Sabito's Little Sister

Combine

Your ear twitched and you held Tanjiro by his haori. "Uzu-chan."

Just as you said that, Uzui appeared next to Tanjiro. "Hey, isn't this Nezuko Kamado? She's flamboyantly progressing into a demon." He squinted his eyes. "You made such a huge show in front of Oyakata-sama, and this is how it turns out?"

"A pillar came from that direction?" The demon said. "This saves me the trouble."

"So annoying." Uzui began. "I'm talking over here, buzz off." Your eyes widened as you barely saw Uzui cut off the demon's head while her guard wasn't up. But something was... different.

"You're not an upper moon. You're too weak."

You noticed Tanjiro's amazed expression and put your hand on his shoulder. "Wait..." He looked at you curiously, then back at the decapitated demon, who wasn't disappearing. "For now, focus on putting Nezuko to sleep." You recommended. "Sing a lullaby or something."

Once you finished that sentence, Nezuko kicked off the floor and they both went flying out the window.

"Uzu-chan." You stopped him from leaving and pointed at the demon, who was still yelling empty threats.

"How dare you cut my head off?! You'll pay for this!"

He scoffed. "You still grumbling over there? I've got no business with you, so just die plainly."

You furrowed your brows. She wasn't disappearing like other demons when their head are cut off by a Nichirin Blade, and she did have the number engraved on her eyeball. Upper Moon 6.

She continued to claim that she was Upper Moon 6, and she doesn't seem to be lying from what you could hear. "Uzu-chan, I think-" "MY HEAD GOT CUT OFF! IT GOT CUT OOFFF!! ONII-CHAN!"

You instinctively stepped back and held onto Uzui's bicep. "What... is coming out of her back..?" He ran forward, trying to cut off... whatever boy was coming out of the demon's back before it could come out entirely.

When the dust cleared, the two were now in a different part of the room. "Crying's not gonna help." The boy said. "At least attach your own head yourself. You're really lacking in the brains department, huh."

Well, she wasn't lying when she said 'Onii-chan'. He's acting like mine. You held the handle of your sword and glanced out the window. Nezuko was asleep in Tanjiro's lap, so they were safe.

Your head snapped back in the room once you heard Uzui push off the ground again, but the thing that came out of the sash demon's back dodged once more --- or rather attacked.

"Heh, not bad." It complimented. "You stopped my attack there. And I struck with the intent to kill, too. Nice man. Nice..." He scratched at his face. "Nice face... nice skin, no spots, no birthmarks, no wounds."

It hunched down. "Nice flesh. I can't get any fatter myself." You tilted his head. Isn't that an insult? "And you're real tall, man. You're clearly over six feet here."

Then it looked at you. "Popular with the girls..." You cringed. Boy, no.

"The envy, oh the envy. Could you just drop dead? And you'll get a real painful death now. I'll skin you alive and claw your innards out right after."

He took out two sickle. "I'll kill anyone who tries to bully my sister. Time to collect the debts. I'll collect one for every bruise they put on you. I'll make you spin round and round when you die. Because my name's Gyuutarou!"

"Isn't that a manager?" You asked Uzui. He nodded, but quickly ran in front of you to protect you from the slashes of Gyuutarou's blades. "Uzu-chan!" You put your hand over his wound, and you unsheathed your sword.