(Yes, I support what Vince said. Use speech markers for your character's speaking parts and parentheses for you OOC.)
Looking over his shoulder, Sesshomaru saw the two genin. "This is what the great Hokage sends to stop me. How pathetic." He continued to walk away, ignoring his pursers.
"Hey! Don't look down upon the ninjas!" Naruto took out a kunai and leap to attack the demon. "Naruto, don't." The genin was hit by a sword sheath and slammed into the ground.
"Boy, do you honestly believe that something such as that could take down the Demon Lord of the Western Plains." Sesshomaru looked coldly upon Naruto. He jumped into that air as a Fuuma Shuriken flew past him.
The cries of birds filled the air as Sasuke appeared in front of the demon and used Chidori on his opponent. In front of him, though, was nothing except air. "You are less ignorant than your companion." Sessho grabbed Sasuke's arm and threw him into the ground.
Naruto had just regained his feet as Sasuke slammed into the ground near him, and Sessho landed before him. "Do not risk your life boy." Grinding his teeth, Naruto glared at his demon opponent. "My name is Uzumaki Naruto, and some day I will be the Hokage of this village." "You have high hopes, Naruto. Do not put them to death today." Using his Tajû Kage Bunshin no Jutsu, many Narutos appeared in front of a large white dog.
"So you wish to die." Pouncing upon the clones with his teeth and claws, Sessho narrowed the attackers down to one. "You are out of energy. Give up and I will permit you to live." "Never." Evil Fox, help me out. Red Chakura began to swirl around Naruto's body, taking on the form of Kyuubi. "Demon Lord Sesshomaru. How pleasant it is to see you after all this time." Having changed back into his normal form, Sessho looked upon the demonic Naruto. "Kyuubi. What affiliation do you have with the genin." The rumble of Kyuubi's laughter filled the air. "I am him, as he is me. You cannot defeat the boy, Sesshomaru. For you cannot defeat me."