"Ryosuke, is barley tea okay?"
"Yeah, sure. Thanks."
Manaka heard her younger brother-in-law's reply from behind as she retrieved a jar of homemade barley tea from the refrigerator and prepared some ice.
She reached for the glasses in the cabinet—
There, she hesitated slightly. It was a two-person apartment, and there was only one set of glasses. These were the glasses Manaka and her fiancé used.
"..."
A pang of guilt twisted her chest, causing her pain. Yet, at the same time, she felt a thrill of excitement, which she despised herself for.
Manaka poured barley tea into the two glasses and carried them to the living room.
"Thanks."
Her younger brother-in-law replied casually, sitting on the sofa with his upper body still bare.
Of course, Manaka wasn't in a position to criticize his attire.
She was only wearing a T-shirt she'd grabbed from the floor, leaving her lower half clad only in underwear—a scandalous state of undress.
Evening—though in this season, it was still bright at 5 PM.
Sunlight streamed through the thin curtains into the living room, where he stood.
Manaka glanced down at the glasses she had set out, and Ryosuke's eyes narrowed slightly. She couldn't tell what he thought of the matching pair.
But...
Her heart began to race again.
Even his silent gesture of picking up the glass. Even the sound of his throat as he swallowed, the profile of his face.
"What?"
"W-what do you mean?"
Noticing her gaze, Manaka hastily grabbed her glass and drained it in one gulp.
Truthfully, her throat was parched. Despite the air-conditioned room, they had just been having sex in the bedroom next door. The lingering heat from their earlier encounter still burned through her body.
Ever since that day.
Ever since Ryosuke had come to this room for their long-awaited reunion, their relationship had reignited.
She had left that house to end this very relationship, to prevent this from happening.
But it was Manaka who had revealed her fiancé's absence.
I tried to forget...
Once the memory resurfaced, there was no stopping it. The wedge driven deep into her core throbbed, leaving her no choice.
Savoring the cold liquid sliding down into the depths of her chest, Manaka set her glass on the table.
"..."
Ryosuke remained silent.
His cup of barley tea was still half-full.
It was a strange feeling.
He was someone she shouldn't be with. Someone she shouldn't touch anymore.
Yet, with each breath, instead of subsiding, the lingering embers seemed to burn hotter.
"...Ryosuke," she murmured, leaning against his shoulder and pressing a kiss to his chest.
The skin of this younger man felt almost irritatingly smooth.
As the places their lips touched multiplied, Ryosuke's arm wrapped around Manaka's waist, pulling her close with slow, irresistible force.
"Mmm, ah..."
Lips met lips, arms entwined, fingers intertwined, and happy times returned to Manaka once more.
"Ryosuke, here..."
She stroked his lower abdomen, unzipped his pants, exposed him, and kissed him there.
"Mmm... Nn. Smack... Mmph!"
"Sis..."
The tremble in his voice as he called her that brought her joy. Manaka took his penis deeper into her mouth, using the mucous membranes at the back of her throat to intensify his pleasure.
"Mmmf, gurgle... slurp..."
A deepthroat that used every inch of her mouth. She bobbed her head up and down, making lewd noises as she sucked fiercely.
"Smack, slurp—smack, smack, smack...!"
I've never given a blowjob like this to my fiancé.
"Older Sister, after all that just now... is it still not enough?"
"Nnnngh—!"
She shook her head in denial, but it was utterly unconvincing. Kneeling on the sofa in a four-legged position, her hips swayed beneath her underwear as she hungrily devoured his penis with her cheeks hollowed out—she looked utterly defeated.
Ryosuke's arm reached out, his fingers brushing against the swell of her breasts. When his fingertips pinched her downward-pointing nipple, a tingling pleasure shot through her.
"–Hnn, mmm, ngh, mmf...!"
The force of his hands kneading her breasts through her T-shirt was unbearable. I want to keep going until he comes...
Just as she was thinking this, Ryosuke pinned her down. Using his arm strength, he flipped her onto her back and tore off her shirt.
Manaka's large breasts spilled out with a soft bounce.
"...Ngh, it's too bright here."
"What's the point in complaining now? Besides, I was the one who invited you here."
"–Ngh, ah, ah..."
Ryosuke knew better than Manaka herself what made her feel good.
He shook her, bounced her, thrust into her, and pushed deeper. He gently bit her lips and lavished her with impossibly skilled oral caresses.
"–Ngh... Nnnngh...!"
Her entire body quivered with pleasure.
(I want this to last forever, with him...)
The sensation, etched into Manaka since her first skin-to-skin contact with her younger brother-in-law, had never faded; rather, it had grown even sharper.
She couldn't forget it now. She couldn't escape it. She didn't want him to let her go—
"Ryosuke... Come... Come inside me...!"
Unable to bear it any longer, she pleaded, letting out a lewd cry.
Ryosuke smirked faintly as he thrust his stiff, swollen penis into Manaka's slick folds.
"Ah! Ah, ah...!"
Her entire body lit up with pleasure. Just being connected to him sent shivers of ecstasy through her. Her slick, glistening vagina reveled in being violated by her younger brother-in-law's cock.
"Aah! No, stop—!"
Manaka arched her back from the pleasure, but Ryosuke pinned her down, pounding into her with relentless force. The pace quickened, the wet, slapping sounds of their coupling echoing throughout the room as frothy love juice dripped onto the sofa cushions.
"Ah! Ah! Ah—!"
Deep within Manaka, their mutual pleasure exploded.
"Aaaaah—! Ah, nnn...!"
Since that first day they'd had sex, he was the one she'd shared the most skin with. In that house, they were accomplices who had repeated the unspeakable act countless times.
Manaka was the one who taught Ryosuke the pleasure of sex. After that, it was her fault for letting him seduce her—and sometimes even seducing him herself. It was her fault for becoming addicted to this forbidden relationship, for sharing this taste with him.
"Haa... haa... ah... ah..."
Manaka could no longer let go of the pleasure she had discovered.
I'm sorry, Ryosuke... But it just feels so good...
Shuddering with pleasure, she clung tightly to her younger brother-in-law's back. The sensation of feeling his pulsations inside her was so intense it almost numbed her.
They remained entwined like that for a while, until Ryosuke suddenly spoke.
"Older Sister. I have something to report."
"...Huh? What do you mean, so formally?"
"I have a girlfriend."
The abrupt confession made Manaka doubt her own ears.
I was well aware that my younger brother-in-law had many women in his life. He never confessed it himself, but for some reason, my younger sister, Marin, often reported on his affairs. There were even times when I ran into Ryosuke's "guests" at home.
Yet until now, Ryosuke had never acknowledged these relationships as actual affairs in front of us. ...Or perhaps he never even recognized them as such himself.
What kind of change in heart was this? Why was he suddenly talking about this now? Unable to grasp his intentions, Manaka ended up asking a foolish question instead.
"But... how can you do this?"
"You're asking me that?"
His whispered reply, tinged with mockery, made her uncomfortable.
"Well, yeah..."
Fresh waves of guilt spread through her chest, making it ache. She didn't even deserve to feel that way.
"...Sis, getting worked up again?"
"N-no—I just..."
Ryosuke slowly began moving his hips again.
"S-stop... mmh... mmh...!"
His languid movements gradually stimulated Manaka's erogenous zones, driving her to climax again in mere seconds.
"Ah... Ahhhhh...! Mmm... Don't just distract me!"
"After letting you feel this good, do you really think a lecture will work?"
"You..."
"Despicable, right? I know. My cowardly streak... I think I got that from Older Sister."
"...Hmph. And your penchant for testing people? You're just like Marin."
"Haha. She's a little too... unconventional."
"You... we... probably don't want to hear that, do we?"
Manaka had played a part in shaping even Marin's personality.
My younger sister had always been extremely clingy to me, but after Manaka started dating—after her relationship with her current fiancé became official—she had less time to pay attention to her.
That's when my mother remarried, and we moved in with our stepfather and Ryosuke.
At first, Marin didn't bond with Ryosuke at all, so I imagine she must have felt lonely in this unfamiliar home... I don't know if she felt lonely. Even now, despite being her own sister, it's still very difficult to glimpse her inner thoughts.
Anyway.
Amidst this blended family life, Marin, with her keen intuition, seemed to have realized early on that something was developing between Manaka and Ryosuke.
And this is where my younger sister's behavior becomes truly puzzling. Instead of despising them for their illicit affair, she somehow developed an even stronger affection for them, particularly opening up to Ryosuke.
...Perhaps it's more accurate to say that Manaka didn't so much "corrupt" her younger sister as give her the trigger to discover her own inclinations.
Then what about this younger brother-in-law?
"I'll be enough in his place."
The words Ryosuke uttered during their tryst, at some point, resurfaced in her mind.
Perhaps Ryosuke's keen insight stemmed from his desperate, unconscious desire to be loved by others—and the gravest sin Manaka committed was giving him that successful experience.
By teaching him the art of connecting through pleasure, she inadvertently ensnared herself in his thrall as well.
If that's true—
"Older Sister, again."
"Huh? Ryosuke...!"
It's too late to regret doing something irreparable.
A single stroke of his finger leaves my thoughts tangled, a kiss steals my body's autonomy, and his voice alone can lead me to climax.
Even an "expression of affection" toward my younger brother-in-law is this intense. If Ryosuke ever found someone he truly cared for and poured his heart and soul into loving her...
"...nngh!"
The mere thought sent shivers down my spine—fear, and perhaps a hint of jealousy. No, Manaka, you have no right to feel this way.
"Ah... no, ah, ah..."
As my younger brother-in-law violated me on the sofa, all self-reflection, regret, rationality, and guilt were washed away, and Manaka sank once more into the ocean of pleasure.