A workshop in Chaldea.
No, it was a space that should be called a laboratory rather than a workshop.
"Oh my, what brings you here?"
Chaldea's laboratory. A place where countless inhumane experiments, including human experimentation, had been conducted.
Now, thanks to the current director, Olga Marie, it was a place where the traces of experiments conducted by the former director, Marisbury, could not be confirmed except through documents or virtual information.
In that very place was BB, dressed as a nurse. Kiyohime, Atalante, and Jeanne had come to see her.
"Because it's one of the most suspicious places in Chaldea. I just didn't expect to find you here."
BB chuckled at Jeanne's words. The most suspicious place. A fair point.
"Did you know? I've heard Chaldea conducted various experiments not only within Chaldea itself but also at a genetic facility called Seraphix. Do you have any idea how many Master candidates were sent as test subjects to the facility, also known as SERAPH?"
BB smiled and displayed the information she knew on a screen she created in mid-air.
Seraphix.
One of Chaldea's sources of funding, a genetic facility that also surveyed the Earth's ley lines by studying its brainwaves.
Even when Marisbury was alive, they had recruited numerous Master candidates besides the A-Team.
Mages from families of a level that the Animusphere sphere could handle even if they were tampered with or disappeared, or Masters from ordinary backgrounds.
Those with an aptitude for being a Master and for Rayshifting due to their Magic Circuits were sent to Seraphix for experiments. They were used as sacrifices for countless tests.
One of these was a facility called the Celestial Observation Room.
A staggering 128 Coffins for 128 Masters. Unlike in Chaldea, corpses could be placed inside. The corpse of an aptitude holder to serve as the Master.
Since the Coffin was for proving existence, it didn't matter if the being inside was alive or dead, as long as it had Rayshift aptitude. Therefore, as long as they had Magic Circuits (Master aptitude), they could summon a Servant over and over again using that corpse.
Moreover, since it was a system that could summon 128 Servants repeatedly using corpses, it was at a level where even Divine Spirits could be summoned.
All for the grand purpose of Chaldea.
"2980th session, synchronizing with unit 115."
"..."
"Judged non-revivable. Automatic disposal. Final report. 120 units preserved, 88 units disposed of. Requesting test subjects of B-Team candidate level or higher. This is the last report from Seraphix."
"They were doing something like that?"
Atalante looked extremely surprised to hear this for the first time, which was only natural. For them, the events related to Seraphix in 2030 had never happened, so there was no way they would know about the facility's affairs.
The truth about the SERAPH incident and Seraphix was known only to a very few.
Atalante and Jeanne were horrified by Chaldea's unbelievable atrocities, but Kiyohime just stared at BB with a sullen expression.
"So, what of it?"
"Oh?"
"I don't care what happens to any human other than my husband. Even if it's the people of Chaldea, or even Ms. Mash. As long as my husband is safe, it has nothing to do with me."
"Wow~ An Evil alignment, as expected? What a bold answer."
Was it because she was the only one of the three with an Evil alignment? Or was it because she had seen the filth of the world so many times? As long as Sho was fine, she couldn't care less.
"To put it simply, Chaldea has many facilities for conducting such experiments. This place is one of them. Aren't you curious about what can be done with humans?"
"Are you saying you're going to experiment?"
At Jeanne's words, BB wagged her index finger and smiled. She showed them a small box in front of her. Inside the glass case was a single mouse.
"I try not to conduct human experiments, if I can help it."
BB's words sounded like she would do it if given the chance. As Jeanne frowned, she pulled out a syringe.
"What's in that?"
"Senpai's semen."
For a moment, Atalante wasn't sure if she had heard correctly. Jeanne's face flushed bright red, and Kiyohime's eyes widened as she stared at the white liquid inside the syringe.
"Senpai's thick, rich semen♡ Ms. Atalante, Ms. Jeanne, haven't you experienced firsthand what kind of world this is? Sexual corruption and turning into a nympho."
BB chuckled, tapping the syringe. Atalante's expression hardened, and Jeanne lowered her head in shame.
"Is this that world correction from those ero-doujinshi?"
"That's right. Originally, Senpai was fated not to receive the correction, but I made a few adjustments. A cheat, so to speak. Now, Senpai is also a protagonist of that correction. And at the center of it all is this very semen."
"What do you mean, my husband's semen is at the center of it?"
"Wait, don't tell me it's that?"
Atalante, who had memories of this world's Atalante being corrupted by Ryuuji, was startled by the possibility she had just thought of, her face turning serious. But as they say, seeing is believing.
BB immediately reached into the case, grabbed the mouse, and stuck the syringe in.
"This mouse is a female. Would you like to see how a female changes?"
BB injected Sho's semen into the female mouse. A moment later, not even a minute had passed before the mouse began to squirm, showing clear signs of being in heat.
"Is it an aphrodisiac?"
BB scoffed at Jeanne's question. This was no mere aphrodisiac. Nor was it a heat-inducing drug.
"It has an aphrodisiac effect, but that's just a bonus."
BB said, showing a picture of Sho to the mouse. The mouse immediately pressed itself against the glass case, scratching at it as if trying to get out.
"The bodily fluids of those who receive this world's correction, including Senpai, are very special. Just touching it can have an aphrodisiac effect, but those who have it injected into their bodies become fanatically devoted to the subject. As you can see, even a mouse that has never even seen his face instinctively recognizes its master."
"Then, is that why the me from this world became like that?"
"Yes. While it's true that the women of this world are easily corrupted, it's not so easy for them to be corrupted by men who don't receive the correction. It's a power held by a special few men, like Ryuuji and Senpai. No, I suppose it doesn't have to be a man. There's a possibility a woman could have it too. I've never seen it, but you never know what variables might appear."
Kiyohime was puzzled by the word "variables." BB continued her explanation.
"A Servant would need to be injected at least once or twice. Atalante, you weren't taken down in one go, were you?"
"Strictly speaking, it wasn't me, but she was probably done in a few times."
"Yes. There are individual differences. Most Servants won't fall in one go, but there are those who do, and those who take dozens of times to be broken."
BB had assumed that those who had resisted quite a bit in the previous timeline, like Kiyohime and Jeanne, had strong minds, and she was right. it was due to a combination of factors like mental strength and constitution, but individual differences clearly existed.
"However, I proposed a hypothesis and ran some calculations. What if? How long would it take to conquer and overwrite someone who has already been conquered by another? There's a possibility that it's not entirely impossible. But? I've calculated that it would take several, even tens of times longer."
"The reason you're telling us this must be because it's related to this experiment."
"Correct, Ms. Kiyohime. As you all know, the women of this world are far too weak-willed. Asking a complete stranger to get them pregnant, for instance."
Jeanne flinched at those words. It was the doing of a Jeanne who was her and yet not her, but since it was still Jeanne d'Arc's deed, it struck a nerve.
"So I came up with a plan. If we make these easy women into Senpai's women, then we'll be safe, at least for the first phase."
"...Wait a minute. Ms. BB, don't tell me?"
Kiyohime had a suspicion at BB's words, and the AI just beamed at her.
"Yes. I've already secretly inoculated the women of Chaldea with Senpai's semen. That includes Gran Cavallo, too. Ms. Mash and the Director have been directly injected and have also drunk it from Senpai every day, but I gave them an extra dose. And of course, I did it to myself too♡"
As she spoke, BB took another syringe filled with Sho's semen and injected it into her own neck. As his semen entered her body, BB smiled with an ecstatic expression, her body trembling with pleasure.
"Haa~♡ This is my drug. Well, it's not really necessary for me or Senpai. But there's no harm in being careful, right? Besides, this body of ours is only temporary, and I'd hate for it to be defiled. Plus, it feels good!"
"Wait, um. Does it have to be semen? We're Heroic Spirits, so it's probably fine for us, but is it okay for Mash and the Director? For semen to be in their bloodstream."
"It's fine. Normally, semen contains proteins, cells, and enzymes that don't exist in the blood, so injecting it into the bloodstream would cause a severe immune reaction, sepsis, blood clots, or even death. But? This world is fucking special. I tested it, and there were no problems at all. Even I can't logically explain why."
Normally, it would be an obviously dangerous act, but in this world, it was possible.
If Asclepius or Nightingale saw this, they would probably call her insane and try to crack her head open.
"Anyway, the reason I'm doing this is for safety. And for Senpai's sake, as well. So, would you all be willing to be inoculated, just in case?"
"Honestly, I like the Master, but isn't this going a bit too far? It's kind of creepy."
Being injected with *that*, of all things. Atalante naturally expressed her revulsion.
"What about you, Ms. Jeanne? Your little sister has already been inoculated, you know."
"!? Wh-what have you done to my little sister?"
BB had secretly inoculated her while extracting the Holy Grail.
"You know, right? She could end up like Ms. Atalante if we're not careful. This is a vaccination to prevent that, you see? Weren't you planning on seducing Senpai later while getting all lovey-dovey with your self-proclaimed little sister?"
Jeanne, her face turning beet red as if BB had hit a nerve, couldn't retort. BB giggled at her and tossed them syringes.
"It's up to you whether you do it or not. But this is a chance to get even closer to Senpai, you know? I don't think it'll have a huge effect on you all. It's literally just a vaccination. The choice is yours."
BB smiled as she gave them the syringes, and Kiyohime immediately uncapped one and drank its contents.
"It is my husband's, so I will not refuse. However, I would prefer his blood over his semen."
"…Is that so. Well, if you prefer blood. I'll draw some for you later under the pretext of an examination."
"Thank you."
Kiyohime just drank it, worried that Sho might be disgusted if he found out later. The other two glanced at each other and also just ended up drinking it.
"Good thing we didn't bring Ms. Yu Miaoyi."
"She would have thrown a fit if she knew. Asking what in the world we were proposing. It's a good thing she went to play games with Siegfried."
"Ah, right. She said she was going to have a revenge match with her husband after losing to Ms. Krimhild in a game."
"Anyway, that's all I have to explain. Feel free to look around the lab some more, but Ms. Jeanne? Your little sister has probably gone to find Senpai by now."
BB said with a smile in her eyes, and Jeanne bolted out of the room. Kiyohime and Atalante sighed, watching her back with sour expressions.
Meanwhile, in Sho's room.
Sho, who was resting in bed with Ritsuka and the Director, was surprised to see Jeanne Alter, who had come to his room.
"You, what's with your clothes?"
"That woman told me this is what modern clothes look like and made me wear it."
BB had sent her dressed in extremely revealing clothes. It's a secret that she had resisted the urge to put her in the Dangerous Beast outfit.
"Wow, a nympho."
"Y-you came to seduce him, didn't you! I know it! You found out Sho is the most important Master in Chaldea and came to seduce him! Don't be fooled! She's the femme fatale type!"
"I get it, so calm down, Director."
Sho had a feeling that this was going to be a very long night.
The fact that her older sister came crashing through the door a moment later was just a bonus.
Originally, she had intended to stop her, saying it was too soon, but seeing Jeanne Alter in such a revealing outfit... a screw in her head came completely loose.
What happened to Sho in that room that night... one can probably guess easily.
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