From the Root's Special Research & Development Division's experimental records:
Project: Gozu Tennō.
Lead Researcher: Shigaraki Tanuki.
Though the Third Shinobi World War ended in the Hidden Leaf's victory, the devastation wrought by enemy Tailed Beasts across the frontlines made it painfully clear to the village's upper echelons that our side stands at a grave disadvantage against the other Great Villages in one crucial aspect.
Owing to the intractable nature of both the Demon Fox and its Jinchūriki, and to the Lord Third's unwillingness to relinquish the weapon to the Root, the village remains without a sufficient deterrent to ward off further large-scale invasions, despite its relative numerical superiority in high-tier combatants.
Finding this state of affairs to be unacceptable, Lord Danzō ordered the creation of an ultimate weapon to surpass the Tailed Beasts.
Employing a sample captured during the Second Shinobi World War from the pseudo–Tailed Beast that powered the Land of the Sky's ultimate weapon, codenamed Zero-Tails, and using the First Hokage's cells as a foundation, we have succeeded in cultivating a so-called yōkai embryo, in collaboration with Lord Orochimaru.
Just like its parent, the Zero-Tails, the yōkai embryo can feed upon the darkness in the hearts of nearby sentient beings, moulding potentially limitless quantities of dark chakra, given enough time. When placed within a sealed, pocket dimension created by a special Fūinjutsu, the weapon will remain dormant for as long as necessary.
Once the seal's holder is sent into the heart of enemy territory, the yōkai embryo will begin to absorb the negative emotions of both its carrier and those around them, amassing power. When the time comes for the weapon to be activated, it will mature into the enemy's worst nightmare, shaped by the types of emotions it has absorbed.
At that moment, the weapon will unleash its full power, wreaking devastation and sowing unrest across the enemy's Great Village, drawing attention away from the frontlines…
…
Without warning, a great shockwave tore through the courtyard at the heart of the Village Hidden in the Cleavage, the rush of displaced air hurling a bunch of unlucky villagers in every direction and knocking the rest flat on their backs. At the same time, a dense shroud of smoke settled over the area, veiling everyone's sight in pure white, roiling clouds.
Panic immediately set in among the non-combatants, and even the Manyū clan's trained kunoichi struggled to find their bearings.
Where had the attack come from?
Where was the enemy?
Whom should they turn their blades against?
The answer came swiftly, in the form of a pair of great yellow eyes glowing behind the veil of smoke like searchlights— eyes that filled with terror all who met their baleful gaze…
…
Sakura shook her head, dazed.
She had been blown off the execution platform and dropped down nearly two metres, landing painfully on her chest, which had absorbed most of the impact. Luckily, she was more shocked than truly hurt.
Sakura strained to get to her feet, but in this position on all fours, even with her arms fully extended, her chest still rested against the ground, making it difficult to push herself up any further, especially with all the extra breast flesh weighing her down.
"Kakashi-sensei!" Sakura shouted, still slightly shaken from the blast. "Naruto? Sasuke! Where are you!?"
So what if her breasts were nearly twice as heavy as they had been a minute ago? Though she had absorbed little more than a thimbleful of Lady Tsunade's breast chakra, she had inherited a fragment of her natural super-strength. Not enough to raise her all the way to a five like Lady Tsunade, but enough to push her strength stat from a three to a three-and-a-half!
Adrenaline flooded through her veins, and she rolled herself onto her back with difficulty.
"SHA!" Sakura roared.
In one fluid motion, Sakura curled up onto her upper back, pressed her palms to the ground beside her head, tucked her legs in, and pushed up with her arms, kicking out with her legs and leaping to her feet in a rising handspring!
"Ja-jaan!" Sakura sang victoriously.
Attempting a kip-up lying on her belly would have been asking a bit too much of her…
"LOOK OUT!"
Sakura barely had time to react before a familiar blondie hurtled out of the smoke straight towards her, shattering the wooden execution platform and landing nose first in her cleavage and knocking them both to the ground— another in a long line of times she had ended up flat on her plush behind.
"Oof!" x2.
And now she had to haul herself back to her feet, all over again.
"Get out of there, Naruto!" hissed Sakura as she grabbed him by the collar and fished him out from between her mounds. "Oh, hang on, you're hurt— Mystical Palm Jutsu!"
There was a large bruise on his cheek, and his eyes were spinning. Something very large, very strong had just carelessly slapped him aside.
"Boobies," said Naruto dizzily. "Huge… boobies…"
"Get your mind out of the gutter, Naruto," said Sakura worriedly, bathing his cheek in soothing green chakra. "Did you get a good look at the enemy…!?"
Sakura's voice trailed off as a shadow fell over her.
"Huge…" she whispered, eyes widening as she glanced up.
The summoning smoke was rapidly dispersing, and just as Naruto had so aptly described, an enormous pair of melons hung right above their heads. Enormous, though, was a gross understatement. Sakura's pair— though very nice— were enormous, but these? These were positively mountainous, each breast bigger than the nearest house!
Rather than Project: Gozu Tennō's yōkai embryo manifesting as a Nue— a chimerical creature with the head of a monkey, the limbs of a tiger, the body of a tanuki, and a snake for a tail— it had matured in the form of a Grecian Sphinx. Unlike its Egyptian counterpart, which had the body of a lion and the head of a man, this monster also bore a bird's wings and a woman's head and bust atop the lion's body… which naturally included a massive pair of tits (not the bird).
Thankfully, the monster was so immense that it hadn't trampled anyone upon its summoning; the crowd gathered to watch the execution had congregated in the centre of the courtyard, far from its four paws. However, if it chose to lie down, they would all end up flattened…
"Kagefusa…?"
Naruto and Sakura craned their necks to look up towards the source of the voice. The monster had stopped moving— it was staring intently at the patriarch on the balcony…