The Nine-Tailed Guardian
I don't even live in Japan (yet), and, as such, i own neither Naruto nor Final Fantasy.
Summary:
Naruto is accidentally transported to Spira (Final Fantasy X) while attempting to master the Hiraishin no jutsu, and decides to accompany Yuna as a guardian. Fem. Kyuubi is benevolent, if a little bloodthirsty.
Naruto x Kyuubi.
Naruto sighed tiredly. No matter how hard he tried, all that happened when he attempted the Hiraishin was that he succeeded in making himself look incredibly stupid. Not that he minded, but it was frustrating to have gotten almost nowhere after three years of training. Without the Fox's help, he probably wouldn't be able to stand right now. "Alright, once more!" going through the complicated hand signs, he prayed that it would work this time...
Yuna frowned. There was some sort of weapon on her bed. She was sure she'd never sealed her door, how on Spira did it get there? She decided to go ask Lulu if she could identify it. As she reached over to pick it up, she was startled to see a young, orange-clad boy appear in front of her, grin, and collapse.
A few hours later
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Naruto opened his eyes to find himself in a dimly lit hut, with no idea where he was, and very little on how he got there. "Hey, fox, do you know where we are?" He got no answer, which freaked him out a little, as this had never happened before. Closing his eyes, he retreated to a place deep within him, where he could see a large cage, the dwelling of the Kyuubi. As he peered within the cage, he could just barely make out the form of a humanoid body, which appeared to be sleeping in the two or three inches of water that covered the place. Hesitantly, he slipped between the bars, to figure out what was wrong. As he approached the body, he discovered something that, quite literally, took his breath away.
The sleeping form before him was not, as he had expected, a fox, nor was it a man; Kyuubi, the nine-tailed fox, the most destructive force known to man, was female.