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The first night after she'd found her brother's porn, she'd ignored it. Pretended she hadn't seen it. Went to bed early and tried not to think about it.
But repressing it only meant that when she dreamt, all she saw were visions of herself, or rather, a better version of herself.
Her tits were exposed by a deep cleavage instead of being hidden away under her uniform, and Makoto couldn't not notice them anymore.
The same was true for her ass, just barely covered by a miniskirt, which did nothing to stop her brother from grabbing a handful of it, manhandling the whore his sister had become.
And that Komaru was a whore. She moaned as Makoto's grip tightened, and giggled vapidly when he talked to her, demanding she drop to her knees and use her plump dick-sucking lips for something useful.
And the moment her knees hit the floor, when that titanic cock flopped out of her brother's pants to instead use her face as its pillow-
Komaru woke up, her sheets ruined, and her fingers deep in her pussy.
That was how she woke up on the first day of the rest of her life.
Her routine wasn't too different from daily exercising, in Komaru's mind.
It even shared a lot of similarities with it.
The dryness of her throat as she panted, the way her thigh muscles twitched in exertion, the sweat that ran down her brow…
And all of it to become a better version of herself.
Of course, spending literal hours shlicking herself as she watched bimbo porn and mindlessly recited mantras was a lot more enjoyable than running around for no reason.
It also meant that Komaru wasn't able to make these kinds of connections.
No, her training was already bearing fruits, and what delicious fruits they were~
There was a sort of permanent pink filter that had begun to intrude on her every thought, coloring them all to a different extent. Some were so obscured as to have completely disappeared, while others were simply given a cute new coloration that helped keep Komaru motivated as she thought of Makoto's cock, how it would taste, and how well it would fill her cunny~
And whenever a thought that didn't relate to that began to form, it was almost immediately buried by the pink fog, leaving the bimbo-in-training simply staring into brain-melting pink whenever she went looking for them.
Whether that was homework, food, or her friends' name~
No, all that mattered were thoughts of sex, Makoto, and the wonderful phrases the videos she'd found taught her.
'Think Not, Suck Cock'
'Bouncy Bimbo Boobs'
'Sister Cumdump'
That one was always particularly effective. She sometimes found herself mouthing it soundlessly at school, at the dinner table, or even in her sleep!
Whenever she did, she couldn't help but hear Makoto's voice as he called her that.
Past Komaru might've known, intellectually at least, that those kinds of bimbo hypnosis videos didn't really work.
And in the beginning, they hadn't. The flashing lights hurt Komaru's eyes, and she only ended up with a somewhat satisfying orgasm, if that.
But Komaru had been determined to become the slut her brother deserved. And even though the videos were only supposed to be make-believe, if one spent more time cooking their brain in a marinade of femcum than they did sleep, well…
Komaru had well and truly managed to burn out her brain. And she couldn't be happier about it.
She sadly still had to go to school, but instead of paying attention in class or whatever, she instead listened to her mantras with her earbuds, drooling out her thoughts on her tits, and hid away in the bathroom at every opportunity to paw at her needy cunt.
Whenever her brother was home, she would follow him around and do her best to be of use to him, even as her brain melted down her thighs and she found herself struggling to follow even the simplest instructions.
Hopefully, Makoto would soon grow frustrated enough with her to begin using her like the slut she was meant to be~ Komaru was feeling quite confident that while she could barely manage to read instructions on the back of a packet of ramen, she could drop to her knees like the best of ‘em.
Whenever he was out, she masturbated. She ripped off her constraining clothes, snuck away to her brother's room, and fingered herself to exhaustion while she basked in his manly musk.
She could smell his tasty cum in the air and languished that she hadn't been there to taste it.
And that was what she was doing right now.
Completely nude, face down, ass up as she buried her fingers in her pussy and her nose in her brother's mattress, filling her brain with pleasurable sparks and her lungs with his musky scent.
Her hips twitched high in the sky as she pleasured herself, her tongue lolling out of her mouth and licking at Makoto's covers, dyeing her tastebuds in the taste of his sweat.
She didn't know how long it had been since she'd begun.
Masturbating and training both.
Whenever she tried to look back, the pink fog was waiting for her, swallowing her whole, and by the time she reemerged, she was much too busy fantasizing about Makoto's cock to even remember what she'd been thinking about.
Sometimes she wondered if someday she'd even remember that she hadn’t always been like this.
The thought always got her so aroused~ She had to drop everything and shlick away at her pussy, doing her best to erase the old Komaru forever~
Just like she was doing now.
Letting the pleasure completely overwhelm every last thought she might still have, just shlick, shlick, shlicking away whatever intelligence might still be hanging on.
That was probably why she missed Makoto's return once again.
As usual, when he entered his room to the sight of his sister frantically trying to cum her brains out, her fat ass high in the air and wiggling in mindless ecstasy, there was but one thing any warm-blooded male could do. He greeted Komaru with a harsh spank, his hand sinking slightly into the doughy cheek and sending its twin wobbling like jello.
Komaru squealed like a stuck pig when she felt her brother's touch and came like a fountain, her hips desperately humping the air in a grotesque display of animal pleasure, no doubt giving her brother an even better view as she shook her ass for all she was worth, earning herself another pair of spanks. Komaru’s moans only climbed higher and higher as she was rewarded for her showing until she could barely breathe around her cries of pleasure.
Makoto only smiled at the sight, before walking around the bed, and pulling on Komaru's hair, forcing her to look up at him.
Her face was distorted with pleasure, her lips pouting around her hanging tongue, which was still trying to lick the air, apparently not even noticing that she had been moved.
And her eyes-
More and more light left them by the day. For a solid minute, they seemed to stare straight through Makoto, unseeing, but eventually, they focused back on him.
Immediately, Komaru's panting increased in speed, and Makoto could almost see the hearts forming in her eye.
"Makoto~" The slut whimpered, her masturbation somehow growing even more frenetic.
"Hello, Komaru. How are you feeling today?"
"H-Horny. Want cock... Your cock~" His sister said, apparently not even willing to stop the flow of pleasure long enough to catch her breath and speak complete sentences.
Makoto could only smile at the sight. "Do you?" He lowered his sister's head, down to his crotch's level, making Komaru moan just at the sight of his hardness through his pants.
She began struggling in his grip, trying to lean forward, but Makoto's grip on her hair was iron, making her whimper in disappointment.
She looked up at her brother, pleadingly, making Makoto's smile widen. "What do you want, Komaru?" He asked.
"Cock! I want your cock! Please let me suck it! Please please pleaEEEEE!" Komaru's begging transitioned into a brainless squeal as Makoto let go of her, sending her face directly against his crotch.
Komaru moaned, her hips twitching as her brain seemed to completely turn off, simply resting her face against his manhood, sniffing at him like a bitch in heat.
She was making so much progress~
"Get a grip, bitch, and get my pants down."
"Y-Yes!" Komaru exclaimed, a manic glee in her eyes as her hands finally left her pussy, rapidly unbuckling his pants. She grabbed hold of his waistband, and lowered them all at once-
Leaving Makoto's hard cock to flop down on top of Komaru's face.
For a moment, Komaru simply stared at it, her eyes crossing.
Then, the smell hit her. It was like a cloud of pure sex had suddenly invaded her mind, easily overpowering her dumb bimbo brain, and completely shutting down whatever hint of awareness had desperately been trying to keep the slut functioning.
And as those final few remnants of humanity were smothered beneath her brother’s manly musk, all the sow could feel was pleasure.
She moaned, her eyes rolling up in her skull as she came thunderously, her whole body spasming.
Then, she fell forward, slumping against Makoto's dick and balls.
He sighed, but still held a small smile. "That's as far as she goes, I guess." But she really was making such good progress. The last time they'd done this, she hadn't even managed to get his pants down before cumming her brains out.
"Good job, Komaru." He said to his brain-dead sister, her tongue still lolling out and unconsciously licking at his balls.
Makoto couldn't stop a small sigh of pleasure at his sister's actions. Well, Komaru probably deserved a reward for such hard work, didn't she?
He pulled her face back once more and lined up his cock with her mouth.
"Open up, slut." He demanded, and, no doubt recognizing the voice of her owner even unconscious, Komaru's mouth fell open, her tongue hanging out of it like a red carpet.
Without even sparing a thought for his unconscious sister’s well-being, Makoto violently hilted himself as deep as he could reach, before pulling back out in one go. He barely gave Komaru’s tongue a moment to mindlessly lap at his gland, before thrusting back in, and then back out again, over and over.
Her lips instinctually created a tight seal for him to fuck, and he didn't hesitate to do just that, holding onto his sister's face as he used her to empty his balls.
By the time Makoto was ready to blow, Komaru had covered her front with drool, and there was no mistaking the happiness in her unseeing eyes as she was fed her favorite treat, no doubt craving her brother’s musky cum like a junky her next hit.
Makoto forcefully pressed Komaru’s face against his groin, feeling his balls twitching against her chin as he unloaded a day’s worth of cum he’d been accumulating just for her, and even unconscious, Komaru’s well-trained body recognized her master’s cum’s taste, and began cumming herself, further ruining Makoto’s sheets, though they had already been beyond saving by this point.
But, well, there were worse ways to dirty his bed, Makoto thought. He pulled himself out of his sister’s mouth, though not completely, letting the slut suckle at his tip with a dumb expression of pleasure on her face. He would have to throw her back in her own bed sooner rather than later, but that was a low price to pay in exchange for a live-in slut who was desperate to pleasure him.
And Komaru would no doubt appreciate waking up to a stomach full of his seed and work even harder in the future to make sure she'd remember it happening next time.
She sure was lucky to have such a supportive brother~