Two mature women

"Please take care of my daughter, Sensei," Kie bowed her head at Tamayo. 

Tamayo wanted to say that she couldn't make a promise, but she watched how sincere, hopeful, and excited Kie was, and she couldn't bear to say those cruel words. At the same time, she looked at Isao, who had been silent and had never said anything. 

'He is a good son and a brother,' she thought. 

"Let me check her condition first," Tamayo said as she looked at Nezuko, who was different from any other demons that she had ever seen. 

Unlike a normal demon, Nezuko appeared like a child, and she didn't need blood or a human's flesh, which made Tamayo curious. 

Yet, this was normal since Isao had modified Nezuko's DNA slightly. 

Yes, Isao might be able to return Nezuko to humanity directly, but he didn't do it as he still wished to hide his ability. If he wished to, he could even modify her DNA into existence like him, who had the good parts of a demon without any bad parts of the demon. 

However, he didn't do that, and he was sure that many would say he was cruel since he had slept with Kie, the protagonist's mother, and also let Tanjiro join a dangerous job. But why didn't he do anything and help his stepdaughter? 

Yet, it was fine. 

He didn't mind people thinking that he was cruel since he was often misunderstood. His goodwill was almost misunderstood by many, and many thought of him as an evil man, but it didn't matter to him since, in the end, sooner or later, Nezuko would be cured, and it was all that mattered.

However, Nezuko's situation wasn't due to him; it was all due to time and a miracle. 

Yes, like a hero who didn't wish to be known when he helped others, Isao also wanted to be such an existence, helping Nezuko secretly without being noticed by others. 

In the beginning, Isao wanted to slowly heal Nezuki in a year, letting her return to a human naturally in the eyes of others, hiding the fact that he used his power to heal her. 

However, as he had met Tamayo, then he was going to let her take all the glory since, no matter what, his ability had to be kept a secret, at least for now. 

Still, he hardly used his third ability, which made him capable of modifying the DNA of others, bestowing a special trait, or giving them a defect, yet he had to say this was an amazing ability since if he wished, he could make anyone immortal like him. 

Nevertheless, the recovery of Nezuko was something absolute, and there was no need to worry, which also showed his care toward Kie, who had given her body to him. 

'As expected, I am a good person,' he thought. 

Still, if Tanjiro knew what Isao was thinking, even if he knew he would die, he would stab his katana at him! 

Yet, as Isao quietly thought about how good he was, Tamayo was surprised by Nezuko's blood, which was different from others. 

"She has never drunk blood or eaten flesh?" 

"Yes." Kie nodded, then asked worriedly, "Is there a problem with her, Sensei?" 

"No." Tamayo shook her head and said, "If it's another, I might not be able to confidently say this, but if it's your daughter, I believe that she can return to a human." 

"Re-Really?" Kie was pleasantly surprised. 

"Yes." Tamayo nodded with a gentle smile. She was also once a mother, so she somehow understood Kie's feelings. 

"That's great." Isao stood by Kie's side, patting her back softly. 

"Thank you, Isao-kun..." Kie looked at the man she loved with moist eyes and wanted to hug him, but there were many people, so she didn't dare to do it. Still, when they were alone, she was going to repay him well~!

Watching the happiness of the three, Tamayo and Yushiro somehow were affected, thinking that they had a good family. Still, at this moment, they thought that Isao was Nezuko's older brother and the son of Kie, but Isao wasn't going to solve their misunderstanding, so they brought Tamayo to another room. 

Naturally, Yushiro also followed since he couldn't let Isao and Tamayo stay together. 

"These are Muzan's arms and legs." 

While Isao had devoured all the parts of Muzan's body that he had cut previously, he could recreate Muzan's body parts due to the biokinesis ability he gained after he devoured Muzan's DNA. 

Anyway, he could create small animals with his own body, so creating Muzan's body parts was easy for him. 

"Mu-Muzan's arms and legs?!" 2x

Tamayo and Yushiro were dumbfounded. 

"Y-You are lying!" Yushiro couldn't believe it since he was almost told that Muzan was an invincible existence, and Tamayo had told him to avoid this demon king, so that was why they had been almost in hiding. 

"No, they are real!" 

However, Tamayo, who checked the body parts given by Isao, was dumbfounded since they were really Muzan's body parts! 

While Nezuko's blood was special, and there might be a chance of her recovery, Tamayo still needed Muzan's blood or the blood of those demons who had consumed a lot of Muzan's blood, like those Twelve Kizuki members. 

Twelve Kizuki members aside, Tamayo didn't think that Isao could get Muzan's arms and legs just like this! 

As expected, her guess was right, so Tamayo looked at Isao once again and asked with a hint of disbelief and expectation. "Ha-Have you fought Muzan?" 

"Yes." Isao nodded. "I almost killed him, but he escaped at the last moment." 

"Once again! That coward!" 

At that moment, Tamayo lost all of her composure and cursed Muzan cruelly, thinking what a coward Muzan was. 

"Ta-Tamayo-sama...?" Yushiro was dumbfounded when he saw the cruel side of Tamayo, but even so, this side of hers was still as beautiful as ever. 

"I-I am sorry for losing my composure." 

Tamayo took a deep breath and quickly calmed down, but her eyes changed when she looked at Isao since, once again, the chance of Muzan being defeated was right before her eyes. 

Her wish to avenge her dead family was before her! 

Tamayo wouldn't miss it, and she would do anything to support Isao. 

"With all of those, it should be possible for Nezuko to recover." 

"Thank you." 

"...." 2x

Thank you... those were simple words, but they had never thought that they would hear them from Isao's mouth, which made them understand how much he cared about Nezuko and Kie. 

"No, it's not a problem, but if you need our help to kill Muzan, then please tell us." 

"You don't need to. You are too weak." 

"....." 2x

It was their first time hearing such a refreshing rejection from Isao, but they couldn't refute him because they knew that they were too weak, especially before Isao. 

Frankly, Isao didn't expect much of Tamayo and Yushiro except to use them as a reason for Nezuko to be cured and return to become a human. Moreover, he had recorded their DNA, so they had no value in his eyes anymore. 

As for sleeping with Tamayo? 

Isao wasn't a demon or sexual deviant that would do something so evil! 

They had helped him to become his excuse, so at least he should treat them sincerely. Well, as long as they didn't mess around, though. 

Still, when everything was settled, Isao left Tokyo to go to Kagaya's house since Kagaya had called him. 

Yet, watching how easily Isao left Kie and Nezuko in their care caused Tamayo and Yushiro to lose their words. Did this guy believe them so much? No, it should have been because they were so weak that he didn't pay much attention to them, and the confidence that came from his strength made him believe that they didn't dare to do anything. 

Yushiro thought so, but Tamayo felt a unique feeling when Isao, the strongest man ever alive, could have such trust toward a demon and left his mother and little sister to their care. 

At the same time, having a connection with Isao was great, especially when he had a hospital, which allowed them to buy a blood bank with ease without the need to buy it from a living person as it was too dangerous and suspicious. 

Oh, Isao also gave them a fridge, which allowed them to keep their blood fresh for a long time, which made them even more grateful to him. 

"Your son is amazing." 

Tamayo couldn't help but say so when she was alone with Kie. Unlike Yushiro, who was crazy about her, Kie was a female and also a mother. Even if their age difference was about hundreds of years or so, it was easy for them to get close to each other as their status was similar. 

However, Kie blushed and lowered her head shyly when she heard Tamayo's words. "He-He isn't my son..." 

"Oh? Then he is the friend of your husband or son?" Tamayo asked innocently. 

"No-No..." While Kie was embarrassed, she answered her relationship with Isao truthfully. "He-He is my lover..." 

"..." 

Tamayo blinked her eyes, then asked curiously, "Re-Really?" 

"Um..." Kie nodded shyly. 

"..." 

Watching Kie, who was old enough to become Isao's mother, Tamayo had to say that Isao had a unique taste, but somehow, she became curious, and the two mothers talked excitedly to each other about many things Isao and Kie did, especially in Yokohama~!

Still, when the two mature women bonded together, Isao looked at Kagaya strangely and asked, "You want me to take care of your wife and children?" 

"...." 

Isao had to say Kagaya was a nutjob.