Last time in i was reborn in demon slayer as an Uchiha

"thank you,"I said

"no problem"He answers with a smile

"How those it feel to be 16 year old"I said looking at Rengoku

"I feel nothing at all"Rengoku replied

I just let out a small chuckle before looking over at Senjuro and saying"How were you doing"

"I can use flame breathing"Senjuro said with a smile and for some reason even if he was happy he could finally use flame breathing after so long of practicing with me,it didn't make me happy. Matter of fact i felt conflicted and a bit scared.

"Good on you Senjuro,"I said to the little boy

He was content with my answer and gave me a smile saying"If you watch don t your back,one day i will cath up to you and surpass you"

"A child can dream,"I said looking at the little boy

He just crossed his hands on his chest and said"You will see"

I just smile

Now we continue where we left off

"Atoru let's fight," Rengoku said

"Uh, why so suddenly"I said a bit taking it back.

"I want to see how much you improved,"Rengoku said enthusiastically.

"Sure,I wanted to see how much you improved too "I said slowly getting up.

Rengoku got up also and I followed him to the training area, when we reach there, he took out a wooden sword and tossed it at me.

I caught it and i look closely at the wooden to see that it was the sword that i used to practice with,i look up at him and he just smiles at me.'This may get dangerous so for Senjuro and this compound's safety let me place a barrier seal'I thought as i made a seal around the training area

"This is your old training sword, I kept it in pristine condition and made sure it was usable until you came back for it"He said when he noticed that I was looking at him.

"Are the rule the same as when we were kids?"I said looking up at him

"Yes, and don't you dare hold back against me,i want to see how much you improved, "Kyojuro said getting into his stance.

"you will have to show me that you can withstand me at 100%"I replied

"Than i just have to show you the fruit of my labor"Rengoku replied

I got into my stance and observed Rengoku closely, we observed each other for a while before a leaf fell down from a tree and slowly made its way toward the floor, the leaf gracefully landed on the floor and as soon as it had landed on the floor, Both Atoru and Rengoku rushed toward each other with their wooden sword in their hands.

"Flame breathing  First Form: Unknowing Fire" Rengoku said as he dashes towards me at tremendous speeds, he was moving so fast that the floor below him cracked, When he got close to me he unleashed a singular horizontal slash directed at my neck.

"Sun breathing First form: Dance,"I said as i delivers a single high-powered vertical slash to meet his attack head-on.

A huge crack appear on the floor where we clashed, When i look at Rengoku i saw that he had a serious look on his face, We both jumped back from each other to get some distance before we rushed toward each other as soon as our feet touched the floor.

We clashed a couple of times creating craters along the way, Senjuro was watching the fight and he could barely keep up,  he was just memorized by the few move that he could see, the only thing that made him even be able to tell a fight was going on was because a bunch of craters were being created and that he could see, some random fire appearing here and there.

"Is this all you got?"I said looking at Rengoku

"No, This is just a warm-up," Rengoku said looking at me

"Then let us bump this up a notch,"I said as i started to infuse some chakra into my muscle.

"I hoped you would say that, "Rengoku said as a green glow started to envelop his body

" First Gate of Opening, Open"Kyojuro yelled out as his body was now engulfed in a green aura.

He then breathe in deeply before he said"Let me show you the fruit of my labor" as soon as he said that,a yellow aura appeared next to his green aura as his eyes went blank.

"He did not just do that, "I said realizing what happening.

I immediately turn on my Sharingan and as soon as i did that he appeared in front of me.

He swung his sword toward me but i had time to dodge,i then try to kick him in the chest from my position but he dodged my attack.

"Flame breathing Third Form: Blazing Universe"I heard his voice say as he performs an arcing downward vertical slash. Considering that I was still hadn't retracted my leg from the kick, he had an advantage which was my center of gravity was currently off-balance but i didn't care and met him head-on while using"Sun breathing Third Form: Raging Sun" but instead of using two horizontal slashes, i only used one to defend myself from Kyojuro incoming attacks.

We clashed but gravity was working against me and Kyojuro's attack eventually imprinted my back into the floor, Making an even bigger crater, Some air managed to escape my lung because of how fast the hit landed on me.

I managed to kick Rengoku off of me, I stood up and wiped some of the debris out of my face before i said"guess you improved a lot more than i thought"

When he noticed that the amount of damage that he inflicted on me was minimal at best and just mildly annoying at worst he just smile.

"I would have been disappointed if that was all it took to beat you, "Kyojuro said sounding proud.

"I'm going to admit that you surprise me during this spar, but if this is your full power then you don't stand a chance against me, "I said looking at him, with a grin on my face.

"This is not everything that I can do,i had hoped that this would push you a bit but i guess its about time i take this seriously,"Kyojuro said as his green aura started to turn red and his skin started to turn red,as a bunch of Veins started to appear on his face.

I could sense the amount of power that he was emitting was strong and i could tell he couldn't maintain this level of power for too long, 'I'm just glad that i had placed a barrier seal, or else this whole place would have disappeared from the face of the earth.' I though

I smile before i made the ram hand sign, creating 50 copies of myself.

"This is going to be fun, "I said with a grin on my face

A/N What do you think of Rengoku powerup