Chapter 390 (Se-hee, Shin-bi)
Translator: RaidenTL
Chapter 390 (Se-hee, Shin-bi)

(Shin-bi Noona)
Si-woo stepped out of the room, his pants still pulled up haphazardly around his waist.
The waistband of his trousers caught on the lower middle section of his rock-hard cock shaft.
The upper part of the shaft, hooked over the waistband, jutted upward as if it were trying to burst through his clothes.
Si-woo’s red shaft of flesh glistened, coated in So-ra Noona’s pussy fluid.
The heat and moans generated by their clashing flesh, the profanities mixed into their conversation, and the sounds of spanking had been echoing from the master bedroom until just moments ago.
The two sisters in the living room must have been acutely aware of everything Si-woo was doing after he dragged So-ra Noona into that room.
Sitting on the living room sofa, Shin-bi Noona and Se-hee Noona were both flushing red as they stared at Si-woo’s penis bulging through his clothes.
Seeing his penis stretching almost up to his navel without any attempt to hide it, the two women sat there with dazed, flushed faces, their breath hitched—whether out of fear or arousal was unclear.
* * *
From the first-floor shower room, the sound of Se-young washing herself could still be heard.
Perhaps because he had just finished thoroughly ravaging So-ra Noona in the master bedroom, Si-woo felt quite calm.
"Is Se-young still not done showering?"
Si-woo spoke in his usual tone, the same way he always addressed Shin-bi Noona and Se-hee Noona.
"Oh... yeah... she usually... takes a long time when she’s in there alone with no one waiting... sometimes it takes forty or fifty minutes, or even longer..."
Se-hee Noona answered awkwardly, her words rambling as she avoided his gaze.
"Is that so?"
Si-woo brushed off her answer and glanced at the clock hanging on the living room wall.
Since he had entered the master bedroom with So-ra Noona to have sex, about twenty minutes had passed.
There was likely still plenty of time before Se-young finished her shower.
Si-woo shifted his gaze back to Shin-bi Noona and Se-hee Noona, scanning their condition.
The two of them sat tensely, legs pressed together and backs straight, as if they were being punished.
Si-woo thrust his pelvis forward ostentatiously, making the penis erected beneath his clothes bulge even more prominently.
"Se-hee Noona, aren't you a bit hot right now?"
Si-woo struck up a conversation with her for no particular reason.
"Huh?... Yeah... a... a little..."
Se-hee Noona replied, her breath coming in shallow pants.
"Then... I think it would be fine if you took your clothes off, like before."
Si-woo suggested it casually, as if it were a passing thought.
"Mom’s out grocery shopping, so she’s not home anyway..."
He added the remark sarcastically, as if mocking the fact that it no longer mattered whether their mother was home or not.
Even with Shin-bi Noona watching right beside them, Si-woo told Se-hee Noona to strip as if it were the most natural thing in the world.
"Okay... I’ll... I’ll stay undressed while... while Mom is out... like before."
As if understanding that his words weren't a mere suggestion, Se-hee Noona replied in a submissive tone.
Si-woo approached her, thrusting the penis that bulged over his waistband toward her.
His massive penis, hidden only by the fabric of his clothes, was now right in front of Se-hee Noona’s face.
Startled, she instinctively leaned back.
Si-woo looked down at her silently, his penis still thrust forward.
Flustered, Se-hee Noona glanced at Shin-bi Noona next to her, but soon straightened her back and returned to her original posture, bringing her face close to where Si-woo’s penis was.
Si-woo’s penis throbbed just inches from her face, so close they were almost touching.
He pushed his pelvis forward a bit more, pressing his penis against her face.
As if she knew exactly what he wanted, Se-hee Noona did not pull away.
Si-woo wiped the pussy fluid and mess from So-ra Noona that coated his cock onto Se-hee Noona’s face.
It was a display of dominance, as if he were flaunting his master-slave relationship with Se-hee to Shin-bi Noona.
Si-woo smiled with satisfaction at Se-hee Noona’s obedient attitude and tone in front of Shin-bi.
He pulled his penis away and placed his hand on top of Se-hee Noona’s head.
Then, he stroked her hair as if praising a good girl.
Si-woo stole a glance at Shin-bi Noona, who was watching from the side.
Shin-bi Noona was watching the siblings' antics with dazed, unfocused eyes.
When her eyes met Si-woo’s, it was like a spark flying from a short circuit.
It seemed it was now Shin-bi Noona’s turn for sex.
So-ra Noona was still lying unconscious on the bed in the master bedroom.
If he went into Se-young’s room to have sex with Shin-bi Noona, he’d be worried about Se-young coming out at any moment.
Si-woo turned his attention to a room on the first floor that had been vacant for a long time.
"I’m going to go talk to Shin-bi in Se-jin’s room for a bit! Wait here. That’s okay, right?"
Si-woo spoke as if asking for Se-hee Noona’s permission, though he was really announcing his intention to have sex with Shin-bi Noona in Se-jin Noona’s room.
Upon hearing this, Se-hee Noona glanced at Shin-bi Noona’s expression and then lowered her head deeply.
"O... okay..."
She gave a short reply in a shy voice, her face blushing.
To Si-woo’s declaration, which was no different from saying he was going to violate Shin-bi Noona, Se-hee Noona gave a bashful affirmation.
"I'll be back."
As soon as he received Se-hee Noona’s pseudo-permission, Si-woo reached out to Shin-bi Noona sitting next to her.
Shin-bi Noona had been sitting beside Se-hee, her face flushed as she tried to control her ragged breathing.
She carefully placed her hand on Si-woo’s outstretched palm.
Si-woo gripped her hand and pulled her toward him.
Shin-bi Noona yielded to his strength, entrusting her body to him.
With that, Si-woo led Shin-bi Noona toward Se-jin Noona’s room.
* * *
Se-jin Noona’s room was dim, the curtains drawn.
It was a room that had been neglected for a long time, with almost no one entering except when their mother cleaned.
Just as he had done in the master bedroom with So-ra Noona, Si-woo entered the room, leaving the door slightly ajar.
In the darkness, outlines were faintly traced by the light leaking through the gap in the door.
The neatly organized desk, the wardrobe, the bed, and the bedding gradually became familiar to his eyes.
Si-woo’s eyes instinctively drifted toward the drawer of Se-jin Noona’s desk.
The place where the Slave Ledger and photos he had found the previous night were kept.
The evidence that everyone who participated in the blind date was connected to his mother’s and family’s past or secrets.
Si-woo had brought Shin-bi Noona into this secret place where those powerful and direct pieces of evidence were stored.
Holding Shin-bi Noona’s hand, Si-woo slowly approached the bed.
Shin-bi Noona stood facing Si-woo in front of the bed.
In the dimness of Se-jin Noona’s room, her facial expression was hard to see.
However, Si-woo could tell she was nervous by the irregular rise and fall of her silhouette and the warmth of her breath.
Si-woo boldly began to strip in front of the woman facing him.
He took off his oversized navy checkered shirt and white T-shirt, then shed his elastic pants and underwear all at once.
In an instant, Si-woo stood completely naked before Shin-bi Noona.
His rock-hard penis throbbed in her direction.
Si-woo imagined that his penis, like Shin-bi Noona’s shoulders heaving with ragged breaths, must appear as a faint silhouette to her in the darkness.
* * *
"Shin-bi, you strip too!"
Si-woo commanded her in a firm, low voice.
Shin-bi Noona’s body trembled as if reacting to his voice.
After a moment’s hesitation, she began to take off her clothes according to his command.
Her top and skirt fell to the floor in an instant.
Si-woo reached out and gently felt her body.
His palm touched her soft shoulders.
As his hand swept down toward the bra covering her breasts, Shin-bi Noona’s body flinched and shuddered.
Si-woo pushed her bra upward, exposing the voluminous breasts contained within.
Shin-bi Noona’s elastic breasts bounced out like pudding and swayed.
Si-woo firmly squeezed one of her swaying breasts with one hand.
The firm flesh of her breast was crushed within his grip.
"Haa...!"
A pained moan escaped Shin-bi Noona’s lips.
Si-woo reached down with his other hand and firmly gripped the flesh of her buttocks.
"Haa... ah... hngh...!"
Shin-bi Noona let out a groan, her muscles tensing.
"That day... did you get home okay?"
Si-woo asked while kneading her breasts and buttocks with his palms.
—He spoke in a casual tone, as if asking about her day, a stark contrast to the situation unfolding between them.