Disclaimer: I don't own Naruto, really I don't.

A/N: There isn't enough Oro/Naru fanfiction, so I will be filling one up.

Hostile Host

Prologue

After being unconscious for how long, Naruto ran as fast as he could towards where Orochimaru and Sasuke are. The newly cursed seal pulsed feeling the dark energy of its master close by. Naruto flinched, placing his hand over it.

Please, I hope I'm not too late. Sasuke don't go to that bastard. Naruto chanted, shoving the door open to see Orochimaru entered Sasuke's body. Sasuke's body recoiled, releasing a bloodcurdling scream throughout the hollow chamber. Naruto stood there, shocked and betrayed. Sasuke collapsed, Naruto rushed over to check his friend's condition. A chuckle escaped out of Sasuke's lips, slowly evolved into an evil laughter. There, Naruto saw was yellow snake eyes.

Naruto gasps sweat trickles down his hot face. The irritating cursed seal flashes malevolently. Ever since Jiraiya and Kakashi died during the rescue of Sasuke and the battle of the Akatsuki, no one was able to seal it. Tsunade doesn't know how to seal it, Kunenai tried but got repel by the evil energy. Taking the nearby handkerchief, he wipes his forehead. Slowly making his way to the bathroom to get wash off and get his monthly check up with Sakura.

He licks his dry lips while took his toothpaste and toothbrush in hand. The green paste ooze out of the tube onto his toothbrush, he put the object away, brushing his teeth. He reminisces the event that happened when he came back.

"Naruto are you alright?" Tsunade hug him, tears erupted from her eyes. She was afraid that he would die.

For the first time, he woke up from his trance. He noticed that Tsunade was sobbing on his shoulder hesitantly he embraced her back. "I'm fine, but..." Sadness leaks into his broken voice. "...I failed Sakura, Kakashi-sensei, Ero-sennin, me and more importantly Sasuke."

"You gave your all, I'm sure they will appreciate your effort." Tsunade reassured, grabbing his hand.

Naruto pulled away his hand. "I don't think so."

Naruto drop on his knees, grasping the cursed seal on his neck. "Fuck." Black marking provokes itself, spread over his body. The hot water splashes on his burning skin, the pain grew, his craving grew. Bastard, get out OF MY MIND!!!

By sheer will, the black marks swirl back into the three markings, his burden. Lately the seal itself has a mind of its own, whenever Naruto isn't involve with a fight it activates. When it does, Orochimaru taunts in his mind, mocks him.

Naruto shut the water off, quickly dressing himself up. He needs a distraction badly. He disappears into a green-orange blur.

Sakura frown, she looks at the result again. She glances at her friend, before pondering how his condition gotten worst. "Naruto, I don't know what to say. Your brain is being damaged by the cursed seal, if it continues, you might end up like..." Naruto knew what she was going to say.

Sasuke...

Naruto's fist tighten, his knuckles were turning white. Despite his anger, he nods calmly. "Thanks Sakura-chan, I'll be going now."

"If you need anything, I'll be there to help you." Sakura spoke, clutching her heart. She can't lose Naruto. She have already lost Kakashi, Sasuke and Sai. She doesn't want to lose more friends, her teammate, her precious people.

Naruto smiles, giving her glimpse of the younger image of Naruto who promise he will bring Sasuke back. "Thank you Sakura-chan, I understand." He said softly.

The last string of his ramen noodles suck into the blond's mouth. He sighs gratefully, content that his hunger diminished. He turns off the light, putting on his nightcap before slipping into his bed. A shadowy figure caught his eyes, swiftly grabbing his kunai. He would care less if he isn't in his clothes, just killing the enemy was the first objective. The enemy jumps near his windowsill, silently opening the window. Naruto dives into a fight, ignoring the burning of the seal on his neck. What surprised him was two sharingan eyes gazes into his eyes. "Sasuke..." Naruto whispers breathlessly.

Rapidly, the markings spread over his body. He clenches his teeth, holding his scream back. That snake bastard's voice is louder than before. The figure approaches, the moonlight glow on his enemy's face to realize a familiar pale man with spinning sharingan eyes. "Tsk, Naruto-kun. You shouldn't have resisted my gift, after all you have the honour to be my new container."

Naruto growls, hell he is going to. He can't leave Sakura alone after all she has been through. "Hell no."

"You haven't got a choice Naruto-kun. You are mine either way." Naruto passed before Orochimaru said anymore.