Zouken

Using Shundō, Jun flashed across the entire residence searching every room until he came across the one he was looking for.

"So this is where you were." He said in a mocking tone.

"A child?" Looking at the small boy in front of him, Zouken's felt his non existent eyebrows furrow.

Standing inside the study room, both Jun and the old man stared at each other.

"You know, I never thought someone as ugly as you could actually exist. I mean your a bald headed, grey alien looking piece of shit with magical herpes. I mean no offense and all, but if I looked like you I would probably kill myself. And not to mention that your magecraft is literal bugs. What gave you the idea that bugs would be a good idea? The Tohsaka's have their Jewels, the Einzberns have their alchemy, but your retarded brain chose bugs? I don't know if its a fetish or not but you seriously need to see a doctor." Jun summed up.

"Hahahahahahahahahahahahahahahahahahahahahahaha" Bursting into laughter, Zouken's body shook as he stared down at the white haired child.

"To think that a mere child was the demon that everyone was worried about. No, you're a demon so you may even be older than me, how envious." He burst into dark laughter once again.

Staring at the crazy old man in front of him, Jun felt thoroughly disgusted but put on a smiling face. "You okay old man? It'd be really convenient for me if you had a heart attack and died."

"Oh I'm fine. But you are a fool. For a demon to deliver themselves to me on my doorstep, even fate wants me to succeed. I'll slowly open you up and find out what allows your race to live so long." While saying this, he looked at Jun as if he was prey.

"You do know that I'm going to murder you right?" Jun said tiredly. "Plus I'm kinda in a hurry."

Remembering that Sakura was probably still in that pit, he decided to stop wasting time.

Before Zouken could say anything more, Jun's figure flashed and disappeared.

...

Walking down the stone steps leading to the secret basement, the sight of the bug filled pit entered his sight.

And in the centre of it all was the blank faced Sakura.

"Sakura..." Jun muttered in a sad tone.

"You know her name? How surprising." Zouken's voice echoed in the chamber.

Without looking for the origin of the voice, Jun said. "Y'know, you are one sick motherfucker. And how the hell did you get here so fast?"

"Oho, you've got quite the mouth on you for a child." Zouken joked.

Walking down the stairs, Jun heard the comment and smiled.

"Like you said before. My physical age and actual age don't exactly match."

'Well that's if I add in my age from my previous life.'

His thoughts were interrupted once more by Zouken's voice.

"All the more reason to dissect you."

*Sigh*

"I don't get your obsession with immortality. Those who have it usually curse their fate."

"A demon like you wouldn't understand! Do you have any idea how it feels to have your bones grow weak and have your flesh slowly wither? To have your mind deteriorate and your body fail? Of course you don't! Demons would never understand the anguish of us humans!"

"So you're doing this for humanity? To me it just sounds like you're a little bitch that fears death. What a pathetic old man you are. You gave up everything for this goal and even cast away your body and for what? A dream that will never come true! You and I both know that the grail is corrupted! What you're doing is wasting away what little life you have left. And to make it worse you involved Sakura! You had her body and mind violated by your disgusting insects and you dare tell me that you're doing this for humanity!" As Jun reached closer and closer to the bottom step, the demonic energy in his body kept pouring out like a tsunami and covered the room in violent blue light . "Be grateful Zouken Makiri, because for the first time in my life, I am infuriated!"

<<Vergil Skillset – Perfect Judgement Cut>>

Unsheathing Yamato a speed that no human could hope to see, Jun activated his mystic eyes and used Yamato to sever every line of death of every insect within the mansion. Even the ones hidden above ground weren't safe as Yamato cut through space to hit their lines of death.

"Impossible!!" Zouken's distorted voice echoed out as he felt the death of all his insects.

Seething in rage, Jun felt his demonic energy rising to a level that could no longer control. Blue sparks flashed around his body as he felt Yamato roar.

...

"T-This POWER!!"

Standing outside the mansion, the man in the white suit and top hat had a shocked look on his face as he felt his whole body shake when he felt the demonic power escaping from the mansion hit him.

"INCREDIBLE!!!"

...

Hidden in the darkness, Gilgamesh lost his arrogant demeanor and looked at the mansion in all seriousness.

...

Even the white haired man in the distance felt uneasy by the amount of demonic energy crashing into him.

"What is this!"

...

Collapsing to the floor, a black haired Japanese man's body started to spasm as the demonic pressure was too much for his weakened body to handle.

"KIRITSUGU!!" A yell erupted from a red haired child and a brown haired teenager.

...

Releasing wave after wave of demonic power, Jun was about to completely destroy the Matou estate and the surrounding area until he heard a weak cry that brought him back.

"Nee-san...."

'Sakura!'

Opening his eyes wide, he remembered that he was here to save her.

'What was I just about to do!'

Looking over the teary eyed Sakura, he felt deep anger at not just Zouken but himself. He let his rage consume him and almost ended up destroying everything including Sakura.

Sheathing the Yamato, the raging demonic power calmed down and retreated back into his body.

With his perfect judgement cut, every insect in the mansion should be dead. This included the ones that made up the fake Zouken body.

Walking towards Sakura, he saw that she had the same blank expression as before. The only difference was that there was a single tear rolling down the side of her cheek.

'Time to finish this.'

Now that he had calmed down, he unsheathed the Yamato and activated his mystic eyes. Looking over Sakura's body, he saw the lines of death scattered all over her body. Focusing on the one next to her heart, he saw the true body of the magus.

Looking into Sakura's dull eyes, he didn't hesitate to drive his blade through her.

'Goodbye Zouken.'