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Space time Jutsu are....tricky.
Technically, they are possible. But that doesn't mean much, when technically anything is possible if you can figure out how to do it. Sometimes, they turn out well; the Hiraishin is a famous example of extensive research, testing, and hard work making a functional Space Time Jutsu.
Even the Hiraishin was dangerous, though, and it was created by a genius working at their own pace with dozens of checks and balances.
Their jutsu, however, was a desperate gambit that was so rushed that they didn't even bother to name it. No backup plan, no protections in place, and only the slightest idea what they're doing.
But It was the end of the world; what did they have to loose?
Time. They had time to loose, apparently. Not that they knew that; not that they ever would.
It was the end of their world, of life as they knew it, but it wasn't the end of the universe. It wasn't the end of everything.
Until it was, and they accidentally ended time as they knew it.
Turns out, sometimes messing with the fabric of space-time is bad, actually.
--
"This is a bad idea." An pale eight year old that was fading closer to albino by the second reasserts one last time, rubbing irritably at the scales(? Maybe more like 'cracks', but scales sounded cooler) that were quickly covering the right side of his body. They didn't hurt, really, but they....buzzed? They felt weird. Like his not-quite-a-headadache.
Actually, that's probably the word he'd use to describe everything about this situation; weird. Even the dully (and newly) dubbed Urusai didn't argue with that, and they argued with everything.
"No, it's not." His best friend insisted, squeezing her hair to try and get rid of the water in it for the third time in as many minutes. It worked, technically, but then Nureta (or whoever it really is) apologized again, and she almost-stumbled with another small burst of guilty chakra and she was soaked. For the third time in as many minutes. This sucked. "Just give him your puppy dog eyes!! No one can resist those, and anyway he loves dogs!!" She claimed confidently.
The boy frowned. That didn't sound right, but he didn't know enough about dogs to dispute it.
"But my eyes are all....WEIRD, Now." he shook his head, and then almost fell over; the new weight of horns on his head disorientated him. "I can't do puppy dog eyes!"
"Well, I can't do puppy dog eyes." She shrugged, "Especially not like this. So you gotta. C'mon, it's not the eyes that matter, it's the intent. It's not the eye in the puppy, it's the puppy in the eyes. Duh."
He wanted to keep arguing, but then she knocked on the door, effectively cutting off any further argument.
There was some shuffling from within the house, and then the door flew open and he expertly pouted his lip, teared up, started trembling pathetically, and started talking.
--
"Hey can you let us lay low at your house?" The freak at his door asked, voice wobbling with tears, and Kakashi didn't even blink. He was having a really weird day; he honestly couldn't muster the will to be surprised.
First, he woke up and found out his dad was on an emergency mission; nothing too weird there. Then he summoned his puppies so that they could help him get on the counter to look for food, but instead he passed out from chakra exhaustion. When he woke up he had eight ninken instead of two, and his eye really really hurt. He went to a mirror to see what was wrong with him, and saw that, somehow, his left eye had turned red and black and was bleeding.
He was planning to wrap his eye up and maybe find the energy to see if Pakkun had any idea what was going on, but then there was a knock at his door and he was faced with two demons, and he was trapped somewhere between not caring about anything and wanting to cry on the spot, but he wasn't surprised. This might as well be happening.
"We got weird eyes and voices in our head and Rin doesn't think you're a snitch?" The duel-eyed boy continued with a sniff, when Kakashi didn't respond for a while. He really didn't know what to say.
"Uh. Speaking of eyes." He tried, going through the pain of opening his left eye that he hadn't tried to open since he saw it in the mirror. The demon boy had the exact same eye, though, in his right eye, so maybe he could help.
"WHAT THE HELL YOU TOO??" the boy yelled, staring at Kakashi's red-black eye with the same confused-wonder that Kakashi had to imagine he was staring at the boys with, and he sighed with the effort it took not to sniffle and start crying. He was so confused.
"Me.....too?" He asked, and the demon just looked frustrated, but the girl Kakashi barely noticed spoke up. He flinched when he looked at her, too; she had red ringed eye-whites and yellow eyes, and she looked really familiar. There was a puddle of water forming on his porch below her feet, slowly but steadily.
"Your eyes." She clarified uselessly. "Or....Eye? It's all red and black like Obito's. Or. One of Obito's."
"Yeah, yeah, what the hell Bakashi? Where do you get off getting the sharringan before me? You aren't even an Uchiha!" The demon stomped his foot, and scary-eyes put a consoling hand on his shoulder. His shirt instantly soaked through where she touched him.
"You have the Sharringan, Obito." She reminded the pouting demon boy, "And your other eye still looks much cooler. It's purple." She said, like that was the highest compliment she could pay something.
Maybe it was, because the boy brightened up instantly, and Kakashi closed his left eye again; his headache was getting bad again. He sniffled, but neither of them seemed to notice.
"Obito....and Rin?" He asked, brow furrowing as he finally placed the names. "From class?"
"Yeah!" The boy- Obito??? How?- scoffed, looking offended. "What, are we that forgettable Bakashi?" He asked, and Rin(???????) slapped him.
It was the opposite, really; there were only a handful of people he remembered, from the class he attended for all of all of a year. The Hokage's son that smelled like smoke all the time. That kid that sat next to him and always had a lollipop, even in class. And then these two; the loud Uchiha that never left him alone, and the girl that gave him origami dogs sometimes because he 'looked sad'. Obito and Rin.
".....Fine." He relents, because for some reason the thought of turning them away makes his skin crawl. "My Tou-san should be gone for at least a few days."
"Really?" Obito asked, looking surprised that their plea had worked. Kakahsi might be offended if he wasn't in the same boat.
"Oh, thank you thank you thank you Kakahsi!" Rin cheered, close to crying with relief. Kakashi still couldn't meet her eyes, but he nodded.
"Can you...dry off?" He asked, eyeing her carefully. He didn't want everything smelling like wet dog when his summons inevitably descended upon his guests.
Rin finally broke into tears, absolutely flooding his porch.