Arcius

The demon sits on the throne, remembering all the punishments he inflicted on the boy and working through them in his head

• I once tortured a soul in hell. And like a glorious masochist, he demanded punishment.

-Burn me! Freeze me! Cut me!

• I did so, it went on for centuries until one day, I missed the daily punishments,
  and when I returned he cried.

• Please, my King! Don't forget about me again! I promise... I'll be good!

tears just flow and he cries

"And then I realized he hated himself so much, disrespected himself so much, that no matter how cruel I was, it didn't matter. Just a tiny bit of my attention gave meaning to his meaningless existence..."

then he gets up and goes to his victim to take him and sit on the throne again. Break him, and perhaps even more.