S1 Muzan x mother reader (completed)

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"Sometime...in the next five days... Muzan and if we're lucky...his mother will also...come..." Ubuyashiki informs the rock hashira who sat beside his bandaged body.

"Muzan's mother? She's still alive?" Gyomei asks, in surprise to have the information.

Kaguya chuckled softly "It is quite... surprising, isn't it?" He tells him.

Himejima nods, "He is a merciless and ruthless demon after all..." He replied.

Kaguya shakes his head gently, "From our family's history...Muzan had lived...his 15 years... without a mother...his father...had kept his survival...secret. Due to his pride...He, h/n couldn't inform...Muzan's mother,Y/n" he spoke.

Gyomei tears fall, "How sad for Y/n-sama..." He muttered.

Ubuyashiki raised his hand, signalling that he wasn't done, "H/n had only informed...Y/n just before his death...which was when...Muzan had turned...15" he continued.

"...what was the cause of death?" The pillar asks, curious.

Ubuyashiki pauses, "He was killed by Y/n"

Gyomei's eyes widened, "Why--

"A mother's hatred is dangerous...Y/n was only...below 20's at the...time of her labour... she had not yet matured...hee mental mind had degraded...every day"

"How did Y/N-sama Not see Muzan, master?" He asked the frail man.

"After Y/N's labour...Muzan's heart had stopped a lot...of times...He was thought...to Not survive long... because of this...H/n gave Y/n back to...her family...despising the fact that...she gave to a such weak child..." Kaguya replied.

Gyomei frowned, " She has no control over how the baby will grow into. Was that really the best decision?" He fumed.

"Y/n...A Mother who gave birth in...such a young age...scarred...afraid of losing her son...*chuckle* but...You know what they say...Mother knows best" Ubuyashiki grinned.

Gyomei tilts his head,"What are you planning, Master?"

The door to the room slides open, revealing Amane and their two young daughters.

"Ah, Amane-san" Gyomei greeted, bowing slightly to the woman.

Amane nods back and sits to the other side Ubuyashiki, making them face Gyomei.

Kaguya turned to his wife, "Did you find it?" He asked.

Despite being curious, Gyomei did not ask.

Amane nods and turned the pillar.

"Since, you are blind. I will read it to you" The woman informed him.

Gyomei nods and waits. He hears a paper crunch under her touch.
"I wonder what it is..." He wondered.

Hearing her suck in air, he readied.

"I, Y/n Kibutsuji, the mother of Muzan Kibutsuji agrees on this peace treaty" Amane spoke clear and loud.

Gyomei's eyes widened, "Master?! But she is--

Kaguya presses a finger on his lips, " Calm down, my child. Amane isn't done yet"

The pillar bites his tongue and sits back, eager to listen once more.

Amane, noticing his eagerness, starts again. Her eyes turned to the paper again.

"I'm a mother of a murderer who had killed hundreds or thousands of humans. It is quite sickening to bear his wishes due to having this power"

"I do not blame him. As bad as that sounds, it is a mother's fault that her son has turned like this"

Gyomei frowned yet again, "I do not believe that it was Y/n-sama's fault though. The world sometimes don't revolve like that..." He thought.

"He's a nice and good child. But, he's fear on being untreated had affected his way of thinking. If the medicine we received did not have this effects. He would've lived a normal life as a human"

"A mother knows best. As much as I want to stop him, I cannot stop myself but to support him. A mother's love has no bounds. If the time of his death comes. I want to support you under wraps. It pains me to lie to him, but what he's doing is wrong."

"I know what's right and wrong. Despite living for a thousand of years, he only knows how to lead by fear"

"When you plan to kill him. I only beg of you to tie me or behead me. I will hold back my strength for you all to succeed"

"I only wish for you to win"

Gyomei turned to his master while Amane folded the paper and back into her sleeves.

"Are you sure that we can trust her, master?" He asked her. He pitied her but was still cautious.

"That was a treaty sign that was made by my family, it also a top secret. It is a treaty that is only valid if she did not harm one of our slayers" Kaguya answered him.

"...did she?"

"No. That alone is a proof of her underlying support. Even if someone stands by the enemies side, it doesn't mean she or he shares the same goal as who she or he serves" Ubuyashiki added.

The hashira nods, not having any choice but to trust his master's words.

"When the time comes...how would I know if she takes her words back?" He asked,

A fat silence happens before Kaguya smiles. "She won't, you'll be only agreeing to it fully once you see her wearing a necklace" he informed him.

"Necklace?" Gyomei questioned, curious as to why a single be place can change his view.

Ubuyashiki nods, "Hm. It is a necklace my ancestors gave her. Wearing it signifies her agreeing to the treaty. Muichiro even told us about her right? Same with Obanai, Tengen and Tanjiro."

"Even when Uzui and the others had the upper hand on the fight. She did not step in."

"When Tanjiro tried to kill her, she did not lay a hand on him and even acted motherly once the fight was over."

"Obanai chased her and had almost killed her, she only used her power to run away. Even helping them from being massacred by Nezuko"

"Muichiro persistently fought her and managed to stab her. She only knocked him out and assigned the lower ranks to escape before Muzan arrives"

Gyomei sat in silence, "...does that mean..."

"Yes, do not doubt and trust her" Kaguya requested.

The pillar gulps, "Maybe master see in my in one of his future glimpses" he thought.

The truth was, Kaguya didn't see it in his future premonitions. "All I can do is trust my instincts and hope that it'll all be alright" Kaguya thought.