Naruto was stumbling back to his apartment a battered and broken young boy. It was October 10th and once again he'd made the mistake of going out to try and get some food. The mob hadn't taken long to find him, and then the pain started. He'd thought he would have died when the Bear ANBU came in and saved him.
Staggering up the stairs, he barely made it his floor, when he noticed that his door was open. It seems that today there was more than one mob, one had been here, while the other beat him up. Now it was time to see the damage they'd done. Pushing his door open, he found to his dismay that they hadn't just torn everything apart and made a huge mess of his place, but they'd also broken a wall open.
Stepping gingerly around, he looked at the destroyed section of the wall and sighed as heavily as his young frame could manage. He'd have to set about fixing it later, but for now something else caught his interest. There was a small box inside the wall.
Curious he pulled it out and looked at the note on top. "The Power to Change the World."
Smiling he felt he needed that right now, something to make his world a lot better, so like any child with the answer to their problems in their hands, he opened up the box, and found... slimy looking multi-colored orbs. Sighing again he set the box aside, and accidentally spilled one out, to roll across the floor and hit his foot.
At first he thought nothing was happening, until the orb shot out tendrils up his legs and began spreading its off white color over his body. While that happened, he felt a strange warmth building deep in his body. No matter how much he struggled against the stretchy, sentient goo, it continued coating his body until he was covered head to toe in a shiny off white color, with orangish tips on the ends of his nine tails.
As this information processed through his mind, he found himself looking into a mirror, seeing the red orbs that had once been his eyes flicking under his fox ears and an explosion of hair streaming back off his head. Reaching up with his hands he ran his fingers through the hair and smiled at how soft it felt, in fact all his body felt like it was covered in downy fur. That's when a voice deep inside urged him to speak.
"I am Kyukon..." he said calmly with a mischievous twinkle in his eyes. "I have chosen Naruto as my host, and soon my family will join us in defending Konoha... our new home."