Soifon gave Kisuke a fed-up expression and said, "Why would I give you a chance to experiment on me? That's equivalent to throwing my life away. I know I owe you, but I'm not ready to leave this world yet."
Kisuke was about to refute her words but stopped himself just as he opened his mouth, 'I can't blame her for thinking like that , can I?' He thought back to what he did when he was still in this world, 'I'm only a bit better than Kurotsuchi-san because I actually ask for permission.'
In the middle of his thoughts, Soifon continued, "If you know why then give it up."
Kisuke stayed silent for a few moments to think how he should go about this. It's the research that he had been developing for almost a decade now so its importance to him couldn't be expressed with just a few words. And while he could ask and trick any Shinigami or Arrancar to join him, getting ahold of someone on Soifon's level just isn't really realistic.
"Soifon-san." Kisuke suddenly addressed Soifon which made her jump slightly.
"What?"
"It seems that your senses have still not adapted to this place, but take a closer look at me. Examine me closely like how you would do in your stealth missions."
Soifon wanted to smack his head but fought off the urge and just did as he said, 'What is he trying to say...? ...!?' As she noticed the strange anomaly, her thoughts started trailing off. Soifon hurriedly stood up and walked around Kisuke, trying to confirm what she was actually seeing, "You... Do you have a physical body? It's indeed very well made, but why are you trying to show off your Gigai?"
While muttering, her attention briefly landed on his clothing, 'Wait... Shihakushou?'
At that moment, realization dawned on her and she walked around Kisuke with wide-open eyes, "Did you have this Gigai on when we fought?"
Kisuke shook his head and Soifon sighed in relief. If she was correct, that would be extremely weird and would open various possibilities, good and bad in the Human World.
While Fullbringers and Quincies can use their Spiritual Power despite having a physical body, their organizations aren't large enough to cause a sizable ripple in the Human World, 'Except for that one Fullbringer with the support of the disgraced Tsunayashiro Clan.'
"I'm not wearing a Gigai. Not yesterday and not now." Kisuke continued.
Soifon looked at him strangely, "Did you give it a new name after changing a few bits of its features or production?"
Kisuke smirked at her and said, "Please don't look away from reality."
Soifon froze for a bit before returning to her seat, "...How?"
"It has something to do with the place both Yoruichi and I ended up with after the war. If you agree to become an experimental subject, along with an oath of secrecy, I will tell you everything about it."
Soifon became more hesitant before shaking her head, "No."
She already knew that she wouldn't be able to leave this place without restricting her ability to reveal the information about them, that's a given and she was trying to know more about them so that she could at least negotiate the terms, 'If he's willing to reveal their hidden story, it could lead me to more useful information and actually figure out the origin of their Magic Power.'
Nonetheless, that slight hesitation from Soifon is already enough for Kisuke.
"Now then, allow me to expand on what I just said earlier. In exchange for you not telling a soul anything about this place, its inhabitants and me being alive, I'll teach you what I can regarding 'Ki' including how to utilize it and how to combine it with your Reiatsu. And with just that, depending on how good you are, you could double if not triple your combat effectiveness. You can even take on Baraggan's miasma without much problem once you've achieved mastery."
"...You're not lying, are you?" Soifon replied.
"If you think I'm lying, we can stop here."
"...Please go on."
Kisuke nodded, "Your second choice is, including everything in your first choice, I'll also teach you about 'Magic' like how I would with 'Ki'. It could also increase your combat effectiveness, but I'm not sure how much due to its incredible versatility. In addition to that, I will give the Gotei 13 detailed information about Magic and Ki, increasing the Seireitei's overall strength. Of course, this also includes my promise of telling you what Yoruichi and I were doing this past decade and where exactly we went."
Soifon thought hard about it and asked, "What are you researching?"
"A Gigai... No, I can't call it a Gigai anymore. I want to see if someone from the Soul race could have a physical body without limiting their characteristics or abilities while also opening up various possibilities in their future.
Soifon glared at Kisuke, "What for?"
But Kisuke was unaffected by that and answered, "I'd like to keep that to myself for now. But if you really want an answer, all I can give you is that if things go the way I'm expecting, it'll be necessary in the future."
Soifon became silent once again for a few moments before sighing and standing up, "Give me a day or two. And I'd also like to borrow the training ground."
"You're free to use it however you want."
Without saying another word, Soifon left Kisuke and headed for the training ground.
After making sure that she wouldn't be able to detect anything he would do, Kisuke immediately put up a barrier around him and answered the phone that had been secretly ringing since earlier, "Kyouraku-san, I'm sorry for not answering immediately. I was talking with someone."
[It's fine, but I'd like to ask first, how is our precious 2nd Division Commander? It has been a few days and the guys concerned about her are getting restless.]
"She's fine and she has already made a full recovery. Though there's just a tiny problem."
[Problem? What is it?]
"Due to my carelessness, she saw me."
[...] Kyouraku on the other side went silent for a few seconds, [...I didn't think you'd make a mistake like that... Or is it really a mistake, Urahara-san?]
"Please, it's a real mistake on my part. If I really wanted her to stay here, I could do so without risking myself."
[...I see. What's her future like?]
"I'm still trying to figure that out but obviously, she can't leave without me making sure that she won't trash everything I'm working so hard for."
[But that can't be for too long.]
"I know. That's why I'm thinking of appearing in our house in Karakura Town sometime after this. Of course, as the 'white-suited man'. I'll leave it to you so that it won't turn into a siege situation."
[I'll do my best on that part, but I can't promise that it'll be totally peaceful after what you just displayed down in Hell. Lisa-chan and the people who went with her are still having nightmares, you know? Not from their enemies but from your Zanpakuto.]
"Well, I'll believe in what you can do for now."
.
.
.
Shunsui and Kisuke talked for a few more seconds before they both hung up.
And as soon as Shunsui put away his phone, soft footsteps rang out from behind him, "...Captain."
Shunsui turned around and saw Nanao with an extremely concerned expression, "Oops. It looks like you heard me."
Nanao knew that if he really didn't want her to hear the conversation just now, she would never be able to, "...What was that? And why did you allow me to hear all of this?"
Shunsui started walking and walked past Nanao while saying, "I don't know what you're talking about. But you know me, I'm really afraid of plans going smoothly."
And before Shunsui closed the door behind Nanao, he added, "That's why I'd like my own insurance. But setting that aside, it seems that the white-suited man will appear within a few days. I'll send you out with the envoys. Your mission is to keep things from going violent."