So Big and So White…
The quiet of the night was broken only by the soft scratching sound of pencil against paper.
"Ruru-nee, the key to this function problem is actually right here…"
Under the bright desk lamp, Kūjō Ryō patiently explained the math problem to his cousin, Yoshino Ruru, who sat at his left side, only a few centimeters away.
The girl gave a soft "Mm," dragging out the ending slightly, sounding distracted.
Then that warm presence edged closer. A gentle breath brushed against Ryō's ear, ticklish and faintly sweet. The soft fragrance of body wash and shampoo slipped into his nose, making his breathing unconsciously heavier.
He took a slow breath and continued calmly, "If we let f(x) equal zero…"As he spoke, his pace gradually slowed.
Yoshino Ruru's left hand rested casually at the edge of the workbook, only half an inch away from Ryō's palm pressed flat against the page to steady it. Every time he began explaining, those slender, pale fingers would brush him lightly, pretending to be accidental. A fleeting touch, then retreat, only to return again.
The feather-light sensation made it hard to focus.
"I still don't get it," she murmured softly, shifting closer without a trace. This time, her body was almost pressed against Ryō's left arm.
Through the thin fabric of her sleepwear, he could clearly feel her warmth and softness, like leaning against a piece of warm jade. It was far too comfortable.
Focus. One last problem.
Ryō clenched his teeth and forced himself to concentrate. "Alright, I'll explain it more carefully."
Ruru seemed completely unaware of his internal struggle. Her face drew closer, warm breaths trailing along his ear and neck, carrying that sweet, gentle scent that left nowhere to escape.
"Start from the beginning," she said softly, her voice brushing his heart like a feather. "Your cousin didn't quite understand the earlier part either."
Ryō's breathing stalled.
Crack.
The pencil snapped in his fingers.
A crooked line marred the paper, ruining half a carefully written formula. Ruru let out a small "Ah," her tone innocent with a hint of surprise.
"It broke. You should erase it," she reminded him quietly, her warm breath brushing his ear again.
Ryō reached for his pencil case with his left hand. Empty.
He scanned the desk. Nothing. He lifted the workbook. Still nothing. The small white eraser seemed to have vanished into thin air.
"Can't find it? Maybe you missed a spot?" Ruru asked, her voice carrying a trace of innocent confusion.
"I'll check the floor," Ryō said, turning his head and searching around his feet. Still nothing.
Then the girl beside him moved.
She straightened slightly and tugged down gently at the soft hem of her sleepwear, as if absentmindedly adjusting it.
That simple motion revealed a dazzling expanse of pale skin. The fabric shifted, forming a dangerously inviting curve.
Ryō's gaze was pulled as if by an invisible thread.
There, nestled in a place impossible to ignore, sat the square white eraser.
So big. So white.
"Looks like it fell here," Ruru said, blinking.
Ryō swallowed and forced his eyes away. "Ruru-nee… if you do this, I won't be able to teach."
Instead of pulling back, she leaned in slightly, making the eraser and that overwhelming view even clearer in his line of sight.
"If you don't take it out, how can you keep explaining?"
Ryō's throat bobbed. A restless heat stirred low in his abdomen.
She really was getting bolder.
But he had to endure it.
As a reborn man, Kūjō Ryō had far greater ambitions. In a world bound by monogamy, he intended to walk a different path.
He would remain single. He would deepen his bonds with every beautiful girl. He would make them unable to leave him.
"What's wrong? Did you get distracted?" Ruru smiled warmly. "You can even… take it directly."
Seeing him hesitate, she lifted her chest slightly, the motion subtle but overwhelming.
Ryō felt himself reaching his limit. A voice inside him roared, urging him to give in.
He took a deep breath, suppressing the rising heat, and carefully reached out with his left hand.
Using his thumb and forefinger, he gently retrieved the eraser from its dangerous hiding place.
The movement alone sent another silent wave through the air.
His fingers inevitably brushed against warm, soft skin. The sensation threatened to pull him under entirely.
He quickly steadied himself, dragged his gaze back to the workbook, straightened his posture, and said firmly, "Ruru-nee, don't tease me. This is the last problem. After this, we rest."
"Okay. I won't disturb you," she said immediately, withdrawing with a composed expression and focusing on the page.
Ryō glanced down cautiously. Seeing that the delicate hand resting on his knee stayed still, he finally let out a quiet sigh of relief.
He resumed explaining. "The idea is basically like this. Ruru-nee, try solving it yourself."
"If I get it right, you have to give me a reward," she said confidently, gripping the pencil and writing out the solution step by step.
Ryō watched silently.
Her hands were beautiful. Slender, graceful. Her handwriting was neat and elegant, and the solution process flawless.
Five minutes later, she finished writing. Under her expectant gaze, Ryō nodded.
"All correct."
Ruru threw her hands up happily. "Yes!"
Then she looked at him with bright eyes. "You promised. The reward."
She closed her eyes, tilted her head slightly upward, and waited.
Ryō's heart raced as he looked at her delicate face and soft, pink lips.
He leaned forward and gently pressed a light kiss to her smooth forehead, pulling back immediately.
"Alright. Go back to your room and rest, Ruru-nee."
She didn't get up.
Instead, she leaned closer, almost pressing against him.
Her soft hand traced slow circles over his chest. "You worked so hard teaching me. It's only fair I reward you too."
Her hand slid lower.
Ryō's body stiffened.
"…"