Really surprised no one thought to do this yet.
Prologue
"Oh, my head."
Kurama awoke in a dark room with a pounding head and queasy stomach. "Where am I?" He began groping around through the darkness and haze of a hangover. Unfortunately for him, the room began to shake violently.
"Ow. Ow. Ow. What is with the bouncing? Oh, thank heavens that stopped." The bouncing had stopped as suddenly as it started.
"HEY, NARUTO!" An unfamiliar voice came from nowhere at an all too high volume.
"OW. Loud," Kurama muttered to himself.
"What are you doing here, Iruka-sensei?" Another strange voice replied, still a little too loud.
"Where are these voices coming from?" Freaked out enough by the disembodied voices yelling at each other, Kurama put his surprise on hold as he turned his head and saw his Yoko form striding towards him. He took a chance. "Yoko, what the heck happened last night?" The last thing Kurama could remember was checking out for the night while he let Yoko take over.
"We may or may not be trapped in the body of a twelve-year-old boy." His silver form replied.
"Dang it, Yoko, you're not allowed to touch the tequila anymore."