[A/N: Sorry for the late update, got caught up in procrastination.]
In Konoha, one week after the Hyuga Massacre an unremarkable purple haired Chunin left his small apartment and walked towards the Konoha research laboratory where he worked as a lab assistant.
The research facility, under the management of one of the three Sannin Orochimaru was used to conduct various experiments on all sorts of things.
This Shinobi known as Kazu Naka after entering the facility walked towards a certain office and knocked a few times on the wooden door.
After a few moments a voice spoke from the other side, "Enter."
Pushing the door open Kazu walked inside the office of the director of this research facility, Orochimaru.
Orochimaru stared at him with his piercing yellow snake pupils. A gaze that would make anyone shrink but not Kazu.
Suddenly one of Kazu's black eyes turned into a spiral patterned Sharingan and Orochimaru's pupils shrank as he got up hurriedly.
Before he could make a move his eyes glazed over and he fell back on his chair.
'I didn't expect him to manage to resist even though it was only momentarily.' Shitsuya thought.
The reason he came back to Konoha this time around and committed the massacre of the Hyuga clan was precisely for Orochimaru.
Orochimaru was doubtlessly the most brilliant mind of his age and the person with the highest scientific knowledge.
Shitsuya would make great use of Orochimaru in his plans after placing him under his control, hence why he destroyed the Hyuga clan to lessen the chance of his actions being revealed.
Shitsuya's objective to this day remains clear and simple return back home, back to his life and back to his family.
The current plan he has in mind for doing so is through the genetic gift of the Uchiha clan, the Mangekyo Sharingan.
Not his Mangekyo however, instead he would use the Kamui, the ability awakened by Obito.
Using it would not only grant him access to the Kamui dimension but more importantly could also allow him to open portals to other dimensions.
With enough chakra, Shitsuya theorised that he might be able to finally return back to earth.
Getting the Kamui was easy, he could just wait for Obito to awaken it by himself or could expedite the process by a few years himself through some effort on his part.
Chakra was the main issue, Obito at the end of the story had fully mastered Kamui with half of his body being made up of Hashirama cells yet even he could only open a portal to an adjacent dimension for a few seconds with the assistance of Sakura.
The obvious fix for that would be to become a Jinchuriki, the problem with that was that Kamui couldn't activate very easily with a tailed beast weighing down the user.
That meant that he would need to find another way and Shitsuya chose cellular transplantation.
Of course instead of using something as cliché as Hashirama cells he would be using the cells of an old girlfriend of his.
*****
Orochimaru proved to be far more resistant to genjutsu than what Shitsuya expected considering his future track record.
He used his Mangekyo to cast a potent Genjutsu yet Orochimaru could still put up a resistance and if given a few days or so Orochimaru would definitely break out fully.
This meant that he would have to reapply the Genjutsu every now and then like a light layer of makeup as applying a thicker layer although would last longer it would dull the original features which Shitsuya was interested in.
Other than that things progressed smoothly as Shitsuya settled into his new life in Konoha under the identity of the unassuming Kazu Naka.
Although he was unassuming his actions were far from it, his previous stint involving the Hyuga clan put quite the heavy pressure on Konoha from both the inside and outside.
The Hyuga Clan, the second most powerful clan in Konoha was exterminated in a single night with non the wiser.
This made Konoha and it's higher ups appear weak to outside forces who seized the opportunity to dig Konoha a deeper hole with the usual tactics, spreading rumours, sabotaging missions and even openly crossing the border with large forces in provocation.
The threat of the third ninja war hung overhead like a sharp blade.
Internally, all the clans in the village were quite displeased with the Hokage and Danzo for making such a huge error.
If the Hyuga clan was exterminated so easily what stopped the same from happening to their clans?
Both the third Hokage, Danzo and the two elders, Koharu and the other guy fell under huge pressure for letting such a thing happen under their watch with many already advocating for all of them to resign.
Considering both internal and external conflicts the possibility of Konoha's collapse wasn't out of the question although highly unlikely.
Shitsuya playing as Kazu didn't care however as he leisurely watered his small roof garden while puffing on a cigarette.
Shitsuya was neither a smoker nor possessed any particular penchant for flowers either.
Kazu did however so Shitsuya would have to as well.
Finishing his cigarette, Shitsuya put the cigarette butt in a nearby ashtray before heading off to his job at the laboratory.
Even though Shitsuya had gained control over Orochimaru, his position as a small lab assistant assigned to small rat experiments didn't change.
Konoha had a reputation to uphold so they couldn't conduct human experiments in an official lab like the one he worked in.
Orochimaru did however conduct several human experiments in a secret lab in coordination with Danzo Shimura and ROOT.
Shitsuya used his control over Orochimaru to gain a post in said lab where he would learn all he needed to know.
Truthfully speaking, research was tiresome, most of it was done on paper and involved a lot of guess work with no real indication of where one was going.
Boring and repetitive it reminded Shitsuya of his previous work life, strangely enough although it was boring, monotone, thankless and without much result Shitsuya found a feeling of deep contentment bubble up and ooz from his core as the days blurred by.