The brother was called Gyutaro. The sister, Ume.
Heard their deceased mother's surname was Shabana.
The siblings were born and raised in the pleasure district. Never left that street. Knew nothing of worldly affairs.
I explained to them the existence of demons. Clarified the difference between me and Muzan. And the changes appearing in their bodies.
Though they could normally live, couldn't touch sunlight anymore.
The siblings accepted it well.
"Just can't sunbathe. I don't like sunbathing either—makes you ugly."
Ume lay on my lap, speaking confidently. "People in the pleasure district work at night anyway. If just not sunbathing means living with Big Sister, I'd rather not have the sun."
Yes. Though I was already a thousand-year-old granny, I couldn't accept being called "lady."
Ume naturally changed to calling me Big Sister.
After her injuries healed, she became even prettier than her childhood appearance. Delicate yet flamboyant features. Like a gorgeous flower.
Taking care of Ume wasn't difficult. She loved delicious confections, exquisite jewelry, beautiful clothes. As long as she had these, every day was happy.
Though Gyutaro's appearance wasn't striking, he was more clever and intelligent than his sister. Could also understand what I was doing. And the relationship with the Demon Slayer Corps.
The Nine Pillars were still somewhat uneasy. When passing my home, always came to check on them.
Even if not spoken, Gyutaro obviously didn't like these people who'd nearly killed him and Ume. Even if justifiable, he didn't want to acknowledge them.
I wrote to the Ubuyashiki saying—tell them to stop wandering around my place. Annoying to watch.
The crows the Ubuyashiki raised seemed mutated. Each could speak human language. Message delivery speed much faster than before.
But I was active at night, dormant by day. Didn't receive a crow. Given to me was an owl. Heard they specially raised a whole family for me. Generations working for me.
After the letter was sent back, the Nine Pillars indeed rarely came again.
After they adapted to current life, I prepared to go out again, everywhere seeking trouble for Doma.
When I mentioned going out, Gyutaro said he'd also follow.
Seeing her brother wanted to go, Ume immediately clamored she'd go together too.
What sense was there in bringing kids when going out to fight?
I was very troubled. But Gyutaro was very perceptive. Immediately said again, "My lord, rest assured. I'll protect Ume well. Won't drag you down. Look—"
His nails sliced his palm. Blood surging out didn't fall to the ground. Instead solidified into form. Became two sickles.
Blood Demon Art. Don't know whether to call it his luck. Muzan transformed so many demons. Not every one possessed Blood Demon Art.
And my constitution differed from Muzan's. If only received my blood, usually had no special abilities.
But the Demon Slayer Corps researched with my blood for years. Successfully developed a special medicine targeting demons.
They distributed it to Corps members for use. As long as demons touched this medicine containing my blood, regeneration and reaction speed would greatly decrease. Demon hunting success rate further improved.
Also precisely because every year I had to provide large amounts of blood to the Demon Slayer Corps for medicine-making, my power naturally was also affected. The Ubuyashiki wouldn't let me fight on the front lines anymore. Lest I encounter danger.
But I insisted on troubling Doma. The Ubuyashiki didn't protest. Just loved writing letters nagging me—don't charge before Upper Rank demons alone. After finding clues, go together with Pillars.
He also loved bringing up old matters. Said his grandfather back then was so scared by me rashly charging into the Eternal Paradise Cult to face an Upper Rank demon that he developed high fever that night...
Sigh, sigh. After that, Grandfather's health wasn't good. Passed away at a young age... Though he could still hold on now, couldn't withstand the same shock.
Nonsense! When was the Ubuyashiki family's health ever good!
Back then, the Eternal Paradise Cult matter was clearly reported only after his fever broke. Don't think I don't know! I won't take this blame!
Getting off track. Anyway, I couldn't cultivate demons possessing Blood Demon Arts. Koyuki now lived in seclusion in towns where no one knew her. Lived peacefully. Also because she had no combat ability. Neither Akaza nor I wanted to drag her into these matters.
But Gyutaro and Ume seemed somewhat different.
Ume discovered her brother's blood could become weapons. Eyes suddenly widened. Cheeks puffed up angrily.
"Why can Brother do magic tricks, but I can't?"
She stared at me with wide eyes. Tone somewhat aggrieved. As if I favored her brother. Was unfair to her.
I'm wronged!
Gyutaro also sighed. "Stop fussing, Ume. This has nothing to do with my lord. Besides, how do you know you can't without trying?"
Ume thought about it. Found it very reasonable. She changed new clothes and matched new jewelry happily every day. Indeed hadn't properly studied her body's changes.
But to be like Gyutaro—cut a gash in her palm to let blood flow out—Ume hesitated.
She nestled beside me, sat down. Voice soft and wheedling. "Would being cut by a knife hurt a lot, Big Sister?"
Even if wounds healed quickly, it still hurt quite a bit.
Remembering she'd been tied up before, nearly burned to death—I heartachingly held her. Gently patted her back, coaxing. "Then no need to try. Ume not having Blood Demon Art is also fine."
Ume leaned in my arms. Smiled at her brother.
Gyutaro seemed to roll his eyes. "Fine. Then you stay home and guard the house. I'll go out with my lord."
Ume shot up. Furious. "Why! Brother, don't you dare leave me behind and go out with Big Sister!"
She grabbed the small fruit knife on the table. Viciously slashed her hand.
Ah, not afraid of pain anymore?
I wanted to speak but hesitated. Looked at this one. Then that one.
Gyutaro winked at me. Then dragged out a lazy tone to instruct his clumsy sister.
"Right, concentrate. Idiot, not telling you to hold your breath! Imagine the feeling of controlling blood..."
Gyutaro's explanation was quite vivid and understandable. After Ume tried for a while, the blood surging out became ribbons in her hands. Could move freely at her will.
She smugly commanded ribbons to fly before Gyutaro and twist. The latter raised his blood sickles and shook them. Scared her into immediately shrinking back.
One was sickles. The other, ribbons? Very fitting for their sibling personalities.
Since they possessed Blood Demon Arts and were willing to fight, I started teaching them combat techniques.
Breathing Styles belonged to the Demon Slayer Corps. I couldn't privately transmit them. Moreover, they needed to coordinate using Blood Demon Arts in battle. Originally unsuited for human swordsmanship.
I simply tailored training according to their characteristics.
The two learned very quickly. Before long, already figured out a combat method suitable for themselves.
The first year I turned them into demons, the siblings together beheaded a Lower Rank demon. From then on became unofficial members of the Demon Slayer Corps.
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