Give you some blood?

In the simple, slightly cramped, yet very warm little thatched cottage, Uta served tea to Muzan and Yoriichi. She then sat down beside them, her large belly resting against Yoriichi.

Muzan: Burp~

Seeing his son had "taken" his cabbage, and had even taken the cabbage on a "runaway" adventure, Muzan, though he already knew, couldn't help but feel a pang of heartache seeing Uta's swollen belly.

He directly slapped Yoriichi on the head:

"For laying hands on Uta!"

Though Yoriichi didn't feel any pain, he still flinched.

Uta smiled and then asked, confused, "What exactly happened?"

Muzan couldn't be bothered to explain and glanced at Yoriichi, gesturing for him to tell her.

Yoriichi then recounted the whole story to Uta, who nodded:

"So, Yoriichi, have you and Lord Muzan become demons now?"

"Yes."

Yoriichi, feeling a bit worried, hugged Uta from behind.

Muzan glared at him and then looked at Uta, saying:

"How about I give you some of my blood too?"

"No," Uta shook her head, "I don't want to become a demon."

Muzan pressed, "Because demons need to eat people and fear the sun?"

"Mm," Uta nodded.

"Then you can rest assured!" Muzan laughed, "The Blue Spider Lily has been found. We no longer need to eat people and don't fear the sun."

After speaking, Muzan looked at Uta expectantly, his meaning clear: Come on! Let's all become demons!

Unexpectedly, Uta shook her head again: "No, thank you."

"Why?!"

Muzan immediately asked, unable to understand. Wasn't this equivalent to eternal life? Why would she refuse?

Did she look down on demons?!

Uta explained:

"I just want to spend my life peacefully with Yoriichi, living together with him."

As she spoke, she gazed tenderly at Yoriichi, a gentle and contented smile gracing her lips.

Muzan was speechless for a moment. Damn it!

Slap!

Muzan slapped Yoriichi again, glared at him, and stood up:

"Go live your little life together!"

Yoriichi rubbed his head, gave an awkward laugh, and somewhat sheepishly watched Muzan disappear.

Four years later, The people who had been arranged to live near Yoriichi's home had already left. The small clearing in the forest was now inhabited only by the families of Yoriichi and Tanki.

Almost all demons no longer feared the sun, either by consuming the Blue Spider Lily or by receiving blood from Muzan.

Yoriichi was still living a warm life with Uta. Muzan would occasionally visit, bringing small snacks or other items. Tsugikuni Michikatsu, with Yoriichi's recovery, no longer felt threatened.

The mere Demon Slayer Corps posed no threat to him!

He began to wander, studying swordsmanship, and even helped Muzan by incidentally slaying any Half-Demons he encountered.

He became a renowned wandering samurai.

One day, Tsugikuni Michikatsu arrived near Yoriichi's home.

Under the golden sunset, he saw three houses standing quietly on the flat ground, the sunlight glinting off their roofs. He noticed Uta sitting under the eaves, diligently sewing something with her head bowed. Beside her, a strange woman was also sewing.

Two small children were playing in front of them.

His footsteps startled them. The two children stopped their play, and along with the gazes of their mothers, they looked over.

Uta's expression turned surprised, then she stood up, waved at Michikatsu with a smile, and shouted:

"Michikatsu—"

Tsugikuni Michikatsu was invited into the house. He took a sip of tea, set down his cup, and asked Uta:

"Where is Yoriichi?"

Uta sat opposite him, looking out the window towards the forest as if she could see Yoriichi's figure. With a smile, she said:

"He went to chop firewood. He'll be back tonight, it should be soon. Why don't you stay for dinner too?"

"Alright, thank you for the hospitality."

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That night, as Yoriichi shoveled food into his mouth, he overheard Kokushibo say:

"I recently heard that those who awaken the Scarlet Traces all die before the age of 25. You were the first to awaken them, so I wanted to ask if there's any way to live past 25."

Uta, who had just sat down, looked at Yoriichi at the words, then worriedly at Kokushibo.

Yoriichi frowned and shook his head, "I don't know either, but perhaps we could ask Muzan."

Kokushibo looked at Yoriichi, "Can you contact him?"

Kokushibo hadn't seen Muzan much in recent years; he had been busy improving his swordsmanship and could no longer contact Nakime.

"Muzan can sense my thoughts, but he might not necessarily pay attention..."

Before he could finish speaking, a figure suddenly appeared before them:

"Yo? You were looking for me?"

The three of them: "..."

Tsugikuni Kokushibo couldn't help but retort, "You, the great Demon King, come whenever you're called?"

"Hey, is it wrong for me to care about my son?"

Yoriichi: "..."

Fine, it was fine to just call him over.

Kokushibo was about to get to the main point, but was interrupted by Muzan again.

Muzan pulled over a small stool, sat on it, and said, "There's no real way to live past 25. The Scarlet Traces are like borrowing power from heaven with your lifespan, like a candle, burning yourself out."

Tsugikuni Kokushibo's face fell at the words, "Is there really no way?"

Muzan shrugged, "How about I give you some of my blood?"

Tsugikuni Kokushibo's expression was a bit conflicted, but thinking that Yoriichi had already become a demon, he absolutely couldn't die before Yoriichi. He instantly made up his mind and nodded decisively, "Give me blood."

Muzan: He knew it!

Yoriichi had become a demon, how could Tsugikuni Kokushibo refuse to become one?

"Fine."

To prevent Tsugikuni Kokushibo from rolling on the ground in pain and messing up Yoriichi's small home, Muzan whisked Kokushibo away to the Infinity Castle.

As soon as Kokushibo stepped onto the wooden floor, he saw Muzan poke a finger into his head.

Pain!!!!

Muzan ignored Kokushibo's contorted face from the pain, leisurely withdrew his finger, and watched Tsugikuni Kokushibo writhe on the ground.

But what Muzan couldn't understand was why, after Tsugikuni Kokushibo became a demon, he grew four extra eyes.

Muzan watched as four eyes sprouted on his face, it was so strange...

And he could tell that even though Tsugikuni Kokushibo had grown six eyes, he adapted almost instantly, as if it were the most natural thing in the world.

At the same time, countless blades emerged from his body, his veins bulged, and he let out low, pained roars from his throat.

Nakime was used to this, calmly practicing her biwa.

A moment later, Tsugikuni Kokushibo finally endured it, the blades that had emerged from his body retracted, and he looked at Muzan with lingering fear, "Can you not poke my head..."

"I'll do as I please. Now hurry up and change your clothes."

Muzan said, tossing him a set of clothes.

Tsugikuni Kokushibo's clothes were now tattered from being poked, with some parts exposed.

He took the clothes, looked down at himself, his expression unchanged, and took Muzan's clothes to a room to change. He emerged after getting dressed.

Muzan smiled, "You've become a demon, shall I give you a name?"

Tsugikuni Kokushibo looked at him expressionlessly, "There's no need."

"You'll be Kokushibo from now on," Muzan said to himself.

Tsugikuni Kokushibo: "..."

"Your situation is different from Yoriichi's," Muzan explained, hearing Kokushibo's inner thoughts and confusion. "Yoriichi is still living his life with his wife, so why change his name? But you've run away from home and are solely pursuing the martial path. It wouldn't be very fitting to keep the Tsugikuni Family name, would it?"

Tsugikuni Kokushibo, now Kokushibo, didn't really care and stopped thinking about it. He nodded, feeling there was a sliver of logic to it.

He then thought about his upcoming travels and, considering that three pairs of eyes might cause trouble, Kokushibo disguised himself as a normal human.

If that Scum Boss can change from male to female, then for me, Kokushibo, hiding my eyes is a piece of cake.