Since Kuroto showed both of the Mangekyou Sharingan pairs to Shisui, naturally he does not intend to conceal what he put Ryota and Hideki through, as such he briefly mentioned the 'Mangekyou Sharingan Project' to Shisui.
Of course, Kuroto did not disclose everything and only roughly mentioned some of the details of the experiment with just a few words that would give Shisui a general idea of what exactly he did.
After listening to Kuroto's words, Shisui's conscience was screaming to him, "Kuroto-san, you really are a cruel person!"
From a rational point of view, Kuroto's 'Mangekyou Sharingan Project' is not only a test on living humans but is actually mind-breaking gruesome torture. Of course, that's not a problem as Shinobi have to constantly torture out all sorts of intelligence out of their enemies so torture is not that big of a deal, and even human experimentation is also not wrong after all if you don't study all sorts of things then how will new things be researched?
What's important is that the subjects used for torture and human experimentation generally are enemies and criminals, but here the subjects of the experimentation were neither enemies nor criminals, putting them through such a 'Stimulation Test' is really inhuman.
But considering the fact that both Hideki and Ryota would have been killed anyway so whether the 'Stimulation Tests' were carried out or not does not change their inevitable death.
In the first case, they would have met a simple death, but because of the 'Mangekyou Sharingan Project', that was no longer the case.
And the result of this project also cleared up the suspicions on Shisui, at the same time created another 'Homusubi' of Amatsukami who poses a great threat towards the Uchiha Clan and the village.
So, to a certain extent, this whole 'Mangekyou Sharingan Project' helped in saving the Uchiha Clan from heading towards destruction in one way or the other.
But with human beings' hypocritical nature; no matter how rational and correct something is, they would feel some sort of aversion and rejection towards certain things, what's more, the test subjects Kuroto used were still living and breathing Uchiha clan members who were not even charged with any crimes, as such, Shisui can't help but feel a bit of disgust after hearing such a thing, it is basic human nature and there is nothing wrong with it. Unless you are too familiar with such things you would naturally be repelled.
Therefore, Kuroto did not mind Shisui's words, he knows that he was cruel towards them. Kuroto is not a saint-like Uzumaki Naruto, nor does he plan to become one, he would do what's necessary, irrespective of whether that is morally a good thing or bad thing… it does not matter to him.
Even though Kuroto did not say anything, Shisui realized that his tone was not correct and apologized, "I am sorry Kuroto-san, I was a little rude just now, I know you did this to clear up suspicions on me and for the sake of Uchiha Clan, and yet I spoke as such, please forgive my conduct!"
Shisui is obviously not stupid, he obviously understands that this is not the only reason Kuroto-san did so; but does it really matter?
In the end, it did clear up the suspicions on him as well as paved a way for the Uchiha Clan to integrate back to Konoha, throughout the incident of Uchiha Hideki and Uchiha Ryota, the tension between Uchiha Clan and Hokage faction has calmed down a little, even people of Konoha have some sympathy for the Uchiha that their shinobi had to go through such attacks by Amatsukami.
Overall, the emergence of Amatsukami has not only disrupted the Uchiha Clan's plans for the coup by shifting their attention from rebelling against the Hokage faction to destroying the Amatsukami but also forced them to unite with the Hokage faction if they want to be able to do so.
If Uchiha Clan alone plans to destroy Amatsukami or if the Hokage faction alone intends to annihilate Amatsukami then that's just a pipe dream, as such both the factions have no choice but to work together to deal with Amatsukami, and when people work together, they form emotional bonds which are hard to break so the relationship between two sides will obviously be mended and the distrust will also disappear, of course, all this will take time and continuous pressure.
Kuroto did not say anything in regards to Shisui's words, clearing up Shisui's name or preventing the annihilation of the Uchiha Clan is not the only reason he conducted these tests, he obviously has his own reasons and selfishness involved, which he is obviously not going to mention to Shisui for now, therefore, instead of discussing this, he changed the topic and said, "I am going to fuse these two pairs into a pair of Eternal Mangekyou Sharingan."
Shisui was confused, "Into an Eternal Mangekyou Sharingan?"
From Shisui's reaction, Kuroto can judge that he isn't yet aware of the secret of Eternal Mangekyou Sharingan.
In today's shinobi world apart from Kuroto, Uchiha Shinichi, Uchiha Hideki, and Ryota brothers, and perhaps the Uchiha Patriarch, only Obito, and Zetsu should be aware of what an Eternal Mangekyou Sharingan is.
And Kuroto thinks that Uchiha Fugaku would not be idiot enough to give out such critical and important secrets if not necessary for many reasons that aren't even needed to be explained.
So, Kuroto thought a little and said, "If I didn't guess wrong, your vision should have started to decline, right?"
Not to mention Shisui's Mangekyou Sharingan pair, even the vision of Ryota's Mangekyou Sharingan pair that Kuroto used has started to decline because of such heavy use both the time.
Even in the original series, Sasuke who awakened the Mangekyou Sharingan was nearly blind after using his Mangekyou Sharingan in only a few battles, therefore it is not strange that Shisui has had his Mangekyou for so many years and even used several times will start to have his vision declined.
Shisui did not hide this and nodded, "Yes, my eyesight has declined somewhat."
Hearing Shisui's words, Kuroto spoke, "The reason why your patriarch chooses to keep his Mangekyou Sharingan hidden and would rarely use its power is also somewhat related to this issue, a Mangekyou Sharingan will always lose its vision after each use." – Explaining up to here, Kuroto added, "And that vision will keep declining until you become blind eventually, but Eternal Mangekyou Sharingan is one of the ways to not only gain eternal eyesight but also increase the power of the Mangekyou Sharingan."
Shisui nodded, but there was something really puzzling him, "I guess I understand that but Kuroto-san I have a question, why do you know of so many secrets of the Uchiha Clan that even I, as an Uchiha is not aware of?"
Kuroto said, "I learned these secrets from some hidden scrolls that I permanently borrowed from Shimura Danzo's Root base, without taking his permission of course, and from what I can tell, Nidaime-sama seems to have conducted quite a lot of research on Sharingan and all that research was inherited by Danzo, and since I have 'borrowed' some of that research, I managed to learn some secrets!"
Of course, that's a lie, Nidaime-sama may have some research on Sharingan as Kuroto stated but Kuroto neither needed to 'borrow' it nor did he try to, but Shisui does not need to know that, as long as the blame is put on Shimura Danzo or Nidaime-sama, then everything is well and good for Kuroto, after all, these dead people and soon to be dead people must have some uses right?
'Permanently borrowed without permission? Isn't that literally stealing? Forget it! Just think that you didn't hear any such information.' – Shisui thought with an awkward smile.
Kuroto said, "Well from there I learned about Eternal Mangekyou Sharingan and the method to gain it." – after a short pause, Kuroto continued, "And I plan to fuse these two pairs into a pair of Eternal Mangekyou Sharingan, but before doing so, I still need something from the Uchiha Clan that only you can bring me, it's called a Transcription Seal."
"Transcription Seal, I seem to have heard that term before, where have I heard it?" – Shisui thought about this for a few seconds and then replied, "Right, I remember, I heard Patriarch mention this technique once, it is a technique that can seal a Mangekyou Sharingan dojutsu power into the targeted subject which could be many things, like sealer's own Sharingan, other's Sharingan, and into some other objects. This seal can activate when a certain requirement set by the sealer is fulfilled!"
Kuroto nodded, "Yes, that's exactly the one I am talking about!"
Shisui hesitated a little, then said, "I will try to ask Patriarch if he can teach it to me, as long as this technique is not too dangerous, I think he should agree to it!"
Now that the suspicions on him have been cleared up, so Shisui is once again the second figure of the Uchiha Clan, therefore, Uchiha Fugaku should not deny his request.
What's more, 'Transcription Seal' is not some Kinjutsu like that of Izanami or Izanagi, so Uchiha Fugaku should agree to teach it to Shisui.
Kuroto nodded and said, "After these two pairs are fused into a pair of Eternal Mangekyou Sharingan they will be kept with me for some time, when your eyes go completely blind in the future, make sure to inform me, I will replace your eyes with this pair of Eternal Mangekyou Sharingan."
Shisui shook his head, "I don't think I will ever transplant that pair, it's better that I stay away from them." – Deep down inside, Shisui was still resisting the two pairs of Mangekyou Sharingan in front of him.
In regards to Shisui's words, Kuroto did not say much, he also understands Shisui's character, therefore, there was no need.
Moreover, it will be a while before Shisui's eyes go completely blind because Shisui has always had an awe of Mangekyou Sharingan and has been very restrained in using it, even the few times he has used Mangekyou Sharingan, he has mainly used Susanoo, did not once use Kotoamatsukami, so the speed with which his vision is dwindling is a bit slow, as long as he keeps this up, he should be fine for a few more years.
With that out of the way, Kuroto resealed the two glass capsules in the sealing scroll and put the scroll away.
At this time Shisui suddenly asked, "Kuroto-san, you mentioned before that our method will delay the conflict between the clan and village, but it won't solve the conflict for good, and you also said that the situation in the village will change for the better in the future, what will be happening in the future? What is the way out for the Uchiha Clan from all of this?"
Kuroto raised an eyebrow, he didn't expect Shisui to suddenly ask this question out of the blue and fell into a bit of contemplation.
Shisui didn't interrupt Kuroto, while he was thinking, he sat in silence as he sipped the tea which was already cold, and ate the rice crackers.
After a long silence, Kuroto recovered to his senses and said, "Shisui, do you believe in 'fate'?"
"Fate?" – Shisui muttered to himself, he was puzzled why Kuroto-san would suddenly ask something that has no definitive answer, so after a bit of thinking, he shook his head, "No, I don't believe in the so-called 'Fate'."
Kuroto smiled bitterly as he said, "Yes, I don't believe in 'Fate' either, but what I want you to tell you, and what I want you to know is that this damn fate really exists…!"
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Read up to Chapter - 493 on P.a.t.r.e.o.n. Page: p-atreon.com/Milta_translations