Note: As requested by sandydragon. I assume s/he means some kind of story for the beasts, right? Well, all I can say is that I was pretty surprised by Shukaku's party attitude ("Time to PARTY!") when he came out of Gaara, so... here you go. Oh, and let's pretend that the beasts aren't as unintelligent as the officials say, and also pretend that I'm being consistent with naming the beasts. Yeah.
Warnings: Cursing, drinking, slight violence
Pairings: None. Unless you perceive this as some kind of Shuka/Kyuu?
Characters: Shukaku, Kyuubi
When the Sage of Six Paths ripped the Juubi into ten pieces, ten giant, evil, destruction-breathing-little-balls-of-joy were born into the ninja world.
Incidentally, the few people who weren't praising the Sage's noble actions were busy griping about what an idiot he was. Now they had to worry about ten hell-sent demons scattered all over the place? They couldn't just hope that the one hell-sent demon would keep itself busy with demolishing some other part of the world? But those silly people that managed to notice this drawback were just a whiny minority, anyway. They didn't count.
But that's moving a little too far forward, to when the demons actually scattered and went their separate ways. When the Sage first ripped apart the Juubi, the ten beasts landed in much the same part of the forest, a little disoriented, but already spitting hatred and fire.
"You little shit!" screamed the Kyuubi as the Sanbi landed on its back, pinning four of the fox's tails under its rough shell.
But Sanbi had its own problems to deal with. "Get your damn tentacles out of my face!"
As did Eight Tails. "Get your face out of my damn tentacles!"
...They eventually managed to untangle themselves and go their separate ways.
The Shukaku and Kyuubi went off together in the same direction for coincidental reasons. The Kyuubi soon discovered that the Shukaku was the most laid-back, easygoing monster demon that he'd ever seen. (Granted, Kyuubi had only seen eight others excluding himself, but that's beside the point.) For reasons unknown, the Shukaku simply did not have the single-minded drive to kill and destroy everything in sight.
Therefore, the Kyuubi took it upon itself to make sure that its fellow monster developed a healthy, murderous, hate of all existential objects.
"In the name of all that is destructive, Shukaku! Just go over to that town and grind it to dust!" Kyuubi screamed.
"Why?" Shukaku asked, idly, picking its ear with the tip of its tail.
"Just because!"
"Fine," yawned Shukaku, who then ambled over and ground the town to dust.
"You missed a spot," snarled the Kyuubi.
"I'll get it later," Shukaku mumbled.
At which point Kyuubi slammed its tails against the ground with frustration, effectively destroying the rest of the town on the way.
That night, the two beasts flattened some trees to sleep on, near a major trade city. Kyuubi was trying to fall asleep and rest up for another day of life-crushing destruction, but the nearby city was having a spring festival, and the sound of music and drumbeats carried strongly over to where the two had set up camp. This in itself wouldn't have been a huge problem, but for some reason, the sounds of the festival made Shukaku restless, and the great raccoon paced and hummed in time to the music, keeping the Kyuubi from its beauty sleep.
"Damn it, Shukaku. If the sound is bothering you so much, go pour a mountain or sand on it or something," Kyuubi hissed, already looking back on his decision to travel with the One-Tail and deciding that it was far more trouble than it was worth.
"Alright," said Shukaku, oblivious to the Kyuubi's irritation. And so the enormous raccoon turned tail and perambulated over to the celebrating city.
The Shukaku soon found that it loved the atmosphere of the joyous festival, and flung itself into the celebration enthusiastically, dancing and swigging barrels of sake amidst masses of screaming and fleeing people. Soon enough, Shukaku inevitably noticed that the music had ceased and the people were either dispersing or throwing flaming spears at its head.
"Why?" it cried in confusion and distress.
The distress soon turned to anger. "What the hell is with these spears, you dumbasses? And where did the music go?"
As a small militia continued pelting Sukaku with instruments of war, the beast's rage and unhappiness escalated. "Time to PARTY!" Shukaku roared, sitting up on its heals and flattening city blocks with its lashing tail.
The city was razed to the ground within hours.
Shukaku soon returned to the Kyuubi. The fox awoke and instantly noticed the mad glint in the raccoon's eye.
Grinning, it asked, "So, how did it go?"
"I'm going to go find a party," Shukaku snarled, and stomped off. Kyuubi watched it go, feeling as a proud mother might be of her son.
It is said that Shukaku was sealed into a teakettle by a Sand ninja when the beast later made the mistake of joining in with (read: attacking), the spring festivities of the Village Hidden in the Sand.
Shukaku did manage to go through several platoons of ninja and a few cubic meters sake first, though.