Some time prior to story…
A woman who looked to be Lily, but with bright red, short hair, was looking at the full moon, while humming a tune to herself. As she hummed, a man approached her from behind.
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"You look to be lively as ever, even when you're sick." The man spoke.
"An illness such as this can't possibly…" The woman coughed harshly that it caused her throat to hurt. "Maybe, I should rest." She answered with a weak smile.
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Being helped into a futon, the woman laid down and looked at her caretaker.
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"I can't thank you enough, Tsunayoshi." The woman thanked the now named man Tsunayoshi.
"Of course. Anything for my precious wife…" Tsunayoshi spoke a name but it never registered in the woman's ear. "Afterall, you are my precious Spider Lily."
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Present Time…
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Slowly waking up from her slumber, Lily opened her eyes to see that Nezuko was nowhere to be seen. Opening the door slightly, she noticed both Tanjiro and her eating with Urokodaki. Seeing this, she shut the door and walked towards the window. Opening it slightly to allow a sliver of light to enter, she then placed her arm in it only to see it not burn. Sighing at the sight, Lily closed the window, and proceeded to placed herself under the futon's cover.
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"To think you gave me the one thing that man wants the most. Just where did you get such a thing, Tsunayoshi? Where did you get it, indeed?" Lily spoke to herself with a smile on her face before succumbing to the warmth of the blanket and falling asleep once again.
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Later that night…
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Doing the same routine, Lily began swinging the wooden sword, and Nezuko tried her best to dodge it. Of course, it ended with Nezuko becoming more bruised than the previous day.
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"Alright that's enough for today." Lily spoke up when she noticed Nezuko struggling to get up.
"No." Nezuko said as she struggled to her feet. "I can still go."
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Seeing her passion drive her actions, Lily smiled and told Nezuko one thing before continuing.
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"Listen, Nezuko. When it comes to frontal attacks, don't think about it, just move." Was all Lily said before rushing up.
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As she did, Nezuko prepared herself but still to dizzy from the previous assaults, Nezuko lost a little balance, only to feel something swing past her. Realizing this, the words Lily had told her finally begun to click. Not thinking of the attacks, Nezuko began to move her body, inch by inch. Step by step, moving away from the attack of the deadly blade. Seeing this, Lily became more impressed, she began to speed up the swings of the blade. Trying to keep up with Lily's speed, Nezuko continued her footwork and dodging, getting scratched and smacked ever so often, until the Nezuko ran out of breath and the blade was at her neck.
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"We've got to work on your breathing. But other than that, good job." Lily answered after bringing the blade down.
"Okay, so what's next?" Nezuko said as she sat down trying to catch her breath.
"Oh, I'm done. You're going to be learning from Urokodaki. And just note, he's going to be a lot tougher than I was." Lily smiled.
"Huh?" Nezuko questioned Lily's motives.
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But all Nezuko got as a response was a smile. A smile that seemed to be hiding a villainous attempt.
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The Next Day…
Under the tutelage of Urokadaki, Nezuko was being brought up to speed on the training that he had put Tanjiro in. Still seeing that there was time, Urokodaki walked back to his house. As he entered his house, he noticed Lily sitting in the corner of the shadowed room, sipping tea.
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"To think I'd see you again." Urokodaki said.
"What? Did you think your master will die that easily?" Lily said with a smug-like smile as she answered Urokodaki.
"No, I had faith you'd survive." Urokodaki answered.
"Still as short sentenced, I see." Lily replied as she looked at Urokodaki's red tengu mask. "You seem to have something on your mind, what is it?"
"Nezuko Kamado." Was all Urokodaki said.
"What about her? You know you have to be more specific." Lily answered.
"I have a letter stating that she was a demon. Just wished to know what happened." Urokodaki answered his former master.
"I simply gave her an antidote that reverses the effect of Kibutsuji's blood." Lily answered.
"Then, why not give it to the Demon Corps?" Urokodaki asked.
"Because, it will only reverse the effects of those who have recently turned into a demon. The time limit is 3 days." Lily answered before continuing to sip her tea. "And even if I did, they'd probably discard it. You should know how they feel about demons."
"I do. I'd just wish to see your thoughts, is all." Urokodaki responded.
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After a few moments of silence, the two just sat there and waited for both Tanjiro and Nezuko to return.
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Several Hours Later…
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Completely winded, tired and sore, both Tanjiro and Nezuko slept with a face that just screamed pain. And sitting next to them with a soft smile on her face, Lily placed her hands on both Tanjiro and Nezuko's and began soothing their heads to try and give them comfort. After several minutes, Lily turned her attention towards Kaguya, her other half. Still looking like that of an infant, Kaguya slept with a peaceful face, unaware of Lily's actions. Leaving the room after a few minutes, Lily was greeted by the smell of Urokodaki's cooking.
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"Still great a cooking I see." Lily spoke in a soft voice as to try not to wake the sleeping children.
"Mm." Was all Urokodaki said.
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Not liking the response, Lily began to pull on Urokodaki's left cheek. After a few minutes, Lily let go.
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"Can I ask for one more favor, Sakonji?" Lily asked.
"What?" Urokodaki answered.
"Can you watch the two Kamado siblings." As Lily said this, she lifted her knees up to her chest and wrapped her arms around, while laying her head on them. "I hate to be honest, but I'm getting old. I can't keep doing this."
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While Lily spoke, Urokodaki just listened.
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"And honestly, just watching the two of them had taken its toll on me. I'm afraid I don't exactly have the strength that I once had." Lily finished speaking to hear Urokodaki's response.
"That is the reason for Kaguya." Urokodaki responded.
"Yes." Lily answered. "Honestly, I've tried using my breaths, but in the end, I just coughed up a storm. If I'd tried anymore, I'd have to be relying on my demon blood."
"I see." Urokodaki said. "Your more human, and Kaguya's more of a demon. Then that means…"
"That's right. She is…" Lily spoke, but in Urokodaki's ears it was almost as if she never said a word.
"Do they know?" Urokodaki asked.
"They don't. And it's best that they don't." Lily replied. "And as long as she doesn't bleed, they won't find out."
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As Lily looked at the old man, she began to crawl towards him. She then placed her hand on his cheek, smiling sadly, causing a tear to roll down Urokodaki's face.
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"Can I see that face of yours, one last time?" Lily said as she placed both of her hand on Urokodaki's red tengu mask.
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Without responding, Urokodaki placed his hands on top of Lily's and moved his tengu mask up. Seeing the old man's face once again, caused Lily to smile brightly.
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"There he is." Lily answered. "My lost student."
"Mm." Urokodaki responded.