Claire could not move! The athletic, well-endowed high school girl had been lazing around on the sofa, texting with her friends when her older brother, Anon, suddenly barged into their living room. The obese man stood in front of her for a while, wheezing, catching his breath while Claire did her utmost to pay as little attention to him as possible. Despite her best efforts, she could not help but register that her overweight and unemployed NEET loser of a brother seemed to be very excited about something. She did not care in the slightest, though. Their interests were much too different for anything Anon found interesting to be appealing to her. The two of them were so unalike that she sometimes wondered if they were even really siblings.
“Hey, Claire! Look!” Anon passionately exclaimed while his double chins slammed against each other. Her older brother tried his hardest to make her look up at him, but Claire kept her attention laser focused on her phone. If Claire was completely honest with herself, Anon was such a nuisance that she would be better off if he just dropped dead! She really had no idea why their mom had not yet thrown that overgrown manchild out of the house, he was the type of man that ought to be forced to fend for himself. Perhaps then he would grow up and stop wasting all of his money on dumb anime figurines or whatever else that loser enjoyed so much.
"No fair, Claire! C'mon, check this cool thing out!" Her brother's begging for her attention was just pitiful. Claire sighed audibly, and finally looked up from her phone. Anon's fat face was red and his breathing was hard and fast. He was indeed extremely animated about something.
Nestled snugly in the hamlike appendages that were Anon's hands was some kind of pink crystal or gemstone. Claire's gaze immediately locked on it! It was impossible for her to not admire the truly beautiful, sparkling object caressed by her brother's porcine fingers. She lost herself in the swirling colors of the gemstone for a few moments. For once, it was an amazing thing that Anon had wanted to show her, so unalike most things from his life that her brother wished to share. Claire still shuddered sometimes when remembering that time when Anon had tried to explain to her what "moe" meant in the context of Japanese anime culture.
Well, no matter how pretty the bauble was, a cursory glance was enough. Claire was in the middle of a discussion of weekend plans with her friends, after all. She therefore turned her attention away from the stone and back to her phone, and paid little more heed to this overly exhilarated boar in man shape. Well, she tried to look back at her phone that was. She could not. She was absolutely immobilized! Her eyes still fixated on the glittering gemstone held by Anon.
"It's called an imouto stone, Claire!" Her brother's voice was nasal and shrill. “I ordered it online and it totally works! People on 4chan, you know, the cool and based version of Reddit, are going crazy over it! Well, at least the people lucky enough to have a little sister."
Based on what? Claire began to think, but the looming feeling of dread inside of her made her swiftly abandon any attempts to decipher her brother's strange ramblings. She made another attempt to move, to stand up from the sofa, but she just couldn't! She remained on the sofa, paralyzed. The tightly fitting tank top she wore clung to her ample breasts, as her chest heaved up and down calmly. She became acutely aware of how her hotpants barely covered her toned, tanned legs. She felt so naked and exposed laying there, immobile and helpless, in front of her freak of an older brother.
"You... what is this?" Claire managed to get out through gritted teeth. Even though her body could not move, she could still speak it seemed.
"It's so cool, Claire!" Anon's beady little eyes shone as he talked. "This stone will finally let me transform you into my new, ideal little sister, my dream imouto! Oh, and don't worry, sis! After the process is done, you'll be able to move again. I think..."
Claire concluded that there was only one answer to what was going on. Her brother had lost it completely! He had watched too much anime, or played too many video games, and his mind had finally rotted away. Claire understood that the word “imouto” that Anon had used meant little sister in Japanese. But what the hell had he done to her? Did he drug her or something?!
Suddenly, interrupting any chance for further contemplation, Claire felt as though a hot metal blade had been driven into her head, straight to her skull. The pain quickly subsided as new thoughts and emotions flooded her. "Anon is a wonderful older brother! Claire loves her older brother more than anything! Claire must please Anon. Claire must willingly serve her wonderful older brother's every need! Claire is a loving imouto!" A booming voice in her head rang out.
While the voice kept repeating like a mantra in her head, she could not stop herself from imagining and remembering all kinds of scenes and moments spent together with her brother. She cooked for Anon. Cleaned Anon's room. Washed Anon's back. Acted like an innocent but lewd little slut for Anon. Sucked Anon's dick. Let Anon use her banging, tanned, little sister body for his pleasure and every sexual need!
Through all of the fantasies she was forced to imagine herself in, she herself was wearing a tiny, undersized Japanese schoolgirl uniform. The sheer fabric of the blue hemmed sailor skirt barely covered her round ass while the silky shirt of the uniform hugged her big breasts tightly. She pictured Anon's gaze on her when she was dolled up in sexy cosplay for him, exposing her tanned skin with tan lines from all those hours spent swimming, and felt a genuine rush of joy. She so much wanted to, no needed to, be a pleasing little sister - a pleasing little imouto - for her older brother!
"NO!" Claire grunted while remaining immobile on the sofa. She shook her head as much as she could and dispelled all of the new emotions and desires that had tried to to take her over. They were not real! She was forced to feel that way because of her disgusting brother's dumb "imouto stone"! But as she thought of her brother now she... could not help but feel a need to treat him nicer than before. Why? Why were her feelings for Anon gradually changing? It was so hard to fight...
Anon literally squealed with joy as he looked at his curvy little sister laying prone atop the sofa before him. He let his gaze wander over her beautiful, tanned body with a hint of tan lines visible under her hiked up clothes, and licked his chapped lips hungrily. He knew it would only be a matter of time until Claire would be a completely altered high school girl. She would change into his ideal sister and an eager sleeve for his cock. Finally, Claire would behave like how a little sister should! Anon once again could not help but notice the alluring hint of tan lines under her tank top. Would she perhaps begin to refer to him as "Onii-chan" in a cute and funny tone when all of this was over? A tanned, athletic, imouto with visible tan lines that would use Japanese honorifics when adoring him? Just the thrill of imagining that made pearls of sweat form on Anon's bulging forehead.