A Sinner's Hellfire (Hazbin Hotel)

A new soul descends into hell, but among all others in humanity's history, this one feels... different.
To let everything burn is to let go of everything, to be free.
To the one who lost everything, it's a tragedy.
But to the monster who caused it, it's a fantasy.
Follow that monster on his journey in hell, watch as he shows hell what a true monster can do.
Overlords and Princes beware, for not even the forces above are safe from the eternal flame.

(HH/HB x OC)
DISCLAIMER: I do not own Hazbin Hotel/Helluva Boss, only the plot of this book and the characters/concepts original to it.
OP OCs/Overpowered Original Character
OOC/Mischaracterizations of certain characters due to a lack of experience in writing characters I didn't create.
-Hazbin Hotel & Helluva Boss belong to Vivienne Medrano/VivziePop and Prime Video.-
TW: Mention and description of darker themes, a lot of swearing and explicit sexual content.