Duke Demon Lord, I Think My Identity Is About to Be Exposed!

Synopsis

A musty smell hung in the air.
When I opened my eyes in the eerie atmosphere,
humans dressed in black were all prostrated on the floor, wailing.

“O great demon…!”
“Please descend upon this place!”

Great demon?
Descend where?

“Please accept this sacrifice and grant our wish!”

A wish? What wish?
Do I have to grant that wish if I want that woman?

But ‘I’ didn’t think long.
I opened my mouth wide and swallowed the woman in a single gulp.
And then—gulp—I swallowed her whole.

“Did His Grace truly defeat all of those monsters?
The rumors were true….”
“That many magical beasts… Truly a demon indeed….”

I ate the woman when no one was watching and pretended to be the duke.
So how did they find out?

“Tia, remember what I promised you.
I will never use your identity against you, never threaten you, never tell anyone.”
“Yes, it seems I’ve been waiting for Your Grace.
Truly, for countless ages… I have been waiting.”
“Isolic Yennier, as you commanded, I’ve been excommunicated.
Now that I’m no longer a holy knight… may I become Your Grace’s knight instead?”

Why are these men acting like this again?