Au where the biju, Indra, and Asura are all like siblings to each other but when a rift is eventually torn between Indra and Asura everyone goes their own ways.
As the oldest biju, Kurama is the only one Asura confided in. After Asura dies, he becomes the sole living being that knows Indra is an incestuous freak that got angry when his brother was disgusted by his advances and rejected him.
He hates Indra with the force of 1000 suns and holds a grudge against the whole Uchiha line for it. A grudge that only gets worse when Kurama realizes both brothers are actually reincarnating.
The soul of Indra just keeps getting romantically obsessed with the soul of Asura! It’s ridiculous. It’s alarming. It makes Kurama terrorize the Uchiha for hundreds of years so long as Indra’s soul walks the earth as he chases them across fire country to get them away from his normal older brother’s family.
But a giant fox has to sleep eventually. He just never imagined Indra’s spawn would have the fucking audacity to set up a whole clan compound across the river from a senju compound and then go to war with them over their “sacred lands.” Yeah right. He just can’t raze the whole place to the ground like normal because he would be hurting Asura’s too. Best believe they’d be terrorized all over if the senju left.
Kurama is in a very very bad mood. It gets even worse when he feels this version of Indra be born before Asura. Big brother again, eh? Fucker.
At least there’s the river and the war keeping them away.
Oh you got to be kidding!!!! They’re friends!?!?!
He’s in an even worse mood when he gets fucking shoved in a seal.
By the time a goddamn Uchiha tears him out of another seal, tries to control him, AND he gets shoved into a little Asura he’s apocalyptic. He fucking smelled Indra’s soul print while he was rampaging.
And he can’t even do anything about it.
Maybe it’s time for a more hands on approach with Asura instead of Indra. Yes…yes that’d do quite nicely.
Cue biju lead training montage where Kurama teaches Naruto how to protect himself against Indra level threats, Naruto finds a family in one protective fox, and the secrets behind the Uchiha massacre are uncovered bc Kurama insisted itachi was innocent
Of course he meant it in a “being brothers with the reincarnated wannabe brother-fucker would drive anyone to kill the whole family” instead of “he was ordered to do it” but eh. Got them to the same place.
That place being Itachi is the Only Good Uchiha and Naruto getting with him would piss Sasuke off so bad it’d reverberate through his souls for generations.
Of course Kurama wanted them together.
Itachi, for his part, never expected his crow stationed in konoha to bring him another assignment after the third hokage died. They both had an understanding that no one else was to know. But apparently, Tsunade somehow found out and wants his intel.
When he gets his next assignment, there’s a letter attached drenched in warm chakra that feels like sunshine and a konoha breeze. Itachi tries to ignore how desperately he latches onto it.