The Demon King Of Hounouji Academy (male Muzan reader x Kill la Kill)

A thousand years before the beginning of the samurai peoples story
Before the invention of Demon Slayers gonna pay, gonna be sorry
Before his life would become a movie, both bloody and as gorey
Diagnosed with a mysterious illness, killing him and killing him slowly
He finds a professional doctor who knew this was something he could achieve
Used the mysterious Blue Spider Lily to try to treat the disease
And it wasn't like the patient could not afford to pay all of the fees
He simply a highly skilled medic who's qualified to provide for the needs
He's an egomaniac who has no time for progress that is decent
So he kills the doc out of impatience for the process of the cutting edge treatment
Even though his body is in shambles, you can see that he really does need it
It is not that he wants to suffer, it's just the perspective that he sees it

I'm the one that you just can't see
Bad to bone, bad to the marrow
The progenitor I be
Welcome to the road not narrow
Just run when you do see me
Better aim more straight than an arrow
All my enemies will flee
Darker than a moonlight shadow