This is a random battle fanfic between Sasuke and Orochimaru that I wrote when i was bored.
Have Fun Reading! P.S. The Otaku messed up my format so it looks all weird.

Chapter 1: Skinning The Snake Fang Darkblade

"I thought you looked frail," Sasuke took a step back, "I thought you were going to be trapped in that body for another six months."
Slithering to his feet, the villain shrugged, "Maybe this form was too weak to begin with. Or perhaps I burned too much of its life force, regaining the use of my arms."
He dropped his shoulders, and his arms extended to almost twice their original length.
"Either way I still have more than enough left for the weaker sibling."
Sasuke looked back at the entrance, weighing his options. He saw Kabuto's smirking visage as the reinforced doors slammed shut.
As Orochimaru's arms reached the ground, the skin and even some of the muscle sloughed off. Underneath were scales; so pale they were almost translucent. The shedding stopped, and instead of arms, the Sannin had two large vipers extending from his shoulders. Their transformation complete, the serpents lifted their heads, staring at the teenager in hungrily.
Sasuke threw a trio of shuriken with each hand. Orochimaru's reptilian arms knocked the blades away without even taking a scratch. The jutsu hunter's robe shredded, chunks of flesh pouring off his torso. As the Sannin's host peeled away, the form of a coiled snake was revealed. Fortunately, the ninja creature's breeches remained, intact, but the skin on his feet also shedded, showing clawed, scaled toes.
"Mi, Hitsuji, Saru, I, Uma, Tora," Sasuke shouted, spitting a sphere of flames at his former master. As Orochimaru's body and neck started to unwind, his serpentine hands gestured and spoke.
"Mi, Tastu, Tori, Inu, Ne" the twin snakes invoked, "Ninja arts, Mud Surge Jutsu!"
The ground erupted between them, a cresting wave of muck enveloping the Uchiha's fire art. The rebel teen was forced to abandon his attack to avoid being dashed against the wall.
"Wind Release, Vacuum Blade," He drew his chokutō and cut upwards through the mire in a single stroke. Behind the wall, he saw Orochimaru's molting was complete. His legs remained covered, and mostly unchanged. But from the waist up, he was a twenty-foot long constrictor. Five feet below his head, the two ten-foot vipers jutted out as his arms. The Sannin's face was mostly unchanged, except his canine teeth had lengthened into hypodermic fangs.
"This is what you have chosen to become?" Sasuke sneered, allowing his obvious disgust to show.
"This, foolish boy, is my soul shell," Orochimaru hissed in triplicate, "It is the natural form my spirit takes when it manifests outside a body. It is much more powerful than a physical body."
"Then why steal bodies?"
"Because," this time, only his head spoke, his 'arms' were beginning to craft a new jutsu, "For all its power, the soul shell begins to fade without a material form to anchor it. Also, without a charka network, I cannot recover my energy."
"Necromantic Arts, Flesh Bomb Jutsu," the villains hands whispered. The serpents scooped up chunks of the discarded skin and muscle in their mouths and tossed the tissue, not at Sasuke but near him. As expected from the jutsu, the missiles exploded; however rather than force or flames, the eruptions filled the air around Sasuke with vile fumes. Coughing, Uchiha dove out of the cloud.
"You are correct, of course," the main head grinned in dark amusement as the left arm deflected the younger ninja's sword, "I could have given you so much more power. It was actually amusing trying to balance it. Making you strong enough to be a worthy host, teaching you enough that you would not leave, and yet keeping you weak enough that you could not oppose me."
Stony spikes erupted from the floor around the boy, still struggling to clear his throat. He dodged most with ease, but was forced to shatter one with his blade. Sasuke countered with another fire jutsu; this time sending out four random trails of flame, which converged on the villain. But Orochimaru gestured contemptuously, and the inferno turned back on the self-proclaimed avenger. Uchiha leapt over the flames, towards his former master, swinging his sword horizontally. The right arm reptile intercepted the slice, but no blood exited the wound. Instead of muscle, there were more layers of scales. As the weapon was with drawn, the cut closed completely.
"You cannot hurt me like that," Orochimaru taunted, as Sasuke disengaged, "I don't have blood to spill, or bones to break."
Sasuke's eyes narrowed, then expanded again, turning red.
"Hmm," the snake creature radiated mild interest, "Will the Sharingan work on me? Can you hypnotize all six of my eyes? Can you copy my hand signs when I have no fingers?"
"Mi, Tastu, Tori, Inu, Ne" Sasuke repeated. The copied jutsu created a larger wave than the original had, and Orochimaru watched the approaching mire with moderate approval. But when the wall reached him, he simply raised his right hand, and punched a ten-foot hole through the attack. The wall passed him, but Sasuke was nowhere to be seen. He did not stay hidden for long. Uchiha propelled himself off the ceiling, using gravity to increase his speed and power. The teen aimed his chokutō at the serpent's main head, swinging with both hands. The right hand opened its mouth, and the Kusanagi appeared. Tracing a glowing path, the legendary blade sliced upwards, and Sasuke's weapon was cleft in two, long ways. The next instant, his left hand closed over the base of the damaged sword, breaking off the blade.
The Sharingan user discarded his broken tool with a grunt of disgust. He landed lightly before his master, and quickly began to retreat. Before he could get out of range, the fangs of the left hand serpent clipped the boy's right arm. Smoke rose from the wound, and Sasuke gripped his arm in pain. Despite the pain; as soon as he was out of range, Sasuke launched into another set of chakra seals.
"Raiton," he proclaimed at the end, "Lightning Cannon Jutsu!"
An eight-inch sphere of electricity congealed in Sasuke's hand, and then shot at the soul shell of the Sannin. Orochimaru displayed definite surprise, and was unable to fully dodge the ball. Instead, it burned a substantial chunk out of his right leg. Even though the wound quickly vanished, the slitted eyes regarded the teen with newfound respect.
"I did not teach you that jutsu. I wonder where you learned it?"
The avenger did not respond, and watched the immortal warily, planning his next move. His lungs still burned, and his arm was starting to go numb from the poison.
Before the younger traitor could act, the body-thief took a step forward. Then, before his apprentice could react, almost faster than the Sharingan could follow, he moved behind Sasuke, and slashed twice. The long blade cut the tendons in the back of Uchiha's knees and ankles.
"I had hoped you would be better than this," the hissing was truly disappointed, "I will have a much greater distance to make up…"
After swallowing the Kusanagi once more, Orochimaru's right arm joined his left in constricting the Genin. The monster's jaw distended, and the arm vipers lifted the teen, so that Orochimaru could swallow Sasuke feet first. The last Uchiha kicked feebly as his injured legs were enveloped.
Kabuto's face lit with vicious joy as he watched his arrogant junior consumed. As the Sannin prepared to make the final gulp, his lieutenant started to turn way from the monitors. But something caught his eye, and he spun back. He punched buttons rapidly, and the image feed paused, and then started to crawl backwards. And there it was. Just before the boy's face disappeared behind the fangs, Sasuke grinned, triumphantly.