Chapter 381 (Se-young)
Translator: RaidenTL
Chapter 381 (Se-young)

(Se-young in the near future)
Before checking the text from Aunt Seon-ju, Si-woo had intended to ask Se-young about Teacher Yoo Ye-na.
For some reason, Se-young was acting as if the conversation they’d just had—a chat disguised as mundane daily life—and the explicit nude photos she’d received from the mother and daughter meant nothing at all.
It was a contradictory and deceptive attitude. Even as she indulged Si-woo’s lewd and sadistic whims, she strictly maintained the facade of a brother-sister relationship whenever there was a risk of outside eyes or the leak of a secret.
It was as if she were personally teaching Si-woo the rules and the way to live by compartmentalizing the ordinary from the extraordinary.
Perhaps Se-young had begun this act the moment they stepped out of Aunt Seon-ju’s front door, without anyone noticing.
Faced with Se-young’s incongruous expression and attitude, Si-woo felt his thoughts grow hazy, as if he were falling under a hypnotic spell.
Looking at Se-young’s innocent face, Si-woo instinctively realized that no matter what he asked now, he wouldn't get the answer he wanted.
In fact, he wasn't even sure what kind of answer he had been looking for in the first place.
The pasts and secrets of the family... the mothers' Slave Contracts... Teacher Yoo Ye-na’s true identity and goals... Se-jin Noona’s pregnancy...
The rising questions and suspicions scattered like bubbles. All that remained within Si-woo was a sadistic impulse and a desire to twist that innocent face of Se-young’s into a grimace.
Si-woo pulled up the vibrator app on his screen again and touched the buttons to manipulate the vibration.
He selected a mode programmed to change intensity, strength, and rhythm dramatically, then locked the settings.
He had no intention of releasing the lock until they reached the park.
Bzzzzzzzt! Bzzzzzt! Bzzzt! Bzzzt! Bzzzzzzzzzt!
The vibrator pulsed in a bizarre rhythm, echoing the vibrations of his smartphone.
"Hnghh... Ha-ah... Ahh... Ha... Haaah..."
Se-young’s expression contorted and moans escaped her lips in sync with the vibrations.
As she hunched her body over again, the composure she had shown just moments ago was nowhere to be found.
"Hurry up! How long are you going to keep dawdling?"
Si-woo spoke sharply, as if prodding her, before shoving the smartphone into his pants pocket and walking ahead.
Every time the vibration lengthened, Se-young would freeze, her body tensing up. When it loosened slightly, she would walk briskly to catch up with him.
Before long, beads of sweat were forming on Se-young’s forehead.
Si-woo’s smartphone was synchronized with the vibrator’s pulses.
Tucked deep inside his pocket, the phone pressed against his cock shaft, vibrating in unison with the device inside her.
The pleasure vibrating through the shaft spread through his entire body like a shiver.
* * *
Every time the vibration of the smartphone in his pocket intensified, the distance between him and Se-young, who was following behind, grew.
Whenever Se-young’s moans leaked out from a distance, Si-woo’s shaft trembled as if resonating with the sound.
Then, when the vibration weakened, Se-young would rush toward him.
Si-woo headed toward the park, repeatedly widening and narrowing the gap between them as if playing a game of tag.
Soon, they reached the entrance of the park.
It was the park right in front of their house, the one Se-hee Noona passed through every morning while jogging.
Si-woo glanced back to check on Se-young following him, then stepped inside the park entrance.
Recalling memories of that time, Si-woo slowly scanned the area.
His eyes landed on the park restroom.
The very restroom where Se-hee Noona, Shin-bi Noona, and their friends used to gather to smoke.
The place where he had first witnessed the delinquent side of his sister and her friends.
It was also the place where Si-woo’s masturbation with Se-hee Noona’s panties had been officially recognized.
Se-young, who had been trailing behind, seemed to spot the restroom just as the vibrator’s intensity weakened enough for her to catch up.
"Oppa... the bathroom... I... I need to go, quickly..."
Se-young spoke cautiously, her voice laced with a sense of relief as if she had finally found a lifeline.
She had been barely holding back the urine that felt like it was about to burst out of her.
An involuntary look of relief crossed her face, and her psychological tension seemed to ease slightly.
Reading that relief instantly, Si-woo flashed a dominant smile.
"Where do you think you're going? Who said you could use the bathroom?"
Si-woo scolded her in a firm tone.
Startled by his stern voice, Se-young’s expression went blank for a moment.
That blank look soon contorted into a pale, ghastly mask of despair.
From the finality in Si-woo’s voice and expression, Se-young already knew he had no intention of letting her use the restroom.
"But Oppa... earlier... you said... if we got to the park... you'd let me let it out..."
Still, Se-young tried to persuade him, reminding him of his words like a drowning person clutching at a straw.
"I said I'd let you let it out. I never said I'd let you use a bathroom!"
Si-woo continued to speak in a threatening tone and manner.
"O-Oppa... please... please... can't I just go now...? I really feel like I'm going to pee... Hngh!"
Twisting her body in agony, Se-young pleaded desperately, her face looking as though she were about to burst into tears along with her bladder.
"You feel like you're going to pee? Then you should pee if you have to, right?"
Si-woo, who had been watching her with a stern face, suddenly asked in a gentle, almost concerned voice.
"Yeah... Oppa... I really can't hold it anymore...! It's an emergency!"
Sensing a glimmer of hope in Si-woo’s softened voice, Se-young looked at him piteously once more, desperately appealing to her dire state.
"Right~ if it's an emergency, it can't be helped... I'll let you do it! Come here, Se-young!"
Si-woo called her over with a gentle smile and a mocking tone.
Se-young, who lacked the mental capacity or energy to distinguish the awkwardness or dissonance in his voice, forced a distorted smile of joy at the thought that her brother was giving her permission.
Moving her legs, which she had been squeezing together, she hurried toward him.
However, her expression quickly froze.
She realized that Si-woo wasn't heading toward the restroom entrance, but toward the path leading behind the building.
Even so, she had no choice but to follow him if she wanted to relieve herself.
Accepting her plight, Se-young followed Si-woo on trembling legs.
Si-woo rounded the side of the restroom building and only stopped once they reached the rear passage.
The back of the restroom, paved with stone, was thick with trees and bushes, providing a fair amount of cover from outside eyes.
From behind the building, Si-woo peeked his head out slightly to make sure no one was approaching.
Fortunately, at this hour, it seemed no one else had business in this secluded corner.
Se-young, who had followed him all the way here, looked up at Si-woo with eyes full of anxiety.
Though she likely anticipated what was about to happen, she stared into space with a troubled expression, as if trying to ignore the reality of it.
Si-woo pulled the smartphone, which had been vibrating against his shaft, out of his pocket.
He then opened the camera app and thrust the lens toward Se-young.
Ding!
Si-woo began recording her.
* * *
Keeping the camera lens fixed on Se-young, Si-woo reached out toward her shoulder.
Se-young flinched and hunched her shoulders at his touch.
Si-woo grabbed the right strap of the denim dress she was wearing and slid it down her arm.
Though startled by his movements as he began to undress her, Se-young seemed to have lost the ability to think and accepted his touch without resistance.
Knowing she had to obey him to relieve herself, she stood there sweating and flustered, letting him have his way.
Next, Si-woo’s hand moved toward her left shoulder.
Se-young squeezed her eyes shut and waited for him to strip her.
His hand brushed softly against her shoulder as he slid the left strap of the denim dress down her arm as well.
The blue denim dress lost its support and slid down, pooling powerlessly on the ground.
Se-young’s naked body was revealed before Si-woo’s eyes, radiating a potent sensuality and showcasing every feminine curve.
And it was all captured on the smartphone screen in Si-woo’s hand...
Her beautifully developing breasts, her slender waist, and her thickening thighs were all exposed without restraint.
Se-young trembled violently at the unfamiliar sensation of the cool, outdoor air touching her bare skin.