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Naruto stared, unable to help himself. He was gobsmacked, obviously unable to process what he was seeing. His face was beet red, blood dripping from his nose, and a tent was being pitched in his soaking wet pajama pants.

Sunlight streamed in from the window, dappling a naked, womanly form. Long, shapely legs were spread apart. Moist lips were blushing, a nub of pink sticking out from betwixt them: a clitoris, engorged in arousal.

Naruto's eyes were wide. His jaw was hanging loose, agape.

He stared unblinkingly, stunned, at the vision of inhuman loveliness before him.

Those eyes, hair, and whisker marks all told Naruto that this was his sister, but he just could not reconcile that notion with the appearance of this gorgeous, impossibly buxom creature sitting in Naruko's bed.

For one thing, she was TALL – six and a half feet if she was an inch. Two meters long from head to toe, and with the kind of curves you only saw in porno mags.

For another: she had horns. Her ears were pointed – looking almost like part of her hair – sticking out from the side of her head. A thin, yellow, bristle-tipped tail curled up from behind her hips, swishing back and forth in the air.

Lastly, and perhaps most inconceivably, she had twice as many breasts as human women were supposed to. Arranged two over two, each boob was one-and-a-half, maybe even two or more times as large as her head. At least two thirds of her torso was covered by those impossible tits.

Put all together, this unbelievable beauty had enough accumulated bosom for two or three porn stars. Naruto also couldn't help but notice that her nipples appeared to be leaking. They were damp, droplets of milk dripping down her chest.

"Wh...what the hell...?" he murmured, disbelieving. Naruto's eyes flitted down to this gorgeous creature's groin, and he saw that her pussy was even wetter, the lips visibly puffy.

This twenty-something looking goddess promptly let out a moo. Not quite a moo like a cow, but also not quite like a human saying "Moo." It was half moan, half communication.

What got Naruto, however, was the voice.

He recognized it.

Oh, it was a bit deeper, but there was no mistaking the aural fingerprint. He knew this voice by heart, had heard it every day for as long as he cared to remember.

"...sis?" he said, his voice shaky. He stared into those eyes, twin blue orbs identical to his own. "Is... is that you?"

He saw a glint of his sister in those lipid pools, a subtle but unmistakable gleam of her essential, inalienable Naruko-ness.

She smiled at him.

"Mmm...master..." his sister's voice – deeper and more adult, but still hers – came out of those plump, rosy, kissable lips, and Naruto suddenly felt like his mouth was full of cotton.

His cheeks burned. It took every ounce of the blond's willpower to keep his eyes screwed onto his sister's, to prevent himself from looking down and ogling his twin.

"Sis..." he murmured slowly, taking an unconscious step forward. "What happened to you?"

Naruko met Naruto's gaze. She was smiling sweetly, even innocently at him. She shifted her weight on the bed, scooting a little closer to the edge – a little closer to her brother. Her breasts wobbled as she moved, immense and flawlessly-shaped globes of creamy woman flesh quivering excitedly.

"Mm... I dunno," Naruko said, clasping her hands and beaming at Naruto. "But it feels good. Did you do this to me, master?" She clapped her hands. "Thank you sooo much~!"

Naruto's cheeks burned. His eyes unconsciously zoomed out from Naruko's face, and he took in the entirety of her surreal, gorgeous, naked form for a third time. His nostrils felt hot and itchy, his trousers growing tight. Blood trickled down his upper lip.

"M-m-master..." he whispered half to himself, looking down briefly at his feet as he tried to get things straight in his head. "There you go calling me that again... but, why?"

He gave her a curious look, gritting his teeth and trying desperately to focus solely on his sister's face.

Naruko blinked. She cocked her head to one side, sticking her lower lip out cutely. Her mouth curved in the faintest and smallest of frowns.

"Why not?" she asked him in return. "I think you're a very good master❤" The smile returned to her face, and she clapped her hands once more, seemingly pleased with herself for coming up with this argument. "You made me feel soooo good last night. Only a master could have done that – MY master!"

And, saying this, Naruko sprang out of the bed and threw her arms around Naruto. There was a fair bit of a height difference between them, now, so this resulted in his head getting sandwiched between her lower two breasts. Her upper rack weighed down on the lower, and completely buried Naruto's noggin.

Naruko cooed, feeling her twin – her master – squirm and heat up in her embrace. She lifted him up bodily, and felt something hard press against her navel. Naruto let out some muffled yelps, but nothing he could have said would have been sufficient to dissuade his sister from what she was about to do next.

Naruto felt a slender, feminine hand begin to slide his pajama pants down. A shiver ran up his spine. He grabbed at his sister's breasts.

She moaned obscenely, and tore his pants off the rest of the way.

... ... ... ... ...

Kushina wondered if she had a fever. She felt dizzy, disoriented as she staggered out of the shower. She stumbled out the bathroom door, scarcely even registering the matter of her own nudity.

Her head was spinning. She needed to lie down.

Long scarlet tresses cascaded down a slender, womanly back. They came to a stop just above the swell of generous yet firm, round and shapely buttocks. Her skin was rosy from the heat of the shower, and she felt a strange tingling all over her body.

Kushina's room was not neat or tidy. It was, in fact, honestly a bit of a pig sty. She had never been much of a homemaker, but she at least tried to keep the house presentable for the kids' sake. When it was just a matter of herself, however, she tended to simply leave stuff where it fell and let her junk pile up – sometimes for months at a time.

Miscellaneous ninja scrolls of every size, shape, and purpose were littered amongst old magazines and dirty laundry. Half-read light novels were strewn across a bed meant for two, pages dog-eared and bookmarked with convenience store receipts. A small garbage can next to her bed was overflowing with weeks of accumulated snack wrappers. Her sheets were halfway off the bed, blankets bundled up messily to one side.

It was a cluttered, disorganized mess. And Kushina's nude form shunted it all aside, the woman flopping down blearily onto her bed. She was still a bit damp, but she couldn't bring herself to care about that.

There was something nagging her in the back of her mind, distracting and perplexing the vivacious kunoichi. It was odd, kind of like that feeling you'd get when there was a word just on the tip of your tongue, but you couldn't think it, couldn't remember what it was. She felt like she was forgetting something... something important.

Kushina buried her face in a pillow, then groaned. A shiver of something cold shot up her spine, as though a brisk autumn breeze had suddenly slipped in between her buttocks. It gave her goosebumps.

"What is this...?" she muttered quietly, flustered and bemused by these inexplicable sensations. Her cheeks felt hot, and they probably looked nearly as red as her hair.

Kushina could feel a tingling in her nether regions. It refused to go away. Her body, which had not been touched so intimately by a man for many unbearable years, was loath to ignore these feelings.

If she closed her eyes, Kushina fancied that she could still feel her son's hands on her bum, squeezing her round, supple cheeks tighter and tighter. The thought of his fingers kneading her pliable flesh, massaging and testing the heft of her buttocks, was almost more than she could bear.

She could still feel his breath on her most private place, hot and heady, his nose and lips rudely abrading her most sensitive parts. A base and lewd part of her mind conjured images of her son going in deeper, tasting her womanhood and pleasuring her in ways that only his father before him had done.

Kushina had to bite down hard on her bottom lip to keep from moaning out loud. One of her hands went down to the subtle bulge of her pubic mound, and she shivered at the touch of fingertips against her labia.

"Dammit, Kushina... this is so fucked up..." she whispered to herself, feeling a surge of guilt as she bucked her hips, loins moistening, stomach twisting and turning, knotting itself up into a myriad of intricate shapes. "He's your son, for crying out loud...!"

But her libido refused to accept this distinction. Kushina was horny, sexually frustrated. Her son's touch had aroused her, and the fires which sprang up from this contact simply refused to sputter out. It felt like a coal furnace in her navel running white hot, belching sparks of shameful pleasure all throughout her lonely, aching body.

Kushina was ashamed of herself, and wanted to refuse her own desire. She wanted to let this die down, preferring to grit her teeth and endure the ache than masturbate to thoughts of her son.

She had her pride, and her principles. She would not give in to these filthy thoughts, this blind, animal lust. He was her son, and she would never think of him in that way.

"Dammit, woman... get a hold of yourself...!" she hissed. Her hand remained at her crotch, gingerly and hesitantly cupping the smouldering hot wetness of her lonely pubic mound.

A whimper escaped her lips, another jolt of pleasure rocketing up her spine. Her entire frame shuddered, wracked with numbing ecstasy. The hairs on the back of her neck stood on end, short and fine, as goosebumps spread over her skin. Her nipples felt hard enough to cut glass.

Kushina moaned. Unbidden, unwanted, an image of her son bending her over the breakfast table came into her mind. She wore only an apron, and he leered lustfully – yet lovingly – at her naked, heart shaped ass.

She could feel his hands on her ass again, but this time there was something else too, something she hadn't felt for over eleven years. It spread her cheeks, and prodded the tight sphincter of her anus. Shivers of humiliating delight raced through her limbs, and it took every ounce of her willpower to keep from crying out in euphoria.

Lips parted, fingers finding their way inside, patience lost and restraint forgotten. Kushina touched herself, whimpering, feeling an unimaginable pleasure building up in her body.

The boundaries between fantasy and reality seemed to fade. Wide, child-bearing hips rocked on the bed, an old wooden frame creaking perilously under the stress. Soft, shapely buttocks slapped together and apart, modestly ample breasts pressing hard into the mattress.

"Naruto... what is this...?" Kushina mewled, her vision swimming. She felt tears in her eyes, hot and wet, tears of pleasure rolling down her cheeks. "Why do I feel so good when I think about you? Son... you've really grown into a handsome boy, haven't you?"

She fingered herself with mounting intensity, fantasizing more and more shamelessly about all the things her children's father used to do to her – all the things, and more, that she now wanted her son to do to her. She was on cloud nine, fondling the swell of her own breasts, feeling the softness of ample mounds a hair larger than she last remembered...

Kushina masturbated while thinking about her son. A voice in the back of her mind said that this was wrong, but she didn't want to listen.

How could something be wrong, after all, when it felt so wonderfully good?

... ... ... ... ...

Naruto was inside of his sister. That was the only remotely tasteful way to describe it.

His manhood was thrust fervently into her pussy, silky folds kneading a hard and throbbing shaft. She was head and shoulders above him now – and then some – in terms of height, but down below the belt Naruto Uzumaki was actually pretty advanced for his age.

A thick rod shoved the sensitive walls of his twin sister's insides apart, spreading her lips, thrusting deeper and deeper into a sopping wet cunt. She was hot, so goddamn hot around his cock that it felt like he would burn up and shrivel away, but she was wet as well, and her moisture spurted out messily between them.

It was surreal. Naruto could hardly believe what was happening. He couldn't actually be having sex with his sister. She couldn't POSSIBLY have transformed into this heavenly vision overnight.

I mean, he'd heard of growth spurts, but this was ridiculous.

Naruko was moaning happily, squealing and gushing as her twin brother fucked her. She was sprawled out on top of him, sliding wide, juicy hips up and down in time with her master's frenzied thrusts. Their bodies smacked together, his face nuzzling into her bosom.

"Oohhhh, master! Master, I love you! Yes, yes, please!" she was saying, obscenely impaling herself on Naruto's manhood. "I need this, I need it oh so bad! Oh, master, YES! You are so wonderful, so generous to let me feel these incredible things! Yes, yes, yes! You are the most wonderful person in the WORLD! Ahh~hn❤"

Naruto got even harder, hearing his sister say such lewd things so loudly. He couldn't believe what he was doing, but at the same time he could tell that it was making her happy. His sister was loving this; she was in heaven. It obviously made her feel good.

...and it would have been a lie for Naruto to say that this didn't also make him feel good. No, indeed, he was enjoying it almost as much as Naruko was.

It was curious. Ostensibly, this kind of thing was WRONG. He and Naruko were brother and sister – fraternal twins, even. Naruto was no pervert, but he had learned enough about such things as what was happening between him and Naruko to know that this wasn't supposed to be done with family.

He was aware of what sex was. With a godfather like Jiraiya, he had naturally come to understand the birds and the bees very well. He would have been considered savvy by adult standards, and for a kid he was practically prodigy.

This didn't mean he was a pervert, however. If anything, his unusually advanced understanding of sexual reproduction and intercourse made Naruto all the more respectful and reserved. He wouldn't be the kind of person to coerce a girl into doing something she didn't want to.

Intercourse wasn't meant to just make men feel good. Women were supposed to enjoy it as well. For all his reputation as a womanizer and pervert, Jiraiya was actually something of a feminist, and he had taught his godson the importance of such things as consent and mutual generosity between lovers.

And considering the way his sister had pounced on him, Naruto felt pretty certain she was giving him her consent. Even though she WAS his sister, he had to admit a slight attraction to the girl – something that had been there even before her unnaturally sudden growth spurt. The fact that she was so buxom and womanly now (with four humongous breasts ripe for squeezing and suckling) only intensified and revived those feelings which had lain partially dormant.

Some people said that twins were the reincarnations of tragically separated lovers. Naruto might not have put much store in such things, but he nonetheless certainly loved his sister, even with as annoying as she could so often be.

He didn't really get why she was calling him master, or why she had horns, cow ears, and a tail, but he also couldn't really bring himself to care.

In the heat of the moment, with less than half an hour left before they had to get to school, Naruto was aware of only himself and his sister.

Not even the lavender-eyed voyeur outside the window caught his attention.