OK ok so we have Hashirama who is a 9-tailed fox, in the Senju clan no one has 9 tails like him (symbolizing that his Wood Style power is absolutely OP bla bla). Tobirama is a rare white fox, but it's not like his kind never existed before like Hashirama (just a genetic mutation). Hashirama’s fur is a bit thicker than Tobirama’s.
Madara and Izuna are Tengu (not exactly crows, y'all can google it for more details). Madara looks a bit more majestic and imposing than Izuna. However, Izuna’s feathers are way smoother and neatly groomed, while Madara’s are all spiky and messy as hell, which annoys him to no end. On the battlefield, the Tengu always wear a demon mask, leaving only their eyes exposed.
Basically, the two little brothers are always just a tiny bit behind their anija >///<
About the situation between the two clans:
These guys share the same forest, but they've been beating the absolute shit out of each other for generations just to claim territory.
They could never agree on who gets the river part because it’s packed with fish, which means free food. During winter, the Uchiha Tengus just hibernate and huddle up inside their houses, surviving on stockpiled food and fire to stay warm. During this time, the Senju foxes basically completely monopolize the Naka. But in other seasons, since the foxes are a tiny bit slower than the crows, both sides just constantly clash over it (sorry i dont really know if this make sense or not)
How do I put it uhhhhhhhhh, like initially it was just a turf war, but later on it became pure hatred, so they just kept fighting non-stop, yeah yeah, something like that.
Tobirama in the future: "If we unify the two clans, it will help expand our living area since the war zones won't be used anymore. With the population shortage caused by the war, we can use that empty land, combine it with my farming knowledge to grow crops and fruit trees, and then we won't have to stress so much about food security or hunting."
Hashirama: "Omg I'm so proud of you!"
About IzuTobi's first meet
It was because their older brothers dragged them along (yeh yeh, you're sick of it, I'm sick of it, but I completely ran out of ideas for this sorry). But since the two big bros were hiding their true identities, they used magic to conceal their wings and tails, making everyone look just like normal humans, and they told their little brothers to do the same.
The second Izuna laid eyes on Tobirama, he was down bad. That was pure love at first sight.
Y'all know how crows are obsessed with shiny gemstones, right? Yeah, Izuna fully inherited that trait. To him, Tobirama looked like he was literally glowing - so white, white hair, and eyes like precious rubies, like he was insanely beautiful.
He liked him so much that he didn't even bother to hide it. He immediately marched over, walked in circles around him, tilted his head, and scrutinized him from top to bottom. Since he was only 7 years old at the time, he was super goofy. Tobirama felt a bit uncomfortable, but seeing his older brother completely abandoning him to hang out with a new friend, he sighed, grabbed Izuna by his collar, and asked: "You, name?"
"Ah, Izuna! What about you?"
"Tobirama."
"Tobirama! You're so beautiful. Will you marry me?"
"??? Absolutely not?"
"..." Izuna's eyes well up with tears
Tobirama instantly thought, 'Good lord, who the hell spoiled this brat at home to make him this easy-crying?'
Izuna: "WAAAHHH WAAAHHH ONII-CHANNNNN"
Hearing his little brother crying, Madara immediately rushed over to hug him while glaring daggers at Tobirama.
Tobirama: ... (Okay, now I know exactly who spoiled him)
Madara: "What's wrong?"
Izuna: "Tobirama refused to marry me~!!"
Madara + Hashirama + Tobirama: ...
Izuna: "Onii-chan, buy Tobirama for me please!"
Madara: ... (Never in my life have I regretted spoiling my brother this much)
Before his onii-chan could even teach him a lesson, Izuna already wriggled out of Madara’s hug, ran straight to Hashirama’s legs, and tugged at his clothes: "Hashi nii-chan, can you give me Tobi please? I'll be a very good kid!"
The kid knew damn well he was cute. This trick worked 100 out of 100 times on Madara. So for Hashirama — who desperately starved for affection from his own brother — there was absolutely no way he could resist. He almost accidentally sold his brother out on the spot if it weren't for the fact that Tobirama knew his brother's goofy ass way too well.
Hashirama: "Haha, sure, that's— OUCH OW!!!"
Tobirama: Pissed "Anijia, shut it."
Hashirama laughed awkwardly, knelt down, and wiped away Izuna's tears.
Hashirama: "Right now, I can't give Tobirama to you just yet. You two are still too young. When you're old enough, if Tobirama likes you back, I'll marry him off to you, okay? Good kid, don't cry."
Izuna: ... *nods*
Hashirama: "Here a gift for you."
With that, he used his Wood Style to summon a cherry blossom branch and gifted it to Izuna. Izuna looked at it, then turned his watery, sparkling eyes toward Tobirama, who had been looking annoyed the whole time, as if waiting for him to comfort him too. Tobirama just gave in because Izuna was honestly too cute. He sighed, stepped in front of Izuna, and gently patted his head. Just that alone made Izuna grin from ear to ear lol. (If Tobirama had kissed him right there, he would've probably fainted on the spot lmao).
Uhm, after that, every single time they met up, Izuna always prepared a beautiful gemstone to gift to Tobirama. Even when they couldn't see each other, he’d stubbornly force Madara to pass it to Hashirama just to deliver it to him. And then he just kept rambling about Tobirama non-stop to Madara. Madara was annoyed to death and lowkey started hating on the brat who stole his precious little brother lmao.
How it happened
Uhm but things weren't all fun and games anymore when the two older brothers reached the age to go to war. Madara recognized Hashirama, but Hashirama didn't recognize Madara. He only knew him as a rival on his level from the Uchiha clan, completely unaware that he was Madara. Because if y'all don't remember, the Tengu clan always wear demon masks on the battlefield, while the Kitsune don't.
So from that day on, Madara never went back to the Naka River to hang out with Hashi anymore. Hashi went there every single day to both train and wait for him. Tobirama also stopped receiving those shiny gemstones. But instead of just feeling a void in his heart, he worried about his brother even more. Even though he know Madara is not a bad person and probably had his own reasons... but that was it, he still made Hashirama cry.
Then when it was finally time for both Tobi and Izuna to head to the battlefield, Izuna finally understood why his big bro stopped going to the Naka. Tobirama didn't recognize Izuna either. Because even though his nose could remember that wild grass scent on Izuna's clothes, the smell of blood on the battlefield completely covered it all up. But Izuna faced the biggest mental breakdown of his life, straight up starving himself for days just to process and accept the reality.
He was still deeply in love with Tobirama’s gemstone-like eyes, still loved his white hair, and fell even harder for his fox form which he saw for the first time. But now, he could only watch from afar and keep it all buried deep down in his heart.
On that one day when they were both 24, Tobirama dealt Izuna a fatal strike. It was only then that Tobirama saw the mask slip away, revealing the face he hadn't seen in a lifetime.
At that exact moment, Tobirama felt like the sword in his hand hadn't just killed Izuna — it had killed himself too.
Hashirama tried to comfort him, but Tobi just shut himself inside his lab. A few days later, he rushed out, holding an incomplete jutsu scroll in his mouth as he ran straight into the Uchiha territory. His whole body was covered in mud, completely losing its usual pure white fur color.
He used his nose to sniff out Izuna's scent. Right now, Izuna only smelled like medicinal herbs. It seemed like the clan members were doing everything they could to save him, but he was already on the brink of death. Izuna was already dressed in a pure white shroud, his face covered. Luckily, his eyes hadn't been harvested yet. And luckily, Madara wasn't in the room with Izuna at that moment.
Tobirama shifted into his human form, opened the scroll, and began using his own blood to draw the jutsu formula onto the shroud and Izuna's black wings. Finally, he chanted the spell.
This was a jutsu he had just successfully created based on Reanimated Jutsu, but instead, it used his own soul to patch up someone else's missing soul fragments.
Since Izuna passed away not too long ago, he had only lost half of his soul. Honestly, Tobirama came here fully prepared to trade his entire soul for Izuna's life. He accepted death because he was truly, deeply in love with Izuna. He even left behind a ton of scrolls about unifying the two clans so Hashirama could use them later.
He loved Izuna’s round, teary eyes, loved his sincerity, loved his silky black hair, and loved those gemstones he used to pick for him shining under the moonlight.
After done with the jutsu, because he lost too much blood and half of his soul, he passed out right there on the floor, failing to make it out of the Uchiha territory.
If Madara hadn't walked in the next morning to check and found that Izuna had already woken up, then Tobirama would've been gone for real this time lmao :)))))
Since Izuna woke up first, he carried Tobirama onto the bed. But Izuna didn't look happy at all. The moment he read the scroll, he understood exactly how this soul-complement jutsu worked.
Everyone knows that a yokai's soul is extremely sacred; it has to be completely whole for them to have a better reincarnation next life, or even ascend to Godhood. Losing half of a soul is basically like dying once then after this life, you vanish completely from existence, no after-life anymore.
Izuna explained to Mdr that Tobi was the one who saved him, leaving Madara with mixed feelings. Then Mdr told Izuna that Hashirama had proposed a truce alliance. Izuna stayed silent, seemingly not against it this time.
Right before leaving, Mdr suddenly remembered something and turned around to ask:
Madara: "Oh wait, since you're awake now, what should I do with that coffin I just pre-ordered?"
Izuna: "? Is that even a question you should ask me?"
Madara: "Just kidding. Welcome back to life, my dear Izuna."
A while later, Tobirama slowly blinked his eyes open. Seeing Izuna's furious face glaring down at him, he was kinda confused. He didn't sit up, just blocked his eyes with his arm.
Tobirama: "What? I saved your life and you're still mad?"
Izuna: "You literally threw away your only chance of ever becoming a god?!"
Tobirama: "A god? Who are you kidding, nobody has the potential to become a god except my brother."
Izuna: "But you won't have a next life..."
Tobirama painstakingly forced himself up, then rested his head on Izuna’s shoulder, softly comforting him.
Tobirama: "I was scared I wouldn't be able to find you in the next life anyway. So we might as well just spend this life together. Izuna, will you marry me?"
Izuna: "...I'm still mad at you."
Tobirama smirked mischievously, planting a kiss on Izuna's lips. His white fox tail wrapped teasingly around Izuna's wrist.
Tobirama: "Then once you're not mad anymore, let's get married, okay?"
Izuna's eyes welled up with tears as he buried his face into Tobirama's chest, his black wings completely enveloping Tobi's body.
Izuna: "From now on, don't you dare treat your life so recklessly again."
Tobi: "Got it."
Izuna: "I'll find a way to restore the missing pieces of your soul."
Tobi: "Got it."
Izuna: "I want you to wear the bridal gown."
Tobi: "Got it, anything else?"
Izuna: "...And 5 kids."
Tobi: "??????" (isn't it a bit too early for that??)