Second floor, in the bedroom.
Yuzuru gently placed Ai on the specially made bed, large enough to accommodate five adults. The brown-haired loli immediately curled up like a frightened kitten, her hands protecting her chest.
She was a little flustered.
How did I suddenly become a guinea pig?
She's always the one using others as guinea pigs; now it's her turn to be the guinea pig.
Seeing this, Akemi smiled gently, walked slowly to the bedside, gently pressed her sister's shoulders, leaned down and whispered in her ear, "Ai, don't be nervous. We're just testing the effect for Master Yuzuru. Your older sister needs to be tested too..."
Ai: "......"
"It's even scarier because my older sister is around!"
The little girl wailed inwardly.
She knows her older sister too well.
On the surface, she appears gentle and dignified, as if she were the most gentle and elegant woman in the world. But in reality, she is completely obedient to Yu Sheng Nan and will agree to any embarrassing request he makes without hesitation.
The proud little girl glared at her older sister with shame and indignation, but froze when she saw Akemi's equally flushed cheeks.
The usually dignified and elegant older sister's eyelashes trembled slightly, and a faint pink tinge appeared on her fair neck, clearly indicating that she was not as calm as she appeared.
"I...I can record the experimental data for you..."
Ai Haibara makes a final attempt to fight back.
As an outstanding scientist, she was all too aware of the various possibilities that "increased flexibility" meant in intimate relationships; the mere thought of those images was enough to make her blush.
Yuzuru chuckled softly, his slender fingers gently lifting her chin: "Miss Scientist, isn't it true that only by personally participating in experiments can we obtain the most accurate data?"
His thumb lightly brushed against Ai's chin, causing the girl to catch her breath.
It took a long time before the Miyano sisters finally sat down side by side on the edge of the bed.
Akemi had regained her usual gentleness and composure, but the blush on her cheeks betrayed her mood; while Ai had her head down, her short brown hair falling down, covering most of her face, but the tips of her ears peeking out from between her hair were so red they were almost bleeding.
"Then, let's begin the test." Yuzuru Nan had a faint smile on his lips as his gaze shifted between the two sisters.
The maid nodded gently, raised her arm, bent it backward, and easily touched her back with her fingertips. The movement was elegant and smooth, as if there was no obstruction in her body.
"It seems to be working really well," Yu Shengnan exclaimed, gently supporting her waist and guiding her to lean back even deeper.
Mingmei obediently cooperated with his movements. Her waist was as supple as a willow branch in spring, almost bending into a perfect arch. Her body seemed boneless, light and flexible, and her legs easily spread 180 degrees.
The little maid's breathing quickened slightly, her eyelashes trembled, but she still maintained a gentle smile.
"Young Master Yuzuru... is this alright?"
She asked softly, her voice tinged with shyness.
“Perfectly.” Yuzuru chuckled, steadying her waist with one hand while the other slid slowly down her outstretched arm, feeling the delicate touch of her skin. “Can we continue?”
Akemi nodded gently, and under Yuzuru's guidance, she bent her waist even further back, her long hair cascading down like a waterfall, almost touching the ground, and the rise and fall of her chest became more pronounced with each deep breath.
"My sister spoils him too much!"
The haughty little girl blushed as she watched, turning her face away but unable to resist stealing glances.
Akemi chuckled softly, and with Hanyu Nan's help, slowly straightened up. Then she reached out her hand to her sister: "Ai, it's your turn."
"etc!"
Ai took a step back warily. "What are you going to do?"
“Of course, we need to test the effects comprehensively.” Yuzuru smiled innocently. “As meticulous scientists, we need to collect data under various positions, right?”
"I don't want to be your guinea pig!"
Ai, like a cat with its fur standing on end, suddenly shrank back.
However, with a slight twist of her wrist, Akemi cleverly hooked her sister's wrist at an angle. With the added benefit of her flexibility, her movements were incredibly agile, and she easily pulled Ai over.
“Ai,” Akemi said gently but firmly, “as scientists, we should set an example.”
"Sister, you've clearly been corrupted by him!" Ai looked at Akemi with despair, her eyes flashing with the same light as Hanyu Nan's.
Yu Sheng Nan caught the arrogant loli with one hand supporting her slender back and gently lifting one of her legs with the other.
Before Ai could even protest, she was guided to assume a standard split pose.
"Let go of me..." Her voice trembled.
Thanks to the flexibility effect, Ai's legs seemed to have endless flexibility, allowing them to rotate in an almost exaggerated manner.
With a little effort, Yuzuru separated her legs into an exaggerated split, then folded them forward until her toes easily touched his shoulders. The posture was both beautiful and extremely shameful.
"Hmm..."
The little girl bit her lip, glaring at Yuzuru with embarrassment and anger, but she was powerless to resist.
Her legs were easily spread to their limit by Yuzuru Nan, her slender waist was so soft that it seemed boneless, and her whole body was like a fully drawn bow, presenting an ultimate and alluring posture.
"Sure enough, the flexibility has improved a lot."
Yuzuru whispered, his fingers slowly sliding down her leg, feeling the temperature of her skin and her slight trembling.
Akemi watched tenderly from the side, then leaned closer and hugged Ai from behind, gently stroking her sister's waist with both hands: "Ai, relax..."
Ai was sandwiched between the two men, and this extremely intimate and embarrassing scene made her, who was already easily embarrassed, so shy that she could hardly speak.
Because of her increased flexibility, her body could easily assume various difficult poses, and Yuzuru clearly had no intention of letting this opportunity slip by.
"Next, let's test the flexibility of your body." He grinned mischievously, gently pinching Ai's chin with his fingers, the pressure just right—not enough to hurt her, yet not enough to make her break free, forcing her to tilt her head back.
Ai was forced to look him in the eye, her icy blue eyes glistening with tears, a mixture of embarrassment and a barely perceptible hint of anticipation.
Yuzuru Nan slowly lowered his head and kissed her lips.
At the same time, Akemi gently combed her sister's hair with her fingers, then leaned down and placed a soft kiss on the side of Yuzuru's neck.
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