After being stuck by lightning fifty times, I decided enough was enough; my gains are insignificant now from the Lightning Forged Method, and unfortunately, the same could be said about Poison Rebirth and Chakra Beast Blood Cauldron. I now had a steel-like body with monstrous strength and was now naturally faster than Yoruichi, much to her annoyance. I went back to the camp while using the Medical Examination Jutsu to monitor the status of my body.
I stopped cold when I found something. I had accumulated toxins and dead cells in my body I hadn't noticed before because any previous amount was too small. I thoroughly checked my body with the Medical Examination Jutsu and made note of the toxins and dead cells in my body. Luckily, all of it was still treatable, and with my knowledge of Medical Ninjutsu, I already knew what to do.
As I returned to my camp, I noticed Yoruichi was still gone, but I shrugged as she was still making progress with her body tempering, even if it took longer than me. I went to the lab tent to make a specialized pill to forcefully expel the toxins and dead cells in my body. It only took a few hours to make the pill that would efficiently expel everything harmful to me. It was as almost as large as my palm as I bit into it and swallowed it.
It was as bitter as heck and barely edible, but as I forced down the last bit, I used Chakra on my stomach to speed up the process after taking off my clothes and heading to my tent. First came pain, then pure agony that destroyed my ability to think clearly.
" AAAAAAAAAAAAAAAAAAHHHHHHHHHHHH!"
________________________________________
Yoruichi was exhausted as she made her way back to Naruto's camp. While she is making progress, it is still slow going, and it frustrates her to no end that Naruto is now naturally faster than her with no enhancements. Sparring had turned into a one-sided beatdown that still provided valuable experience against facing someone who outclassed her in almost every way.
The dark-skinned Kuniochi's only advantage now was her wide variety of Lightning Style and Water Style Ninjutsu. Except for the fact the blonde could figure out the Ninjutsu by seeing the hand signs and experiencing the Jutsu itself, then copy it and use it against her. Oh, it drove her up the wall when Naruto tanks a Ninjutsu like it's nothing, then uses the same Ninjutsu back at her.
Only powerful B-Rank and above Ninjutsu seem to have any real effect on him; everything else he shrugs off, even Shuriken and Kunai barely scratch him. Yoruichi then recalled her first encounter and fight with Naruto and guessed just how much he was holding back now. The blonde never takes his spear out to fight her, and not from a lack of trying to antagonize him into doing it, but his response was annoying.
" Make me."
The dark-skinned Kuniochi's blood boiled at not being taken seriously by the blonde monster. It only motivated her to train harder and get creative in her spars against him to surprise him. As she made it to the camp, she noticed the barrier was down, and as she got near Naruto's camp, she heard something that chilled her blood: his agonized screams.
" AAAAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHHHHHHHH!"
Without another thought, she rushed to the source of the screams, and her nose was assaulted by a foul stench that nearly triggered her gag reflex, but she was trained to resist such automated reactions by her ANBU sensei. Yoruichi entered Naruto's tent and saw him convulse and scream as black gunk covered his body.
" Naruto!"
She called out as the dark-skinned Kuniochi came over to see what was happening. Naruto didn't even acknowledge her presence as he screamed, and she hesitated to touch him while looking concerned—her first thought was seeing him like this.
" What's causing this?"
The blonde then hacked out blood between screams, and Yoruichi felt something she didn't expect. Fear, the fear of this annoying, friendly, strong blonde monster dying in front of her without being able to do anything. Despite her previous hesitation, the dark-skinned Kuniochi touched his body covered in black gunk to find out what might have caused this. The black gunk was unpleasantly sticky to her hands, and she closely examined it to figure out what it was.
" So this is the source of the smell, but what is it?"
Yoruichi wondered and decided to clean it off Naruto at least to see if there were any injuries on him. She muttered to herself as she got some hot water and towels ready.
" You owe me big for this Naruto."
As the dark-skinned Kuniochi cleaned the gunk off Naruto, she noticed it was coming from him, and she pondered.
" Did you do this to yourself, Naruto?"
She shook her head and focused on trying to help the blonde in any way she could. Yoruichi kept him clean and warm by keeping the fire pit in his tent going. Sweat coated her body as hours dragged by, Naruto's screams turned horse and raw, but the agony he was in didn't stop. Then, suddenly, lightning strikes near the camp, and the dark-skinned Kuniochi realizes they are in danger without the barrier in place that Naruto's Clones maintained.
Yoruichi picked up Naruto and found that he was significantly more heavy than his appearance would suggest. She quickly made some Water Clones to help carry him and made a mad dash to the cave her ancestors had set up to reside in the Lightning Rod Mountains.
________________________________________
The moon hung overhead bright and red with rings connecting to tomoe and a woman floating in the air. She had long white hair with a pale, almost translucent complexion and with cold white irises to match. Two things stood out from her unusual appearance: the two horns atop her head that resembled rabbit ears slightly and a third eye on her forehead that matched the moon's current state.
" Kaguya Ōtsutsuki."
I muttered, holding my spear at the ready as I was prepared to put my life on the line to stop her. However, I found myself unable to move from my spot, and vines started to creep around me as I couldn't move. Kaguya glanced at me and then quickly dismissed me as the vines continued to grow and restrain me. Suddenly, a massive tree erupted from the ground, and a bright shining light appeared from the top of it.
Kaguya flew up to the light and held it in her hand. I wanted to reach for it but couldn't move, and my vision was obscured by the vines wrapping up my body. I was met with darkness, unable to move, unable to act, and unable to live.
I opened my eyes and shot from where I was lying as I woke up from my nightmare with my body drenched in sweat.
" Pleasant dreams?"
The familiar voice of Yoruichi made me take in my unfamiliar surroundings.
"Are we in a cave?"
I wondered to myself before asking.
" Where are we?"
" The cave my ancestors set up to reside and train in the Lightning Rod Mountains. I was supposed to be staying here, but your camp was nicer and more comfy. Now answer my question. What in the world did you do to yourself?"
I took a moment to recall what I was doing prior and answered as I started to use the Medical Examination Jutsu.
" My body had built up a lot of toxins and dead cells, so I created a pill to forcefully expel all of them as efficiently as possible. I made the mistake of discounting the amount of pain I would go through to do so. The pain I was expecting, but I got pure agony instead."
" So you being an idiot then?"
The dark-skinned Kuniochi asked with a playful smirk, and I didn't deny her.
" Yeah, pretty much. How long have I been out of it?"
" Three days."
" Fuck!"
I cursed in English before drawing some blood by piercing the palm of my hand with my finger, thanks to Spear Claw, then used the Summoning Jutsu to call Senko. With a puff of smoke, the fox girl appeared and said.
" Oh, Naruto-kun, it been a-. What is that smell?"
She quickly covered her nose with both hands, and now that she mentions it, this cave stinks to high heaven; I am now noticing. I asked Yoruichi while plugging up my nose.
" Why does this cave smell like something died and shit in here, Yoruichi-san?"
" That would be your doing, idiot, as you had the bright idea of making that pill to expel the nastiness in your body."
" Ah, sorry about that. I will clean it up in a bit."
I apologize and felt more than a little embarrassed by this situation, but other matters come first. I created a Shadow Clone and told Senko.
" Senko-san, please send this Shadow Clone to Haruhime back at my apartment, please. My previous ones got dispelled from my mistake."
" Understood, Naruto-kun, but please take a bath soon and let me know how you are doing soon."
" I will, I promise."
Senko left with my Shadow Clone by Reverse Summoning. I could maintain Shadow Clones in my sleep thanks to my Total Concentration Breathing training, so I just need to send one every couple of days instead of every day. I got up and found that I was feeling good, fantastic even. This is odd since I should be experiencing some weakness instead, considering what I put myself through. I stretched a bit and asked Yoruichi.
" Did you use Medical Ninjutsu on me, Yoruichi-san?"
" No, why?"
She asked back, looking curious, and I told her.
" I feel great even though I should be experiencing some weakness from my dumb idea."
I then requested.
" Can you show me back to my campsite? It's probably ruined by the lightning storm, but I want to see if anything is salvageable."
" No worries there. After I dropped you off here, I went back to pack up the camp; it's in this storage scroll here."
The dark-skinned Kuniochi tossed me the scroll, and I caught it and then showed my gratitude.
" Thanks, I owe you one."
" You owe me more than one, Naruto."
I didn't argue with her, and I already knew how to start repaying her.
________________________________________
As an army of Shadow Clones created by Naruto rebuilt the campsite after re-establishing the Lightning Absorbtion Barrier, he pulled Yoruichi to the side to start repaying her. The dark-skinned Kuniochi asked with a playful look.
" Oh, are you going to profess your undying love for me, Naruto? While I will admit you are easy on the eyes, I can't get the smell that came off you during toxin expelling session out of my mind, so while I am flattered, I can't return your feelings."
The blonde just rolled his eyes and curtly told her.
" Watch."
Before Yoruichi could say anything sarcastic, Naruto used Lightning Style Shunkō in front of her. Her jaw dropped before she started cursing him.
" You monterous bastard! It took me years of theoretical study and painful practice to come up with Shunkō and your use after just seeing it in a few months! Monster! Idiot! Jerk! Dumb blonde! Thief!"
The dark-skinned Kuniochi was ready to rage quit and try to beat up the blonde regardless of the consequences. He sighed and asked her.
" Notice anything different between my Shunkō and yours?"
Yoruichi just glared at Naruto with a frustrated expression, but moments later, her eyes widened in shock as she noticed an important detail.
" It's stable, and you're not harming yourself while using it!"
He nodded and started to explain.
" The two things you are missing when it comes to Shunkō are better Chakra Control and a higher level of Lightning Nature Transformation."
She frowned as she asked.
" I can accept you, maybe having better Chakra Control than me, but how in the hell could you possibly have a higher mastery than me when it comes to Lightning Nature Transformation? I'm the Raikage's daughter, for crying out loud, and the Village Hidden Above the Clouds has the best understanding of Lightning Style!"
" It's not complicated; I'm just better and more determined."
" Yeah, right!"
The dark-skinned Kuniochi retorted with an annoyed look, and the blonde just shrugged as he maintained Shunkō before saying.
" Regardless of what you might think, it doesn't change the fact that I mastered and refined your Jutsu. I am also going to help you reach the same level as me."
" You!"
She wanted to be angry and tell him to mind his own business, that she'll figure it out on her own, but the rational, more practical part of her saw the truth of the matter. He completed Shunkō before her, the creator of the Jutsu and understood that while she was a genius, he was a monster that could be compared to the Third Raikage, her grandfather, Almighty A. Yoruichi grits her teeth in frustration before asking in defeat.
" Fine! What do I need to do?"
Naruto had one of his Shadow Clones bring two glasses of coffee and said.
" Let's start with Chakra Control first. The goal here is to separate the coffee and cream from each other in the glass."
The glass of coffee started to swirl in his hand until the coffee and cream were completely separated from one another, with the cream on the bottom and the coffee on top. The blonde then drank the two colored drinks and told the dark-skinned Kuniochi.
" Your turn."
She grumbles but complies as she gets to work on separating the coffee and cream. Naruto then left her to her own devices as he got to work on a project he had in mind.