"After observing your blood just now, I found that its activity has increased."
"But, it's only a tiny bit."
Tamayo raised her hand, her thumb and forefinger curved, and Yoizumi, with his excellent eyesight, could clearly see that the gap between the two fingers was probably only wide enough for a single sheet of paper.
It really was just a tiny bit.
"Does that mean if I keep using my Blood Demon Art to break my limits, I'll get stronger and stronger?" Yoizumi asked, puzzled.
"Theoretically, yes, but I told you, you are the least suitable type to be a demon."
"So, don't expect to become incredibly strong," Tamayo said, gently swirling the crimson blood in the test tube, her light purple eyes looking at Yoizumi through the glass.
"As long as I can get stronger, right?" Yoizumi's calm tone was full of certainty.
As long as he could get stronger, even if it was just a tiny possibility, he would try. Facing powerful enemies, he couldn't stand still and do nothing to protect everything he cherished.
No matter the cost, he would do his best to protect it.
Yoizumi didn't want to lose anything again.
He hated the feeling of loss!
"Mr. Yushiro, I will assist you."
"For our common goal."
Since receiving Yoizumi's blood, Tamayo had worked day and night, never stopping her research on his blood.
If Yoizumi was the least suitable to be a demon, then Nezuko was the other extreme.
With only a small amount of Muzan's blood, Nezuko had perfectly integrated it into her body. Both were extremely special existences.
She couldn't imagine, if Nezuko had as much blood as Yoizumi, would she become another Muzan?
She had once combined Nezuko's blood and Yoizumi's blood, attempting to explore what changes would occur. The activity in Yoizumi's blood had indeed increased, but it was very unstable.
Tamayo was now fully focused on finding a breakthrough. As soon as she found an opening, with the appearance of an activity-enhancing agent, Yoizumi's strength would far surpass his current level.
Tamayo truthfully informed them of this, and Tanjirou, after hearing it, worriedly asked, "But, will there be any side effects?"
"I'm not sure about that. Only after it's successfully developed and Yoizumi tests it himself will we know. I understand the risk is great, and everything will be decided by you, Yoizumi," Tamayo said, looking at Yoizumi, who was deep in thought. In truth, she didn't think Yoizumi would refuse the offer.
"Yes, I accept." After a few seconds of thought, Yoizumi nodded in agreement. If it could indeed greatly increase his abilities, as Tamayo said, he was willing to bear a little risk.
Compared to unknown risks, he feared the loss of what he possessed even more.
It was still that same saying.
Endurance… that was what he was best at.
Tanjirou was still uneasy and wanted to persuade him, but when he saw his brother's resolute eyes, he knew that whatever he said would be useless.
Clenching his fists on his knees, he thought, "I have to become stronger!"
He couldn't let Yoizumi-nii get hurt again by falling into danger.
"It's settled then~ Yushiro." Tamayo smiled faintly and turned to call Yushiro.
Yushiro nodded. He understood Lady Tamayo best; even before she said anything, he already knew what she wanted.
His gaze fell on Yoizumi with sympathy, making Yoizumi uncomfortable.
Wait… this scene felt so familiar?
When Yushiro brought the familiar syringe, Yoizumi sighed, what must come, will come.
"Because the research requires more blood than I anticipated, I need a bit of blood from both Yoizumi and Nezuko." Tamayo held the syringe, its sharp needle glinting silver, her gentle tone combined with her graceful and virtuous appearance sent shivers down one's spine.
In any case, Tanjirou's face paled a few shades upon seeing the syringe.
Yoizumi-nii
Nezuko
It's okay!
Even if you both faint.
I'll be responsible for bringing you back!
Yoizumi resignedly raised his arm, feeling as if all the blood he had lost since leaving that dilapidated house could drown him… After drawing Nezuko's blood, seeing his sister obediently listen but with teary eyes, Yoizumi reached out and stroked Nezuko's head to comfort her.
Tanjirou, even more anxious, took out the konpeito.
"Nezuko! Here, have some candy."
Only when his sister felt better did Tanjirou finally relax a little.
"This much is enough. Give me some time; once the research is successful, I will have Chachamaru deliver it to you," Tamayo said.
"Meow~" Chachamaru, who was sprawled on Yoizumi's lap, lazily meowed.
"Will you be staying tonight? You must be very tired, aren't you?" Tamayo asked, carefully putting away the precious blood.
Stay overnight?!
Upon hearing this, Mr. Yushiro's eyes almost shot flames. Standing behind Tamayo, he glared fiercely at Tanjirou and Yoizumi.
No! No! No!
Go away!
If you dare to agree, you're dead!
Don't disturb his and Lady Tamayo's private world!
"Uh… probably not?" Tanjirou cautiously watched Mr. Yushiro's expression, feeling that if he agreed, something bad would happen.
Besides, he wanted to return to the Butterfly Mansion quickly and start training as soon as possible.
He wondered how Mr. Rengoku was recovering.
"Is that so? Well, alright then, I won't insist," Tamayo said with regret.
After Yoizumi and Nezuko returned to the wooden box, Tanjirou put it on his back and, after a brief tidying up, said,
"Goodbye, Miss Tamayo and Mr. Yushiro!"
"Mm." Tamayo smiled gently in response. Yushiro stood with his arms crossed, not looking at Tanjirou.
After Tanjirou left, Yushiro happily looked at Tamayo and asked,
"Lady Tamayo, is there anything you need my help with now?"
Tamayo picked up the box filled with blood and shook her head.
"Not for now. I want to go research immediately. I might be in the laboratory for a while."
"Because this is very complex, I need absolute quiet. Yushiro, don't come to the laboratory recently, understood?"
Upon hearing this, Yushiro froze in place, his heart collapsing.
He simply couldn't refuse Lady Tamayo's words.
After Lady Tamayo's figure disappeared from his sight, he could no longer hold himself together and immediately fell to his knees.
He wouldn't be able to see Lady Tamayo for a while?
No!
He would die if he couldn't see Lady Tamayo for even an hour!
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