Sasuke ignores Izumi's pleads to stop fighting and charges full steam ahead towards Itachi with his fist raised up in a striking position. He suddenly felt sparks coil around his eyes and entire body, his heart rate and blood-flow was also rising. It felt like a rush of adrenaline and chakra was entering his body. It was like he was getting more powerful and faster by the second. He actually feels that his body was lighter and he could run faster than ever before. Like his powerful chakra was boosting his speed.
In front of his eyes, he could see blackish glowing lines everywhere and all of the vital spots of Itachi. A surge of darkness lurks deep within Suzaku's body. His charka changes from a dark blood-red color fused with a demonic shadow-black color. It was like a demon was within him. His eyes however still remain a dark purple color, darker than a Rinnegan(A/N: Common Rinnegan eye-trait color is light-purple tint).
'Can this be the powers of my eyes? Are those 'Lines of Death'?' Sasuke looks at the blackish lines surrounding Itachi and clenches his fist as he charges ahead with sharp focused eyes. He had to be alert, he was up against Itachi who was a young prodigy shinobi of the Uchiha Clan.
Itachi quickly does an undercut kick. He was super fast. So fast that Sasuke barely dodged the kick even with the speed of Mintao's Space-Time-Ninjutsu he was almost kicked. But Sasuke was faster and stronger than Itachi, in a flash, Sasuke activated his eye powers without even realizing it.
Itachi also activates his Sharingan, but it was already too late. Sasuke and Itachi kick and punch each with an array of Taijutsu techniques. They even did precise skillful backflips and jump on top of forest trees and continue to punch and kick each other. They were moving so fast only brief outlines and shadows of their bodies were seen(Kind of like after-images of their bodies).
'I had enough of this foolish kid,' Itachi uses his Sharingan Genjustu's to control and manipulate Sasuke's mind and body.
'Tch, you think that will work on me,' A bright flash of red and black sparks flicker out from both of Sasuke's eyes which were now glowing a dark blood-red and purple color. He actually countered Itachi's Genjustu and cancels it! Itachi is also frozen and doesn't move. Thousands of reddish 'chakra-chains' wrapped around Itachi's body(A/N: Like Gilgamesh Noble Phantasm, Enkidu(Chains of Heaven, accept the chains were made of blood and chakra). The fight was already over before it even began.
'What!? How is my brother so fast!? How did he counter my Sharingan? Why can't I move!?' Itachi's eyes widened with shock, for the first time in years he truly felt fear. Sasuke had awakened his rare unknown bloodline-eye powers by instincts.
In mere seconds, Sasuke does a sideways tiger kick on Itachi's stomach and then one fierce upper-cut punch under his chin.
Blood spurts out of Itachi's mouth and nose and his body slams against a nearby forest tree.
*THUD!* He is instantly knocked out. 'I let my guard down...' Itachi slowly closes his eyes and coughs out blood.
"ITACHI!" Cries out Izumi as she runs over by his side.
"Don't ever talk down on me," Sasuke cracks his knuckles and spits out blood into rocky ground and walks away. He was actually punched once in the face by Itachi during their one on one fight.
Suasuke was now the one showing his back to Itachi like he was a mongrel. He was showing Itachi who was stronger.
"Where are you going !?" Izumi shouts and points at Suzaku with a pissed-off pouty face.
Sasuke averted his eyes to face the maddened Izumi. His eyes stopped glowing.
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This chapter needs to be edited.
A/N: Now things are about to get strange. I am planning out the rest of this story and I want to make it as good as possible. I know I could make the fight better, but let's be honest, The MC is OP and he hasn't even fully awakened all his powers and Beast System yet. Remember this story is non-canon. And thanks for the Input someone gave me a really good idea for the MC to be paired up with Hinata and other 'good' characters for the harem.
Guys give me more suggestions they really do help better this story.