Reborn in demon slayer as an Uchiha

The climax

Last time in I was reborn in demon slayer as an Uchiha.

Rengoku pov
I breathe in deeply filling my lung with four times the amount of oxygen it usually gets, I felt my mind get clearer, I felt all the doubts that I had left me and some sort of inhuman strength filled my body.

As soon as I exhale a crater was formed underneath me, it was not caused by my exhaling but because I realize more power exactly when I exhaled.

Veins started to appear on my face and my eyes went blinked but my skin didn't turn red, I was using the second activation of the heavenly technique while also using the second gates in the 8 inner gates techniques.

"If power is what he wants then power he will get," I said before gripping my blade so hard, I didn't notice that I was bleeding and that my blade started to turn into a red blade.

"This better be your best because it no longer holds back, "Shinjuro said before he rushed at

Now we continue where we left off
I rushed toward my father without saying a word and swung my blade toward his neck but he block it using his hands, the sword manage to get around 3 inches deep inside his skin before stopping.

A blade appear in his other hand and he swung at me with full speed aiming to decapitate me,i remove my sword that was stuck in his hand and use the sword to block his strike.

Our blades met and created a lot of sparks but suddenly I had the urge to puke, "What did I tell you about keeping your eyes on the enemy" I heard my dad while he was grinning.

I quickly move away keeping some distance between me and him, 'what was that feeling I felt' I thought looking at my body up and down and seeing no wounds at all.

'Why do I feel like puking then' I thought, I didn't get much time to ponder on it as my instinct was to swing my sword up and so I listen to it and did it.

I saw him smile before he said"What's wrong you not feeling so well,"
I feel like they were something in my throat that was stopping me from breathing,i could feel my blood pumping in my vein and I could feel my heartbeat at a very fast pace everything was heavily slow down for me.

My lungs felt like they were about to explode, and I felt like I was dying inside but I did the recovery breathing that I was taught, at best it will heal it or at worse slow it done so I don't die.

"Oh, is it starting to take effect already"Shinjuro said looking at Rengoku huffing and puffing his lungs outs.

" I didn't have fun but this only lasted a couple of minutes and you're already exhausted, where did all that endurance training you did Go"Shinjuro said looking at Rengoku (A/N bullshit its been at least thirty minutes)

A look of recognition appears on my face as I realize why I felt so tired and why I was getting exhausted so quickly. I remember my earlier fight with Atoru and I realize that my body still hadn't fully recovered.

I breathe in deeply before clearing my mind of any thoughts, "I will put my life on the line if it means stopping you" I said as soon as I calm down,

"Even if you die in the process"He answers looking at me
"I don't care if I die while I'm alive I'm going to make sure you kill no one"I answer calmly

"Haha, This is hilarious then let's see how long you last against me," He said before he gripped his blade and said"Flame-breathing Fifth Form: Flame Tiger"

He dashed toward me and brought his blade into a high guard before he performed a series of sword slashes that took the form of a flaming tiger.

"Flame breathing Fourth Form: Blooming Flame Undulation," I said as I performs multiple slashes in a fluid circular motion to defend myself from incoming attacks.

It looked like I was cutting the flame tiger in half with my blade even if the tiger was twice my size, my precise strikes were tonight to destroy the flaming tiger and defend me from the intense heat the fire emanated

"Don't give up on me now body"I said to my body as soon as I felt all my strength leaving me, I gritted my teeth, this was a bad situation to be stuck in.

"Flame breathing Third Form: Blazing Universe "I heard a voice from above said and so I look up to see the demonic figure of my dad performing an arcing downwards vertical slash,

"Flame breathing Second Form: Rising Scorching Sun"I said I unleashes an arcing vertical slash in an upwards motion, and to gain as much force as possible I brought it up from my tail guard.

We clashed blade again but this time I felt the momentum that he was carrying from falling done pressing on me.

My feet was sinking into the floor but I gritted my and push him back.
'he trying to distract me with an attack and then attack me with a devastating move' I thought as I remember everything he did so far

He distracted or waited for me to be distracted by something before he attacked me,
*Cough out blood*
I looked at my hand and saw the red warm liquid that was covering it, my own blood.

I could feel that my strength was going away as I felt myself revert back to the first level of both techniques.

"Flame breathing Ninth Form: Rengoku"I said before I  assumes a high stance, I also forced my body to reactivate the techniques to highest level I could go, I look like a flame demon.

"Flame breathing tent form Flame God"Shinjuro said before he assume a high stance he breath in and then rushed at me

I breath in deeply before I perform an extremely high-speed dash towards him, i unleash a singular, devastating slash. The technique was powerful enough to completely carve out the ground in its wake, destroying everything I was walking on

*Clang

A/N he literally fought Atoru like a few hours ago, ain't no way he recover yet at most I'm going to say 60 %to 70 % so he basically fighting on an already fatigued body.