"S-Sis...?!"
"Nijika?!"
They stared at each other, minds reeling.
Why is my sister here?!
This is supposed to be where I meet with Seiji... for our arrangement!
Could it be...
The same absurd thought surfaced in both their minds. Their expressions shifted dramatically.
Ding!
The elevator doors slid shut.
The sisters stood in silence, the atmosphere rigid and suffocating.
Neither spoke until they reached the top floor.
Seika lowered her head and stepped out first, pressing the doorbell.
Nijika followed behind, her expression complicated.
"Ah, you're here."
Seiji opened the door, acting as if he didn't notice the strange tension between them.
He smiled and invited them inside, casually pouring a drink and handing it to Seika, whose face had gone pale.
"Welcome, both of you. I called you here today to discuss a new 'business arrangement.'"
He placed a document on the table.
It was the Shimokitazawa Rock Alliance proposal his assistant had mentioned.
"This is a new project my company has developed—a 'Shimokitazawa Rock Alliance' initiative. Simply put, we plan to unite all the live houses in Shimokitazawa, with STARRY at the center, to host a major New Generation Rock Festival next summer."
"Kessoku Band will be the headlining act."
"This is your best opportunity to go from 'underground' to the 'mainstream' spotlight."
The sisters instinctively glanced at the document.
But their minds were incapable of processing anything about "careers" or "dreams" right now.
After a single glance, they looked away—and stared hard at each other instead.
Silence hung heavy in the air.
On the couch, Utaha and Eriri watched the show unfold with amused smiles, saying nothing.
Finally, Seika spoke, her voice trembling.
She glared furiously at Seiji.
"Seiji Fujiwara!" she shouted, her voice laced with anger and unease. "What do you mean by calling Nijika here?! What does this have to do with her?!"
Nijika's voice was complicated as well. "Seiji... why is my sister here?"
By now, they both understood the situation.
They just weren't ready to face it.
"What I mean is..."
Seiji let out a low chuckle and walked to stand between the two sisters.
Right in front of Seika, he reached out and pinched Nijika's cheek with unmistakable intimacy.
"The cute, energetic little sister—Nijika."
Then, in front of Nijika, he extended his other hand and lifted Seika's chin with a possessive, provocative gesture.
"...and your tsundere older sister—Seika."
A devilish smile spread across his face.
"You're both my wings."
Time seemed to freeze.
The sisters were completely petrified.
The truth had been ripped open, raw and bloody. Their minds went blank, plunged into chaos.
...
Silence.
After three full minutes of deathly stillness, the first to recover from the shock was Seika.
"You... BASTARD!"
With a furious scream, she lunged at Seiji like an enraged cat.
But her strength was nothing compared to his.
Seiji raised one hand and effortlessly caught her wrist, locking it in place.
"Let go of me! You bastard! I'll kill you! I'LL KILL YOU!"
Seika thrashed and struggled violently. Those proud, defiant red eyes—always so stubborn and haughty—now streamed with tears of humiliation and fury.
Meanwhile, Nijika seemed paralyzed.
She stood frozen, watching the chaos unfold, a bitter curve forming at the corner of her lips.
Sis...
Sis also made a deal with Seiji?
Ah, I'm such an idiot.
I actually thought I'd saved everything... I was even proud of myself for "getting a good deal" from him...
A crushing wave of defeat washed over her.
Utaha and Eriri, watching from the sidelines, exchanged surprised glances.
"...He actually just dropped the bomb like that?" Eriri whispered. "That older sister looks terrifying—like she really wants to kill him..."
"Terrifying?" Utaha shook her head lightly. "She's just an ant trying to stop a chariot."
She glanced at Eriri.
"You've experienced Seiji's... monstrous stamina... yourself, haven't you?"
Eriri's cheeks instantly flushed crimson, memories of certain overwhelming nights flooding back.
...
Seiji ignored Seika's screaming and beckoned to Utaha and Eriri.
The two had been with him the longest. They understood him perfectly.
At his gesture, they immediately rose.
One of them produced a specialized restraint strap, binding Seika's wrists together behind her back.
"Wh-What are you doing?!" Seika's expression turned to panic.
Nearby, Nijika looked worried, about to intervene—
But Eriri was faster.
She pulled out an elegant metal ball gag and deftly fastened it over Seika's mouth.
"MMMPHHH—!!!" (Let me go!)
Seika's cries became muffled whimpers, her eyes filled with terror and confusion.
Once they finished—
"A pleasure to meet you, Seika Ijichi-san." Utaha smiled and gave her an elegant curtsy, her eyes glinting with mischief. "From today onward, we're 'sisters.' I look forward to working with you."
"That's right, that's right!" Eriri chimed in. "From now on, we'll all be 'serving' our mutual 'Master' together! So please don't make such a fuss and cause trouble for the rest of us!"
Seika was utterly stunned.
She stared in disbelief at these two women—both gorgeous and refined, the pinnacle of beauty and elegance—calling Seiji their "Master."
They're such exceptional girls... they should have bright, wonderful futures.
Why would they degrade themselves like this?
"Seiji... those two...?" Nijika looked at Seiji with fear in her eyes.
Being one of Seiji's many women—she could accept that.
But calling him Master, becoming a slave... that was too much.
"...You two, stop stirring up trouble." Seiji sighed, even more exasperated than Seika or Nijika, and lightly smacked both instigators on the head.
"Ow!" ×2
Utaha and Eriri clutched their heads in mock pain.
The "Master" talk had been deliberate—they'd purposely brought their bedroom roleplay into the serious conversation just to mess with everyone.
"Alright, ignore them." Seiji restrained Seika with one hand while pulling Nijika into a gentle embrace with the other. "You haven't done anything wrong. Neither has your sister."
"I'm just... greedy, that's all."
"I want both of you."
Seiji said it with complete composure.
Naturally, it wasn't well-received.
Seika's eyes looked ready to shoot flames.
But it didn't matter.
"...Is that so?" Nijika in his arms showed a complicated expression, but her tense body gradually relaxed.
Nijika really is a good girl.
Seiji thought to himself, then shot Seika a triumphant look.
Once I've got your sister wrapped around my finger, you think I can't handle you?
Then he lowered his head and kissed Nijika's softly trembling lips.
"MMMPPHHH!!!"
Seika thrashed like a fish thrown into boiling water, her eyes blazing with murderous intent.
But Seiji paid her no mind.
She was meat on the chopping block now. There was no escape.
"Learn from your little sister, Seika."
Seiji swept Nijika up in his arms—she was too breathless from his kiss to resist—and laid her down on the wide sofa.
"Utaha, Eriri," he said without turning around, addressing the two "accomplices" who were watching with excited expressions, "please 'escort' our dear Seika-san over here as well."
"Yes, Master~"
"As you command, Master~"
The two responded cheerfully, flanking Seika and dragging her to the other end of the sofa.
She was forced into a kneeling position, made to watch as Seiji began removing her little sister's clothes, piece by piece.
In that moment, Seika's eyes held the fury of a caged lion, ready to tear him apart.
"N-No... don't..."
Nijika finally snapped back to her senses, instinctively pushing away the hands roaming over her body.
It wasn't that she was rejecting Seiji...
She just couldn't do this in front of her sister.
But her meager strength was nothing against him.
"Nijika," he whispered in her ear, his voice a seductive, demonic murmur, "look at your sister."
"Haven't you always felt guilty toward her?"
"Now is your chance to 'make it up' to her."
"Let her watch exactly how you please me. Let her understand what an enormous 'sacrifice' you've made for her sake."
"Isn't that also a form of 'love'?"
Nijika's expression went flat at his twisted logic.
Nearby, even Utaha and Eriri's mouths twitched.
Seika's face darkened like a thundercloud.
"...Fine." But Nijika stopped struggling.
She sighed softly, her voice tinged with helpless resignation. "You're going to do this no matter what I say, aren't you? Nothing I say will make you stop, right?"
Then—
Nijika turned her head and gave her sister an apologetic look.
And then, with a soft sigh of resignation, she wrapped her arms around Seiji's neck.
"?!"
Seika's eyes went wide with disbelief.
Right in front of her horrified gaze—with Utaha and Eriri watching from the sidelines like it was prime entertainment—Nijika let Seiji undress her.
One piece at a time.
Her cardigan slipped off her shoulders. Her blouse was unbuttoned, revealing her modest white bra. Seiji unhooked it with practiced ease, letting her small, perky breasts spill free.
"Nn..." Nijika bit her lip, cheeks burning, but she didn't resist.
Seiji's hands slid down her waist, tugging her skirt and panties down together. The fabric pooled at her ankles, leaving her completely bare.
"MMMPHHH!!!" Seika thrashed against her restraints, screaming into her gag.
Seiji ignored her completely. He laid Nijika back on the sofa, spreading her thighs apart. Her pink pussy glistened—already wet despite everything.
"Look at that," Seiji murmured, running a finger along her slit. "Your body's already ready for me, isn't it?"
"D-Don't say it out loud..." Nijika whimpered, covering her face with her hands.
He positioned himself between her legs, the head of his cock pressing against her entrance. Nijika's breath hitched.
"Watch closely, Seika."
He thrust inside in one smooth stroke, burying himself to the hilt.
"Ahhhh—!"
Nijika's back arched off the sofa, a sharp cry tearing from her throat. Her tight little pussy clenched around him like it was trying to milk him dry.
"Fuck, you're always so tight," Seiji groaned, grabbing her hips. "No matter how many times I fuck this pussy, it still grips me like the first time."
"Hnn... ahh... S-Seiji..."
He started moving—slow at first, dragging his cock out until just the tip remained, then slamming back in. Each thrust made Nijika's whole body jolt, her tits bouncing with the impact.
"MMMPHHH!!! MMMM!!!" Seika was going insane. Tears of rage and humiliation streamed down her face as she was forced to watch her little sister get fucked right in front of her. She could see everything—Seiji's thick cock spreading Nijika's pussy wide, the wet sounds of their bodies slapping together, the way her sister's face twisted with shameful pleasure.
"Ahh! Ahh! Ahh! Seiji—not so hard—sis is—ahhn!"
"Let her watch." Seiji grabbed Nijika's chin, turning her face toward Seika. "Look at your sister while I fuck you. Show her exactly what you've been doing for her sake."
Nijika's teary eyes met Seika's furious ones.
"I'm sorry, sis..." she whimpered. "I'm sorry—ahh!—I'm sorry—!"
Her apologies dissolved into moans as Seiji picked up the pace, pounding into her harder and faster. The obscene squelching of her soaked pussy filled the room.
Seiji laughed. "Getting fucked in front of your sister is turning you on, isn't it?"
"N-No... that's not—ahhhh!"
But her body betrayed her. Her hips started moving on their own, rising to meet his thrusts, her pussy squeezing him even tighter.
"Gonna cum already?" Seiji could feel her walls fluttering. "Go ahead. Cum while your big sister watches."
"I can't—I can't—Seiji—I'm—AHHHHH!"
Nijika's whole body seized up, her pussy clamping down in rhythmic spasms as she came hard around his cock. Her eyes rolled back, mouth hanging open in a silent scream.
Seiji didn't stop. He fucked her right through her orgasm, prolonging her pleasure until she was a trembling, sobbing mess beneath him.
Only when he was satisfied did he finally slow down, leaning in to kiss her tear-stained cheek.
"Good girl."
On the other end of the sofa, Seika sat frozen. Her face was a mess of tears and snot, her wrists raw from struggling against the restraints. The gag muffled her sobs, but the hatred in her eyes burned bright enough to kill.
This was just the beginning.
...
...
In the week following the revelation, a strange calm settled over the Ijichi sisters.
They had no choice but to accept reality.
During the day, they each focused on their own work. At night, they took turns visiting Seiji.
Now that both sisters knew about each other—
Seiji became even bolder, arranging and combining them as he pleased.
Sometimes it was Seika pressed against the living room's floor-to-ceiling windows, the Tokyo night skyline behind her, while she felt the shameful, conquering rhythm from behind—with Nijika nearby in a maid outfit, blushing furiously as she prepared refreshments.
Other times it was Nijika in the steam-filled bathroom, pressed against the glass door, her silhouette visible to Seika waiting outside.
They didn't need to do anything special. Their mere presence was enough to excite Seiji beyond measure.
For instance—when Nijika knelt on the carpet to service him, Seika would sit on the sofa, forced to watch the entire performance. The suppressed gasps, the wet sounds—amplified infinitely in the silent room, becoming a slow torture for Seika.
Seika's body would tense with shame and fury, her nails digging deep into her palms. But there was nothing she could do.
They no longer argued. They simply... saw the marks on each other's bodies, smelled the lingering scent in the air...
And silently looked away.
All of this was observed by the apartment's other two mistresses.
"Hey, Utaha," Eriri said, sketching Seika's expression on her tablet—that complex mix of jealousy, humiliation, and a hint of unconscious longing—"Big sis's eyes are getting better and better! Did you hear her breathing get heavier during the second half last night? I bet she's about to crack and ask to join in!"
Utaha turned a page of her book, unhurried.
"Don't rush, Eriri."
"For a woman with pride as strong as Seika's, physical pleasure is poison—it slowly corrodes her willpower. What Seiji is doing now is making her watch, making her listen, letting jealousy and shame force her to imagine what it would feel like to be treated the same way. Once her body has rehearsed it countless times in her mind... that's when true surrender will come."
"That bastard Seiji really knows how to break a woman."
...
Seiji was observing too.
"Almost there." He leaned back on the sofa, savoring the memory of Seika's body trembling with suppressed need last night, and Nijika's helpless, kitten-like whimpers.
"Nijika is like warm jade—I've sculpted her until she's exquisitely sensitive, flushing beautifully at the slightest touch. But Seika... there's still a beast inside her that refuses to bow."
"She clearly wants it when she's watching, but she keeps forcing herself to hold back."
"That won't do."
Seiji stroked his chin thoughtfully.
...
...
Meanwhile—
In Genesis Entertainment's Studio One, the atmosphere was tense.
Ryo Yamada irritably pulled off her monitoring headphones and hit pause on the mixing console.
"Stop! Nijika, your drums are off again!"
Inside the recording booth, Nijika set down her drumsticks, her face etched with exhaustion and guilt. "Sorry, Ryo..."
"Sorry doesn't fix this!" Ryo massaged her temples, frustration bleeding through her voice. "This lead single is called 'Sorrowful Constellation'! It needs to convey the tenacious strength of someone still fighting despite overwhelming grief! But what you just played was—"
"Empty! Hollow!"
Nijika hung her head, bitter anguish in her heart.
Tenacious strength?
Every day it's either me watching Sis, or Sis watching me. Our dignity is shattered on the floor.
What strength is left?
Just then, the studio door swung open.
Seiji walked in, with a reluctant-looking Seika beside him—his hand casually resting on her rear.
That was the source of Seika's reluctance.
"What's wrong?"
The moment Seika entered, she noticed Nijika's dejected state and Ryo's helpless expression.
Discreetly, she swatted Seiji's wandering hand away.
Ryo pointed at the sheet music. "Manager, have a listen."
She played back the recording.
A hollow, lifeless drum track poured from the high-end monitors.
Seika's expression shifted slightly.
As a veteran musician, she could hear it better than anyone—the signal of a withering soul hidden beneath those beats. And the source of that withering was standing right next to her—the root of all evil!
Seiji Fujiwara!
Anger surged, but she forced it down.
Seika knew rage wouldn't solve anything.
She took a deep breath, turned, and addressed Seiji with reluctant resignation.
"Seiji..." she forced the name through gritted teeth, "...what do we do about this?"
Nijika raised her head too, looking at Seiji with hopeful eyes.
"Simple..."
A familiar smile spread across Seiji's face.
Ryo sighed internally.
Here we go again...
This guy's 'tutoring sessions.'
What kind of deal is he going to make this time for so-called 'artistic inspiration'?
"Do you know what this song is missing?" Seiji asked slowly.
The sisters said nothing.
"It's not missing 'hope,'" Seiji continued. "It's missing a new kind of 'resilience'—one that's born only after experiencing the ultimate depths of pain and humiliation. And that kind of emotion can't be taught through simple technique."
Yes, exactly.
Seiji thought coldly to himself.
They've started getting used to ordinary pleasure.
I need a more profound method—to make both sisters fully accept reality, and then rebuild their passion for life on the foundation of 'becoming my women together.'
Not this silent resistance they're doing now.
Seiji had no doubt he would succeed.
The modern institution of monogamy was fundamentally about property rights, not emotions.
Monogamous morality was just the morality of ordinary people.
Once fixed notions were shattered, once social conditioning was escaped, accepting new realities became natural...