarian. A subtle nod to his powers, perhaps, but he did generally prefer the company of animals over people.