At the following day after returning from Rapha’s house, Recycling Box spat out the error.
It was in a second after Lydia put in winter clothes, that she no longer needed, into Recycling Box.
The Recycling Box was a machine that disintegrated unnecessary items at the molecular level and completely vanishing them from the world.
The energy generated with disintegration could be stored up to fixed amount.

“What is it?”

Lydia tilted her head while verifying tiny display on the Recycling Box.
It showed:『The energy container is full』.

“Waah, I see it’s full for the first time.”

Lydia happily ran to call Yuuyami.
Yuuyami was placing the books, which Lydia had thrown around, on shelves.
Lydia always leave the books at the spot where she read it.

“Listen, Yuuyami, Resabo1 got an error.”
“What kind of error is it?”

Yuuyami asked, during finishing with the books.

“The energy container is full!”
“Is that so. Then we shall replace the Energy Pack.”
“Uh-huh. And what about a full one?”
“What shall we do?”

Last book was returned to the shelf, and Yuuyami turned towards Lydia.

“I want to use it for something, since this is such a rare occasion.”
“That’s right. I wonder what we can use the power for.”

That said, energy for library was ample, thanks to the solar panels, that Yuuyami had previously installed.
Yuuyami put her index finger on her chin and groaned with hmーm.
Pondering Yuuyami was cute, Lydia thought.

“Power now doesn’t particularly needed.”

Lydia slightly shrugged her shoulders.

“That’s right. We are content with it now.”
“Ah, then, let’s create something new? Something that would constantly use Energy Packs. How about it?”
“I suppose it’s good. This is safe, since there’s no utility for it, at the moment. What are you going to produce?”
“Well, there was a one thing I wanted to reproduce before.”
“Yes. What was it?”
“A bath!”
“Bath…” Yuuyami looking up her database. “It appears, that there are numerous of types, which bath would you like to reproduce?”
“Er, an ordinary.”
“How is it, ordinary?”
“A bath, which was common in households before popularisation of an air showers.”
“The facility equipped with a shower and bathtub?”
“Right, right, that one. However, there also must be a sound system and illumination. Ah, and aqua jet also!”
“You are well-informed​.”

Yuuyami smiled sweetly.

“Uh-huh. I was thinking about creating it some day, so I investigated it briefly.”
“Understood. Then, we shall produce a bath. Where you’d like to construct it?”
“Let’s slightly wreck a rest area of the library?”
“…eh?”

Yuuyami shoot her eyes open.

“I can’t?”
“Er…r. Wreck… the rest… area?”
“I can’t?”

Lydia looked at Yuuyami with moist pupils.

“Well, there’s no particularly, any users…”
“Alright, then there is no problem! Decided!”

Three days later.
Lydia’s long-awaited bathroom was completed, and the two, without a delay, were taking a bath.
In a steam, two of them were immersed in the bathtub. Lydia leaned her back on Yuuyami’s bosom, and placed her buttocks​ on Yuuyami’s thighs.
The sound system was playing swing jazz.
The two entwined their fingers of right hands under the hot water.

“Will it be welded?”

Lydia joked, when put all her might in right hand.

“What are you doing?”
“Right hand. I’ve put a lot of strength into it now.”
“I see.”
“Hey, will it weld?”
“It’s a lovely proposal, but it’s appears to be not pragmatic​.”

Yuuyami denied it seriously.

“I guess so as well.”

Lydia raised her left hand and touched Yuuyami’s cheek. The act has no deep meaning. That was so natural as breathing, Lydia touched the cheek of Yuuyami, gently caressed it, and then returned her left hand to its original position.
Lydia was happy to be wrapped by the warmth of hot water and softness of Yuuyami.
Regarding of happiness.
For Lydia, no matter where nor in which situation she will be, she would be happy so long as Yuuyami was there.
Even if she bound to die in ten seconds, if she was able to spend the last ten seconds with Yuuyami, she would die with pleasure.
And if that came true, she wished to pass away together.
To live together, and to die together. From the beginning until the end, they should be together.

“Ah, that’s right, Yuuyami.”
“What is it?”
“Could you wash hair.”
“Do you want me to wash my hair?”
“It’s different. Yuuyami, could you wash my hair.”
“Then hair washing subroutine…”
“Stop it. Yuuyami has a learning ability, you can learn it by practice, without creating a subroutine, right?”
“Yes. That’s right, however I shall to do it properly, right from the beginning, aren’t I?”
“Still, no.”
“Why so?”
“I want you to wash it now.”
“I see. Understood. I shall attempt.”
“Then, I’ll come out at once.”

Lydia got out of bathtub, and sat down in petan on the tiles.
Yuuyami also come out of bathtub and began to shower Lydia’s hair.
When Lydia’s blond got properly wet, Yuuyami spilled a shampoo on her hand.
The shampoo was reproduced by a simple Chemical Maker. There were four simple Makers in library, one of them was a simple Chemical Maker.
The remaining three were: a simple Food Maker, simple Dress Maker and simple Parts Maker.
Incidentally, there was one more simple Parts Maker in the garage.
Yuuyami put both of her hands on Lydia’s head, and exaggeratedly uttered: “Well then, here I go.”

“Alriight.”

Lydia closed her eyes.
Slosh-slosh2, Yuuyami moved both hands as in time when she stroked it.
Lydia judged, that she was quite skilled for the first time.
The manner, Yuuyami was doing it, comfortable enough.
For the time being, Lydia entrusted her body to that comfort.

“Perfect.” Says Yuuyami. “I was able to perfectly accomplish washing.”
“Is that so. Thank you.”
“The pleasure is mine. Now, I wash it off.”

Yuuyami showered Lydia’s hair once again. The foam flowed down altogether​, and Yuuyami exhaled relievedly.

“Well then, following is the body?”

Lydia snapped her eyes open.

“Please, leave it to me. I feel like I’m able do it.”

Yuuyami spilled body soap on both of her hands and rubbed it together several times.
After that, she began to wash Lydia’s neck, shoulders, then reverse in the order.

“Tickliiish.”

Lydia curled up.

“Pardon me. I may done it overly hastily. I shall do it more slowly from now on.”

Yuuyami changed the manner.
She washed Lydia’s arms, breasts and abdomen.

“Somehow, this time, it feels, strangely​ good…”
“I wanted for you to feel good.”

Yuuyami showed a smile.
Lydia turned around and embraced Yuuyami.

“What happened? I still haven’t finished yet?”
“I know. But, somewhat, that…”
“Yes. What’s wrong?”

Yuuyami tilted her head.

“I have a mood to create a child.”
“A child? Without a male, Lydia aren’t able to have a child?”
“Yuuyami, so, I ought to have a young male to produce a child?”
“I would hate it.”

An immediate answer.

“If so, don’t say such a things.”
“Excuse me. However, I have accurate information…”
“I know. Yuuyami, I received proper sex education, right? Therefore, I aware.”
“That’s right.”
“I want to marry Yuuyami and create a child with Yuuyami.”
“Are you making a proposal now?”
“Right! I am!”
“Thank you very much. Let’s get married, however I’m not able to impregnate my partner?”
“I’m aware of that either. Consequently, let’s create an AD? A very elaborate one, in order for consciousness to dwell in her. Make it the same as Yuuyami, or even better.”
“I see. I think this is a great idea.”

As long as she would be conscious, she will be an intelligent life-form. She wouldn’t be organic. However, that a trivial matter.

“Nevertheless, I don’t want to skip the process.”
“The process?”
“A sexual intercourse​.”
“Aah. That one. So Lydia was horny.”
“Yuーuーyaーmiー.” Lydia separated from Yuuyami. “If you guessed, you don’t have to utter it.”
“That’s right. I’m sorry.”
“Again…”

Lydia sighed.

“That said, however there’s a problem. I can’t participate in sexual act right now.”
“Uh-huh, it’s okay. I’ll wait. Wit until you heart would be ready.”
“It’s different. Not a question of the heart.”
“Ah, that’s right. Yuuyami is so smooth.”

Said Lydia, observing Yuuyami’s body.

“That’s it.”
“Understood. Then I will wait for a while.”
“No, if you wish, I can prepare it by tonight.”
“Mmーmm.” Lydia shook her head. “There’s no need to rush. One of these days, such as today! At the day, that appeared to be such as today, alright?”
“Understood. So I shall arrange it by tomorrow, in order for one of these days.”
“Uh-huh. Well then, let’s continue washing?”
“Understood. I will wash carefully, so that Lydia wouldn’t get lustful.”
“You don’t have to say it, so malicious!”
“Fufu.” Yuuyami giggled.
“Again…” Lydia puffed her cheeks.

Yuuyami finished washing Lydia, and the two were immersed in a bathtub once again.
They were in the similar position as at beginning. Lydia leaned her back on Yuuyami’s chest, and Yuuyami’s thighs were used as cushions for her hips.
The only difference now, that Lydia shroud a towel around her head, so that to prevent her hair from being soaked in hot water.

“We have to think about name for the child.” Said Lydia.
“That’s right. However, I guess it shall be only after accomplishment​. Or, perhaps, I allow you to choose it.”
“Right. Until that time, a tentative name can be a fifth generation of AD, C Series.”
“What is C stands for?”
“Child.”3
“I see. Will it be the fifth generation AD, C Series, Type Ⅰ?”
“I’m not sure I ever produce a Type Ⅱ.”
“Somehow, just now I recalled a time before I became Yuuyami.”

Fourth generation of an AD, LM Series, Type Ⅱ. That was the model of Yuuyami. Simultaneously​, it was her name. For Yuuyami that name was unnecessary.
Yuuyami hugged Lydia tightly from behind.

“Yuuyami?”
“I’m got used to this name, truly, I’m glad to be Yuuyami.”
“What’s wrong?”
“I thought I would always live alone. All alone in this decaying world.”
“Yuuyami…”
“But the Lydia was in this world. She gave me the name.”

Lydia was quietly listening to Yuuyami’s words.

“Perhaps, supposing​ I had a lacrimal gland, I would be crying. However fortunately, I don’t possess this feature. Even after this,​ I don’t intend to install​ it as well. I’m able to see appearance of Lydia with my visual sensor, I don’t want to distort it with something like that.”
“Hey, listen. I’m also glad to be Lydia. Yuuyami educated me, I came to understand a large number of thingsー”

Lydia entwined her fingers of right hand with Yuuyami’s and squeezed it tightly.

“Together, we can go anywhere, we can be anything.”

Lydia closed her eyes and imagined. Exploration of every corner in that decaying world. And afterwards, rebuilding it into a beautiful and tender world.
Everything around was
truly like in a dream.
Therefore, Lydia, in the decaying world, wished
she could watch a lovely dream with Yuuyami, that would last for eternity.

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