The Child of Darkness (Demon Slayer Role-Swap AU x OC)

Muzan Kibutsuji

Tocho's P.O.V

The two-horn opened up his jacket and said, "I dunno, but if there is an accessory here that belongs to her, then I've already eaten her."

I heard Kazumi give out a sharp intake of breath, and then he collapsed onto his knees.

He lamented his dead fiancee and cried for a while.

I gritted my teeth, "You know, you could've just not said anything."

"I prefer telling the truth."

"If everyone tells the truth, then the whole world would be in chaos."

"That's precisely what I like."

"You're sick." I growled.

"You're not too different."

That line made me mad, "I'm not too different?! At least I care about people! I'm not a heartless monster like the rest of you!"

I charged the two-horn, Tanjiro charging in with me.

I slashed at the demon's shoulders, anticipating him to duck down, and managed to slice his jaw open.

Tanjiro took that chance to grab the demon and drag him out of his little swamp portal.

I walked up to the demon and drove a sword through his chest, "Second form: Frozen Heart."

My sword caused ice to spread around the demon's entire body except for his head. It's pretty obvious now that about half of my moves are more for constricting purposes than killing.

"Now talk. What do you know of Muzan Kibutsuji?"

His eyes widened, and he started panicking, "No, no! Not him! Anyone but him! The Demon Lord will kill me if I say anything!"

"You'll die either way, so either speak and get a painless death, or remain silent and get painful torture." I growled.

He stubbornly kept his mouth shut.

I sighed, "Well, I guess we're doing this the hard way after all. Nezuko, take care of one-horn for me, will ya? Tanjiro, go with her."

Tanjiro nodded and bounded towards Nezuko, I turned my attention back to the demon.

I dragged my other blade across his neck, cutting deep into it but not quite killing him.

He howled in pain, just as I like it.

"You know, I can still stop this if you're willing to talk."

"I cannot say his name."

"Then don't."

"... Fine."

I grinned sadistically, and put my sword away, keeping the other embedded in his chest to freeze him in place.

"Start talking, then."

"The Demon Lord is a very... cunning one. He uses a lot of demons as his own tools to develop sunlight immunity, thus complete immortality."

"He can still be warded off by wisteria flowers and killed by Nichirin swords though."

"No-one would be able to get close to him."

I sighed, "If he wanted complete immortality, he should've talked with my family. My parents ingested demon blood before I was born, and now that he has turned me into a demon, my human mind still remains because I can resist the demon's calling. It's really too bad my family is dead, though."

That last line shocked him, "So... you're a complete immortal?"

"Yep, I can decapitate myself right here, right now, and I'd be fine. Observe." I drew my sword and used my own mercy-kill move on myself.