It was supposed to be a relatively easy C-ranked mission. Get the scrolls back from the thief. It wasn't a particularly skilled thief, nor was the thief very powerful. So, they sent Team 7, with Kakashi's assurances that he'd make sure the Genin didn't engage the thief in one on one battle. Personally, Kakashi thought that he could just stick Sasuke or Naruto on the thief, and he'd be dead in half a minute, but orders were orders, and the village preferred it's jinchuriki intact, thank you very much.
"This'll be no problem!" Naruto decided, linking his fingers behind his head.
"It very well could be a problem," Kakashi admonished gently. "Keep a lookout."
"Remember what happened on our last C-rank mission?" Sakura scolded.
"Like that would happen again," Naruto muttered, then was rewarded by a good thump on the head from Sakura. "Oww," he complained.
"It very well might," Sakura continued scolding Naruto as they made their way through the forest surrounding Konoha.
"Quiet," Kakashi snapped, looking around. "We're getting close. You three will hang back while I take care of him."
"But Kakashi-Sensei," Naruto whined. "We could take him."
"I'd rather not subject the poor man to you three," Kakashi deadpanned. "He's a criminal, but I'm not that mean."
"Hn," Sasuke grunted.
"Stay here," Kakashi ordered, surging ahead.
"Like heck we will!" Naruto said, attempting to keep his voice down, and charging after his Sensei. Sasuke charged after him, Sakura following after a moment of hesitation. Kakashi internally facepalmed, but continued, allowing the genin to charge after him quietly.
"I know you're there!" The thief shouted, standing in the middle of the clearing, his hands in a dog hand sign.
Kakashi walked out of the brush, hands where the thief could see them. "Don't want to do anything we'd regret, do we?"
The thief barked a laugh. "They sent Copy-Cat Kakashi after me? I suppose I should be flattered."
"They sent us too!" Naruto barked, jumping out of their hiding place, and thoroughly blowing it.
Kakashi resisted the urge to whack his head against the nearest hard object, and sighed. "Naruto, what did I tell you?"
"Not to jump into battle," Sakura lectured, stepping out of the bush and hitting Naruto on the head.
"Hand over the scrolls, and they might consider not killing you," Kakashi said calmly.
"Au contraire," The thief said, grinning wolfishly. "Go back to Konoha, and we won't find out what these scrolls can do."
"You wouldn't," Kakashi growled. "You don't have the chakra to do such a large jutsu."
"What could you know?" He scoffed.
"I can sense your chakra, and you don't have enough of it to make two shadow clones, let alone a big jutsu like that," Kakashi's voice remained without emotion, and the small part of his face that was visible showed no emotion either.
"I'm not listening to you!" He announced.
"I can see that," Kakashi said mildly. "But if you die from chakra exaustion, it's not our fault."
Naruto opened his mouth to ask a question, but Kakashi slapped a hand over his mouth before he could say anything. Kakashi leveled a glare at him, and Naruto sighed slightly, slumping.
"Shinwa-jō no hen'yō jutsu!" The thief cried, making the snake hand sign.
Another voice from behind them called, "Chakurasuitchi jutsu!"
All four shinobi covered their eyes, the bright flashes from both jutsu searing their eyes, even eliminating Sasuke's sharingan. All four experienced extreme pain, bringing even Kakashi down. Sakura passed out first, followed by Sasuke, Naruto, then Kakashi. While the four of them lay unconscious, the two thieves escaped, both of them nearly exhausted from the massive drain on their chakra, and knowing they couldn't take on a single genin in their state.
Naruto came around first, the healing of the Kyuubi coming into play. Ninja skills jumping in, he jumped up, looking around, then he nearly fell over due to his center of balance shifting. Something was very wrong with his back. He leaned against a tree, rubbing his aching lower back, and encountering something fluffy and soft. He let out a rather strangled squeaking noise, twisting around to try and get a look at whatever it was. Nine fluffy tails. He had nine fluffy tails! WHAT?!
After he'd panicked for a couple seconds, he realized how cool it was. HE HAD NINE TAILS.
After he'd finished freaking out about how cool it was to have nine fluffy tails, he glanced over to his sensei and the two others on his team. Kakashi and Sakura had tails too, but only one. Kakashi had what looked like a pair of ears on his head, and Naruto carefully worked his way over to Kakashi to poke at them. Sure, Sakura had them too, but hers were smaller. Kakashi's were all tall and pointy.
Kakashi awoke to a weird sensation of someone poking his ears. He caught the hand, startling Naruto, who'd been crouching by his head. Kakashi mock glared at him, then noticed the pair of kinda fluffy ears almost hidden in Naruto's blond hair. He decided not to comment on it and instead glanced at Sasuke, who wasn't really visible except for his feet and a bit of his hair, which poked out of a burrito of feathers. Sakura had a tail, he noted, and a pair of pink ears lying neatly against her head, almost blending in with her hair.
"Naruto, what's going on?" Kakashi asked, as soon as he was sure his voice wasn't going to crack.
Naruto rubbed the back of his head. "I dunno, I woke up with nine tails! You have one too!"
Kakashi twisted around to try and look at his back and spotted it. It vaguely resembled a wolf's tail, a sweeping plumb of light grey fur, the same color as his hair. It twitched, and Kakashi nearly jumped. Oh dear Kami, it moved. It was attached to him.
"Dunno where Sasuke-teme went, all I see is you, Sakura, and that bundle of feathers," Naruto continued chattering as he went over to the bundle of feathers, his nine tails dragging behind him.
Sasuke was not happy to be woken up. He was warm and felt safe. Then someone just had to go and poke him. He moved what he assumed to be his blankets aside, blinking at the bright sunlight, then as his vision cleared, he was blinking at Naruto. Somehow, the dobe had managed to sprout ears over… wait. He glanced at the sky. It was afternoon, and he'd been asleep. How did that happen?
"Good morning Sasuke," Kakashi's calm voice said. Sasuke glanced over, first registering the grey ears, which twitched, then the same color tail, which Kakashi was absentmindedly stroking as he read his book.
Sasuke blinked. "Hn."
"You could at least say good morning back, Teme," Naruto grouched, moving back over to Kakashi, and giving Sasuke full view of all nine of his tails.
"Hn," Was Sasuke's only reply as he glanced around. Sakura, the useless fangirl was curled up in a little ball, pink ears lying against her head, and just as pink tail curled around her.
After a minute of sulking and picking dirt and twigs and stuff out of the fur of his tails, Naruto walked over to Sakura, poking her tail.
Sakura also wasn't happy to be woken up, glaring at Naruto as she uncurled from her position, stretching and yawning.
Naruto froze as Sakura opened her eyes, one of them the glaring red of the Sharingan, the other the pretty jade her eyes normally were. He backed up abruptly, almost running into Kakashi, who glanced up, and spotting Sakura's new Sharingan, froze.
"Is something wrong, Kakashi-Sensei?" Sakura asked, tilting her head.
In answer, he handed her a shiny kunai. Apparently, she hadn't noticed the tails and ears, or Sasuke's new pair of wings. And apparently, Sasuke hadn't noticed his own wings.
Sakura looked at herself in the kunai, shrieking like a banshee when she saw the Sharingan. "WHAT HAPPENED?" She shouted. Then she noticed the extra additions. "Naruto, why do you have tails? Kakashi-sensei why do you have a tail? Sasuke-kun! YOU HAVE WINGS!"
Sasuke actually started when she shrieked, then when she pointed out his wings, he twisted around to glance behind him. Sure enough, a pair of massive black feathered wings were draped limply behind him.
"Sakura, you might want to think about closing that eye," Kakashi noted. "It uses up chakra fast."
Sakura immediately closed the eye, the glaring red disappearing as she adjusted her forehead protector to cover it, much like Kakashi did. Said Jonin pulled up his headband, opening his eye to show a normal eye, the same color as his other one.
"And Sakura-chan, you have a tail too!" Naruto offered.
Sakura freaked out anew, looking down and finding her tail. She looked ready to scream again, but Kakashi caught her eye and shook his head.
Naruto sat back down next to Kakashi, figuring that if he said something stupid, Kakashi-Sensei was the least likely to hit him. He began picking out twigs and stuff from the fluffy fur of his tails. He'd have to figure out something so his tails didn't drag in the dirt. He wondered if they moved. As soon as he thought of it, the one he was working on twitched, nearly scaring him out of his mind.
Across the clearing, Sasuke was going through the same thought pattern, but with his wings. Did they move on their own? Answer, yes. Could he stand up? Not quite, he kept over balancing backward. Eventually, he got used to it, and realized, the wings were fairly heavy. At least as heavy as a backpack full of paper. He supposed that should be obvious, after all, they were massive and covered in feathers. The feathers were soft, as he had discovered after plucking a stick from one of his wings.
Sakura decided this was the worst day of her life. She had sticks and mud in her hair, and she'd suddenly lost her normal ears, as she had discovered while trying to tuck her hair behind her ears, plus she had a tail and apparently, her ears had relocated to the top of her head. Luckily, Sasuke hadn't changed too much, just the massive and shiny, black wings.
Kakashi, couldn't care less. Sure, he now had a tail, and his ears had been relocated, but since when would that bother an ex-ANBU. Also, the tail was soft, and it felt kinda nice to be running his fingers through his fur. His cute little Genin were mildly freaking out, Sakura in distress from her random Sharingan, and the tail, no doubt, Sasuke still trying to stagger around the clearing, balancing on trees as he figured out how to walk with the sudden weight on his back, and Naruto relatively calmly cleaning one of his tails, jumping slightly whenever it twitched. Kakashi could feel his ears twitching towards each new sound, but he paid no heed to it, instead deciding to leave his students to their own devices while he waited for them to calm down so they could head back.
Naruto decided after he'd finished cleaning his ninth and final tail, that he was going to try and move each tail on its own. He twitched each tail in sequence, numbering them as he went through them. After a bit he felt better enough to stand up, glancing at Sasuke, who was slowly making his way over, using trees as support.
"Aww, can't walk on your own?" Naruto said patronizingly.
"You try having these on your back," Sasuke snapped, gesturing to one of his wings. "They're heavy."
"So are these!" Naruto protested, all nine of his tails moving around behind him. "Hey! I got mine to not be dragging on the ground first! Hah!"
Sasuke glared at Naruto as he continued, going from one tree to another.
"Maa, maa, no arguing," Kakashi said, turning a page in his book.
"Are we going to go after the thieves?" Sakura asked, playing with the end of her tail. "They've probably passed out with chakra exhaustion by now."
"We're going back to the village and reporting," Kakashi said firmly. "We'll go after them afterward."
"R-right," Sakura said, still fiddling with the end of her tail. "But, um, won't it freak out the civilians more then usual if we just go walking in?"
"I'm sure we'll figure something out," Kakashi said with fake confidence.
"They already think I'm a monster, why would it matter?" Naruto asked, looking away and fiddling with one of his tails.
(A/N) So, I'm worried I'm writing them too OOC, so tell me if I'm making them too OOC. Keep in mind that this is a weird situation, so every little thing doesn't need to be caught. If anyone's wondering, Naruto's nine tails are the same neon yellow as his hair, but are tipped with white. Same with his ears. Sasuke's wingspan is probably around 17 feet, a bit large, yes, but he'll manage. Kakashi's tail is great, it's a sweeping plume of floofy grey fur, and his ears resemble wolves ears. Sakura's tail and ears more closely resemble cats, her tail sleek and easily hidden under her dress, she could probably could get away with wearing a belt and hiding the tail underneath it. Ears, maybe tying her hitai-ate over them would work. Maybe. And one other thing, Sasuke's shirt back is practically in tatters, and is barely hanging on. Suddenly growing wings is never good for a shirt. For the others, the tails went around the clothes. Ears, I think you can figure that out. The first jutsu: Shinwa-jō no hen'yō jutsu. It translates to Mythical transformation jutsu. The Second one: Chakurasuitchi jutsu. It translates to Chakra switch jutsu.