Hello! This is set somewhere in season 7 or 8 of Shippuden, enjoy!
Chapter One: Wake Up Call
The blonde ninja's blue eyes fluttered open slowly; he stared at the ceiling as he lay in his warm bed and lazily rolled onto his side so that he could see the sun rise outside the window. As he watched the round yellow orb move into view his eyebrows knitted together and his lip curled in confusion,
"Huh?" he mumbled…
The 'copy-ninja', as he was known, sighed once more in his sleep and rolled slowly onto his stomach. He smiled sleepily under his dark blue mask and continued to dream…
Rooftops. That's what it was. The rooftops were different to what he usually saw out of his window. Was this some sort of genjutsu? Was someone attacking the village? Negative: there was nobody screaming and he couldn't feel any unusual chakra within Konaha. So why was the view so different?
He scratched the straw mop on his head and sat up before swinging his legs over the edge of the bed. With one ungainly movement he stood up, stepped into an empty carton of ramen and stumbled across the minefield of junk and food wrappers that was strewn across the floor. His hand slapped against the wall as he balanced on unsteady legs and he stood staring at his reflection in the full length mirror,
"Huh?" he repeated…
A bird crashing into the window caused the Team 7 sensei to sit up like a striking snake. His dream fizzled away into his subconscious and he slapped his hand to his chest to calm his racing heart. It wasn't the wake-up call he'd wanted and he flopped backwards onto his pillow. Five more minutes was his last thought before almost immediately drifting back into his dreamland…
"This is bad," the jinchuuriki moved his face closer to the mirror and opened his mouth wide, as though being examined by a doctor. He then pulled at his cheeks whilst staring intently at the three whisker-like markings on either side. His bright blue eyes moved down to inspect the rest of his body; he was naked but for a pair of luminous (and quite ghastly if he did say so himself) briefs.
"Naruto, you are one scrawny kid," he whispered to himself. Suddenly his expression darkened, "Wait… If I'm here then that must mean…" Without another word he quickly got dressed and zipped out of the apartment in a blur of orange…
A loud BANG! startled the grey-haired sensei out of yet another peaceful dream. His droopy eyes, one covered by a long, thin scar, crept open only to find someone rather surreal sitting on the edge of his bed: himself.
"AARGH!" Kakashi yelped and rolled backwards off of the bed. He peeked over it as he remained kneeling on the floor, "W- Why are you me, dattebayo?"
"Naruto," the visitor, who looked and spoke like Naruto, spoke slowly with his palms outwards, as though talking to a wild beast. He smiled with Naruto's mouth and said softly, "It's me, Kakashi."
"What?! You look like me!"
The man wearing Naruto's body sighed, "And you look like me," he picked up a mirror from a chest of drawers and handed it to the real Naruto.
The younger ninja, who somehow looked like his sensei, grabbed it from him and stared at his reflection. He gasped and looked back at the real Kakashi, a little calmer now,
"Can't we just change back?"
"I already tried, its no use," Kakashi sighed in Naruto's skin, "And I don't think we just changed into one another, I think we actually swapped bodies."
Naruto's response was silence. He held up the mirror again and stared into it intently. He really did look exactly like Kakashi, and Kakashi like him. It was freaking him out and yet he still had time for one rational thought; his hand crept up to the mask that covered the lower half of his face and he hooked a finger underneath it. He was about to pull it down when a firm grasp stopped him,
"Don't just go gawking at other people's bits!"
"It's not your bits! I'm not a pervert! This could be my only chance to find out what you look like, dattebayo!"
The stern look on Kakashi's face (or Naruto's as it was) was enough to chill the youngster's bones and so he dropped his hand and folded his arms across his chest, "Besides, how do you know we swapped bodies? This could be some sort of genjutsu!"
Kakashi's expression softened and he looked a little worried, "Because I think I can feel the Kyuubi inside of me."