WARNING!: I'm a huge pervert, so this is obviously smut. I'll put a 'tags' warning so you know what I'll be writing about. Don't like? Don't read.

Incest (sexually active with a relative) – The main pairing in this story is Sasuke x Female Itachi. They are brother and sister by blood (obviously), and the story focuses on that bond a lot. If you don't like incest, don't read this story.

Harem (multiple wives/sex partners) – This will be a Harem story. Itachi will build one for her brother, so that they can rebuild the Uchiha clan. And to please him, obviously.

I'll add more when they come, but for now, I think this is good enough.

Idée Fixe

Chapter One – You Only Belong to Me

Uchiha Itachi was many things.

A kunoichi heralded as a prodigy even among the famous (or infamous) Uchiha clan, known as one of the most elite clans in the Village Hidden in the Leaves.

A girl who was able to graduate from the academy in only six months, graduating faster than almost anyone else in the village's history.

A skilled ninja, able to utilize the Uchiha clan's many special skills to a degree that made her extremely dangerous.

Master of the Sharingan at the age of eight. Reaching the rank of chunin at age ten, passing the Chunin Exams by herself, without a team. Entering the ANBU at the age of eleven, and becoming a captain at thirteen.

Uchiha Itachi was the pride of the Uchiha clan, a shining beacon of what an Uchiha should be. The perfect daughter.

It almost made her snort.

It was true, Itachi was an incredibly talented kunoichi, but that didn't mean she was the perfect Uchiha. In fact, she had an extremely scandalous secret.

Uchiha Itachi, nineteen year old ANBU captain, was obsessed with her little brother.

"Nee-chan…" The sound of herbrother moaning in pleasure made her so excited it should have been illegal. She loved his voice when he cried out in ecstasy, which was why she had his sizable (and very tasty) cock in her mouth.

She smiled around his meat, looking up at the brother she loved to pleasure, and sucked harder. The way he bucked his hips at her increased vacuum blowjob gave her warm butterflies in her chest.

So cute, she thought, never breaking eye contact with her little brother. His onyx orbs stared into hers, turning them both on even further. Itachi's Sharingan was activated, swirling drunkenly, carefully recording Sasuke's every delectable expression.

Her hand snaked up his leg slowly, reaching his full ballsack, groping it lightly, making sure not to squeeze too hard and hurt him.

The expression on his face looked pained, but he couldn't fool his nee-chan! She knew he was trying to hold back the quickly arriving orgasm. His transparent attempts at trying to draw this out was so cute that Itachi could hardly hold back from simply jumping on him and riding him until he was dry.

But she managed to stay put, her deep, fast blowjob continuing, much to Sasuke's obvious delight. Her little brother loved his sister's Super Duper Vacuum Blowjob, and that's what Itachi would give him.

"It… It's coming…" Sasuke moaned. His honesty made her hot.

With a naughty smirk, Itachi took the full length of her brother's still growing penis into her mouth, sticking out her tongue and running it over his balls, encouraging a strong release.

The technique proved too much for the fourteen year old boy, and with a cry of ecstasy, Sasuke came right down his nee-chan's throat. His hands instinctively reached for her head, wrapping his arms around it, pulling her close and pushing his dick even further inside.

"Nee-chan…" he moaned into her hair. "Nee-chan…"

He released an impressive amount of semen into her throat, riding the powerful ejaculation as long as he could. Even when he stopped cumming, he kept her from moving, keeping his penis in her mouth for at least a minute.

When the minute passed, he fell back onto his bed, breathing hard, his face as red as the tomatoes he loved so much. Slowly, ever so carefully, Itachi slid the penis she loved to tease out of her mouth, sucking the whole way up, making sure to extract every last drop of semen out of Sasuke's precious urethra.

He moaned as she did this, his expression worth more than anything to Itachi. With a loud, lewd pop, she finally let go of the dick that had been in her mouth for ten whole minutes.

"You're getting better at holding it in, Sasuke-kun," she said as she scooped up the small amount of semen that escaped her mouth and ran down the side of her chin. Then she licked her finger clean of her brother's cum, savoring the taste with obscene moans.

Sasuke didn't respond, still in the afterglow of his powerful orgasm. It made Itachi smile.

His chest, rising and falling heavily, was so cute. She loved it when she could make him feel good. He deserved it, after all. The loss of their entire clan still made Sasuke's heart ache. Itachi knew, even with her ability and desire to pleasure him, Sasuke still despaired for his mother and father.

Locking those thoughts deep within her heart to be opened at a later time, Itachi crawled into bed, kneeling over him.

"I'm very proud of you, my little brother," she whispered into his ear, giving it a lick.

She could feel his hot breath on her neck. It drove her crazy.

"And as much as I'd like to reward you for such an amazing achievement, we should really get going," she explained, pulling back to look at his blushing face. "It's almost time to report in."

A few more moments passed as Sasuke caught his breath, Itachi allowing him to come down from the high of ejaculation. Then, she reached down and pressed her lips into his, pushing her tongue into his mouth and taking her time to enjoy the taste of his saliva.

After feasting on her little brother's mouth for a few chaste minutes, she reluctantly pushed off and got to her feet. While she enjoyed this much more, they both had a duty to their village.

"Will…" Sasuke started, still panting slightly. She retrieved the slightly warm wash cloth they had prepared ahead of time from the nightstand, carefully washing his crotch. She didn't want him to be uncomfortable. "Will we continue after?" he asked shyly.

Itachi smiled, nodding, even as she diligently cleaned his cock and balls.

"Of course we will," she promised, finishing her cleanup. "And I'll do much more than just suck you off. So make sure you do your best." She punctuated her statement with a wink of her eye and a quick kiss to his now soft and clean penis.

As he pulled up his underwear and shorts, preparing for the day, he smiled, nodding his head vigorously. Sasuke was only fourteen, but he was still a man, still male. He still had the primal instinct that all men had, the desire to dominate, while also wanting to be pampered.

And Itachi swore to give her brother both those things.

"I'll become a strong shinobi, nee-chan," Sasuke promised, suddenly serious, dedication written all over his handsome face. "I'll be the strongest Uchiha ever. And I'll marry you no matter what and we'll rebuild the clan! I promise!"

He had sworn this same promise to her many times before, and Itachi wholeheartedly believed her Sasuke when he made her that promise. It was in his eyes. Lust and love in equal measure.

Love for her. For his own sister.

Itachi let the warm tidal wave wash over her. Her brother was her only weakness. It should have been something she hid, something she squashed as a kunoichi.

But she couldn't help it. She wanted to be defenseless with him. She wanted to be vulnerable with him. If he wanted to, even now, he could kill her if he wanted to. She wouldn't see it coming. With Sasuke, her guard was completely down.

And strangely, it was liberating.

His hand held her heart, her everything, and if he wanted to, he just needed to squeeze, and she'd be gone. But he never would. He would only hold it, and cherish it completely. It was the greatest feeling in the world.

"I'll hold you to that promise, little brother," she smirked at him hungrily, her Sharingan still activated. "You only belong to me."

The sight of her activated Sharingan and no doubt slightly scary smirk would have terrified any other man, but not her Sasuke. She could see it his eyes, now as crimson as hers, with three tomoe in each eye.

It turned this boy on.

I took this down to change the story a bit. Nothing changed in the actual chapter except the ages and what they were going to do after their fun time.

I love incest hentai (all hentai, really, but incest is a favorite of mine), and I love reading and writing fanfiction. So mixing the two was an obvious choice.

I'm unused to writing sex scenes, so this was kinda hard but still really fun. Please let me know what I can improve, and what you liked. Don't be shy to get graphic. I'm almost positive I'm more perverted than anyone on this site, so you won't gross me out.

I think I'll leave a hentai manga recommendation down here for you all. Give it a read!

Anemone by Sahara Wataru. (You can find it on n hentai dot net) (no spaces)