Nobita, quickly use your invincible treasure bag to think of a solution!

The woman held a stirring stick in her right hand and placed her left hand on an evaporating dish. As she clenched her left fist, blood dripped from the palm of her palm and fell into the black liquid with a strong fishy smell in the evaporating dish. Under the stained blood, the black liquid continued to turn red, and the fishy smell gradually turned into a sweet smell. At the same time, with the woman's constant stirring and the heating of the alcohol lamp below, the red liquid gradually turned into a deep purple, and the sweet smell became a medicinal fragrance.

When the color in the evaporating dish no longer changed and only the purest purple remained, and the entire room was filled with only the strange medicinal fragrance, the woman took off the mask on her face, revealing the face of Tamayo.

Tamayo looked the same as before, with gentle eyes like a lavender mist, and rosy lips that contrasted sharply with her pale face. She exuded a strong maternal aura, gentle and peaceful.

"The 187th experiment of the human transformation drug. This one should be successful."

Tamayo's eyes were full of anticipation for the medicine in front of her, and she firmly believed that the adjusted medicine would be successful.

In the two months since coming to the Butterfly House, Tamayo and the girl named Shinobu have been conducting research together in the first month. There are two research directions, one is a human transformation drug that can transform evil spirits into humans, and the other is an aging drug that can make evil spirits weak.

In the following month, Tamayo and Shinobu conducted research separately, one on a drug for turning people into humans, and the other on a drug for making aging. As time was running out and a war was imminent, the two sides had no time to conduct joint research and could only conduct research separately. At the same time, Yushiro would pass on the research data of both parties and provide each other with suggestions for revisions.

After a month, Shinobu's aging drug has shown some results. The next step is to strengthen the effect of the aging drug. No matter how strong the effect of the aging drug is, it will not be enough to deal with the Ghost King.

On the other hand, Tamayo's human-transforming medicine has not yet produced any results.

In fact, Tamayo had been researching human-transforming medicine a long time ago. Especially after getting the support of demon blood obtained by Tanjiro and others, the research progress was also rapid. At least, there was no problem in allowing the passerby in Asakusa who was accidentally injured by Muzan to regain his sanity and get rid of the control of instinct.

In order to get rid of Muzan's control, Tamayo conducted countless experiments on herself before she finally broke free from his control. However, Tamayo's method is not replicable. In addition, Tamayo and her friends have been avoiding the Demon Slayer Corps and the Demon King. Over the years, Tamayo's research has not made much progress. It was not until the arrival of Nobita and Tanjiro that Tamayo was able to advance her research rapidly.

For more than a month, Tamayo studied Nezuko's blood, as well as the blood of demons such as Kanae, and finally decided to use Nezuko's blood as the material for replicating the human-transforming drug. The reason why the blood of other demons that could overcome the sunlight was not used was because Tamayo discovered that those demons had special changes, or evolutions, in their bodies. After removing the mysterious factors hidden in their blood, they were just ordinary evil demons.

Only Nezuko, only Nezuko is special. Only she really relies on the body of a ghost to overcome the sunlight little by little, and gradually regain her sanity from the evil ghost's bloodthirsty instinct.

In short, after more than one hundred and nearly two hundred drug experiments, and after sacrificing countless supplies, the Demon Slayer Corps' supplies were finally used up, and the Demon Slayer Corps no longer had any evil spirits to use as material.

And as expected, Diewu's address has been exposed.

This is why time is running out. Muzan can monitor the evil spirits born from his bloodline, and the fact that Tamayo and the others capture and experiment on ghosts cannot be concealed at all.

As for why Muzan did not launch an attack for such a long time, either he thought the Butterfly House was not as important as the lord's mansion, or Muzan was also waiting for the result, or Muzan had other plans. In short, it is certain that there is not much time left for the Demon Slayer Corps.

After consuming all the materials, Tamayo finally started working on herself. She chose to use herself as experimental material.

Tamayo held the rubber tube in her mouth and tied it to her arm using her hands and mouth. She then picked up the syringe containing the human-transforming drug, aimed it at her blood vessels, and prepared to inject the purple drug into her body.

After witnessing the changes in many experimental materials, Zhu Shi was mentally prepared for the possible changes that might occur after the injection of drugs.

In this month, she had seen too many cases of failed experiments, such as a ghost whose blood vessels bulged after being injected with drugs, and then whose whole body sprayed blood;

A ghost whose head swells up rapidly like a balloon and finally explodes;

After the injection, the ghost was normal, but after five minutes, his skin ulcerated, he lost his intelligence, and finally turned into a flesh-and-blood monster.

There are also ghosts whose ghost blood concentration in their bodies soars after being injected with drugs, and even reaches the level of Twelve Ghost Moons;

……

There are too many cases of failure. If the Butterfly House was not the place second only to the lord's mansion and had not a swordsman of the first level of the Pillar stationed there, it would have been completely destroyed long ago.

Now, without experimental materials, Tamayo can only conduct experiments on herself. At least now she is very confident about this version of the human-transforming drug, and even if there are any adverse reactions, she can tear her arm off in time.

For a ghost, a broken arm is just a minor injury that is not worth mentioning.

Just as Tamayo found the vein, picked up the syringe and was about to give herself an injection, the door suddenly opened and Yushiro walked in with a tray.

"Master Tamayo, it's time to eat."

Yushiro walked in from outside holding a small bowl of human blood in his hand.

Tamayo, who broke free from Muzan's control, and Yushiro, who was born from Tamayo's bloodline, are two demons whose desire for blood is not that strong, but they also need to replenish blood in time, and at the latest they need to replenish human blood once every three days. The price of not deliberately pursuing human blood is that Tamayo and the others' fighting power is far inferior to that of ordinary evil spirits.

Yushiro was holding blood ready to give to Tamayo, but as soon as he entered the room, he saw Tamayo trying to inject herself with drugs, which frightened him so much that he screamed, "No, Lady Tamayo, you can't do this!"

The tray in his hand fell to the ground along with blood, and Yushiro hurriedly ran to Tamayo to snatch the medicine.

As Tamayo's assistant, Yushiro has seen countless cases of failed experiments. He is still frightened when he thinks of the monsters that appeared after those failed experiments, so Yushiro will never allow Lord Tamayo to become a monster like that.

Yushiro stepped forward quickly, snatched the medicine from Tamayo's hand, and said, "No, Master Tamayo, how can you use your own body to conduct experiments? If you want to conduct experiments, you should use demons captured by humans in the Demon Slayer Corps."

Seeing Yushiro's concern for her, Tamayo's eyes softened and she said with a loving tone, "Don't be silly, Yushiro. You know, Muzan and his army of evil spirits have retreated to their base. There are no evil spirits left outside. Now I am the only one left for the experiment."

"That won't do either, Master Tamayo. I will never allow any problem to occur to your body!"

Yushiro held the syringe tightly in his hand and didn't want to give it to Tamayo at all.

Tamayo felt very complicated as she looked at the young man in front of her who had been with her for many years, was loyal to her and depended on her.

She understands his intention!

How could she not know what he was thinking?

But she couldn't and wouldn't accept his feelings.

Tamayo knew that she was deeply sinful. She was seriously ill and the doctor could not cure her. In order to continue to accompany her husband and son, she was bewitched by Muzan and agreed to his deal. She became a ghost, killed her husband, and harmed her son. Later, she went crazy, gave up on herself, and hurt many innocent people. She was responsible for too many lives, and she had to go to hell to atone for her sins.

Even though she has been curing illnesses and saving lives since then, her merits and demerits cannot offset each other, and she still has to atone for her sins.

Tamayo was very happy to see Nobita again, to see that he was living a good life, and to have many beauties. Apart from destroying Muzan, she had no regrets.

The only thing I feel sorry for is my feelings towards Yushiro.

She understood, she understood Yushiro's feelings for her, but it was precisely because she understood that she could not accept it.

She was an unfaithful woman who killed her husband and had an affair with her son... and also developed feelings for Yushiro, who was like a son to her. She had committed a serious sin.

And since Yushiro has never killed anyone, he can survive.

Tamayo stretched out her hand and asked for the potion: "Be good, Yushiro, give me the potion. This is my only wish in all these years of life. Give it to me."

"No, absolutely not. I will not let Master Tamayo get hurt in the slightest. I won't allow it!"

Yushiro held the medicine tightly in his hand, pretending to refuse.

"We are out of experimental materials. Do we have to use you for the experiment? Yushiro, I understand your feelings, but I cannot accept you. At least, I cannot accept you before I have redeemed my sins in hell. If I can be reincarnated after redeeming my sins, I can... Anyway, if you really love me, give me the potion."

Tamayo's words were cruel, but she didn't say anything absolute, and she still left Yushiro with a little hope.

"Okay then..." Yushiro looked frustrated. He could hear Tamayo's determination.

She wants to die together with Muzan!

After spending so many years together, he could understand Lord Tamayo's thoughts.

Just as Yushiro was about to hand over the potion, he hesitated for a moment, then suddenly realized: "Wait, what about Nobita? What will Nobita do? Are you going to abandon him too? Will you tell him your decision?"

When Tamayo heard Yushiro mention Nobita, her heart softened for a moment, but then her expression turned cold and she reached out to grab it: "Give it to me!"

Yushiro resisted desperately: "No!"

"Give me!"

"No!"

"Here...Yushiro, what's wrong with you?"

During the scramble, Tamayo suddenly noticed that Yushiro's expression was wrong, and his body seemed to have lost strength and went limp.

When Yushiro's hands were released, Tamayo discovered that during the struggle, the needle had pierced Yushiro's chest, and under Yushiro's pressure, all the medicine inside was injected into Yushiro's heart.

"Uh... Lord Tamayo..."

Yushiro's expression froze on his face and he slowly fell into Tamayo's arms.

"Yushiro, Yushiro, how are you? Yushiro!"

Tamayo hugged Yushiro's body, at a loss. She couldn't even think of any way to save Yushiro.

One of the characteristics of the human-transforming drug is that it must take effect quickly, otherwise there is no way to turn Muzan into a human. If it does not take effect in time, given Muzan's personality, he is likely to choose to sacrifice part of his body and survive like a gecko by cutting off his tail.

So when the medicine was injected into Yushiro's body, Tamayo knew that everything that happened next would depend on Yushiro himself.

And Yushiro lay in Tamayo's arms, feeling Tamayo's warm embrace and smelling Tamayo's scent. He had never felt so satisfied.

"Ah, if only the diary was here, I could write something in it."

Feeling his consciousness being gradually drained away by an unknown force, Yushiro felt that it was a pity that he could not continue to feel what he was feeling.

Then Yushiro found that everything in front of his eyes was dark and his consciousness was sinking.

……

After an unknown amount of time, Yushiro opened his eyes and found a familiar light in front of him. He was still in the basement, with Lord Tamayo waiting anxiously beside him.

Did Lady Tamayo cry?

Is she crying for me?

Then I am so lucky!

As a bootlicker, seeing the goddess crying for him is like a dog encountering a huge beef bone, or like a beggar winning a lottery of five million. It makes him so happy that he wants to cry.

What Yushiro didn't understand was why Lord Tamayo's next words were so incomprehensible?

After the injection of the medicine, Yushiro felt weak all over, as if he had not eaten blood for several days. He was extremely weak. With the help of Lord Tamayo, he reluctantly sat up.

After sitting up, Yushiro clearly felt that his chest was strange and heavy, as if two super big meat buns were stuffed in it.

Just when Yushiro wanted to check if there were two big bumps on his chest, Tamayo stopped his hand.

Tamayo looked at Yushiro with a strange expression, but her tone was still gentle, comforting him: "Listen, Yushiro, what's coming next may be difficult for you to understand, but don't panic, this side effect may only be temporary, don't be lost, don't be depressed, and don't have any bad thoughts, okay?"

Although Lady Tamayo's voice was very gentle, like the most beautiful song in the world, Yushiro still noticed something was wrong.

His hair is a little too long!

But it's just that the hair is longer, there's no need for Lord Tamayo to react so strongly, right?

"Master Tamayo, don't worry, I...my voice!"

Yushiro was about to persuade Tamayo to be at ease when he suddenly reached for his throat.

Something is wrong!

His voice is wrong!

It didn't sound like his previous voice, but rather like the voice of a strange girl!

Tamayo grabbed Yushiro's wrist and persuaded him, "This is what I want to say, Yushiro, you need to calm down first. This side effect may be temporary, you..."

At this moment, Yushiro was no longer as excited as before because of touching Lady Tamayo's hand, or rather, he no longer had the ability to get excited!

"Calm down? Lord Tamayo, how can you ask me to calm down? How can I calm down when I'm like this?"

Yushiro's hand stroked his throat and rested on his chest.

Bu Ni Bu Ni!

Xuan Ruan's touch was like a thunderclap, exploding in Yushiro's mind.

Yushiro was shocked and reached his hand under the quilt...

Boom!

a bolt from the blue!

Gone!

It’s really gone!

Not at all!

Not only is it not protruding, it's even sunken!

"Do not!!!"

Yu Shi Niang let out a shrill scream, climbed up from the ground, and ran outside with a terrified expression.

"Wait, Yushiro, don't run, come back!"

Tamayo hurriedly followed Yushiro, wanting to bring back this boy...girl who had followed her for decades and turned from a boy into a mother.

It was noon outside and the sun was shining brightly. Yushiro would be sunburned to death if he ran out.

However, Yushi Niang, whose emotions were on the verge of collapse, simply could not listen to the words of Tamayo who was chasing after her.

She only knew one thing: she was no longer a man.

There is no chance to fulfill the appointment with Lord Tamayo in the next life!

Deng Deng Deng!

Yu Shi Niang ran barefoot in the basement, her goal was very clear, which was the door leading to the outside.

Although Tamayo is a demon, after she transformed herself, her physical strength is far inferior to that of a normal demon. Her physical strength is only at the level of ordinary people. Only her self-healing ability and blood demon technique are the same as those of a demon.

Therefore, it was not easy for Tamayo to stop Yushi-niang from running away.