"Big sis Sayuri, has this gotten even bigger here?"
Nanaya was lying on the bed with Sayuri, kindly helping her solve her 'swelling' problem.
"Mmm... go easy on the sucking, ah~!"
"Bad boy, don't bite there!"
Sayuri lightly patted Nanaya's back.
Like a good older sister disciplining her mischievous younger brother.
Except what they were doing right now was anything but normal sibling behavior.
"Ah! Nanaya, once it grows bigger... it won't go back..."
Sayuri's voice carried a hint of pleading.
The more she interacted with Nanaya, the harder it became for Sayuri to refuse his demands.
She couldn't resist his movements anymore.
At first they could still manage on the couch.
But as their encounters grew more frequent, their battleground moved to the kitchen, then the bathroom.
Finally, they'd reached the bed.
As Sayuri indulged Nanaya more, his actions grew increasingly bold.
After thorough inspection, Nanaya had confirmed Sayuri was still untouched.
This pure young married woman was now completely at his mercy, letting him play with her however he wanted.
Nothing gave Nanaya greater satisfaction than this.
Her usually pristine body now squirmed under his sinful hands, moaning with unrestrained desire.
It only made Nanaya crave more.
While Sayuri tolerated Nanaya's advances and helped relieve his "swelling" problem with her hands, mouth, and even her meltingly soft thighs...
She absolutely forbade actual penetration.
Nanaya had tried several times without success.
Now Nanaya wrapped his arms around Sayuri's neck, pulling her down.
Sayuri offered no resistance.
She obediently lowered her head, offering her smooth, fragrant tongue for Nanaya to suck on.
Sayuri's arms also tightened around Nanaya's neck as they embraced like passionate lovers.
Having gained some experience, Sayuri actively met Nanaya's tongue with her own when he pulled her close.
When Nanaya paused, she took initiative—twining her tongue around his, licking and caressing before suddenly taking charge, sucking and nibbling.
Their movements grew increasingly heated.
A faint milky sweetness passed between their lips.
Utterly intoxicating.
Nanaya's hands began wandering across Sayuri's body as their perfectly synchronized movements brought them both indescribable pleasure.
...
Eriri felt inexplicably restless and asked to rest in the infirmary.
Passing the first-year classrooms, she glanced inside.
Kato Megumi was there, but the seat beside her was empty.
Was Nanaya absent?
Eriri's expression changed as a thought struck her.
She ran from school and hailed a taxi home in a hurry.
Unsurprisingly, she saw familiar shoes at the entrance.
Nanaya's.
"!!!"
Why? Why did Nanaya keep coming to her house to see her mother instead of her?
Gritting her teeth, Eriri crept upstairs.
The living room was silent.
No signs of activity in the first-floor bathroom either.
Reaching the second floor, Eriri listened carefully.
No sounds from the bathroom.
That left only one place.
Outside her mother's door, the voices were unmistakable.
"...You're such a bad little brother."
"What can I say? My big sis is just too irresistible~"
Nanaya's voice made Eriri instantly imagine what they were doing inside.
Because she'd done the same things with him before. But her tsundere nature and shame had kept her from seeking him out again afterward.
And Nanaya had acted like nothing happened between them, never coming to find her either.
Because Eriri had once heard Nanaya say—though it was in her mother's bed—that he truly cared for her.
But...
Why had things turned out like this?!
Eriri slumped weakly against the door, slowly sliding down.
The sounds inside grew clearer. Despite the soundproof door, every moan reached Eriri's ears perfectly in the silent house.
"Remember your promise—absolutely no going inside!"
"I know, I know. Just focus on your movements, big sis. I'm completely at your mercy right now."
"Hmph, you'd better behave!"
Sayuri was currently straddling Nanaya.
Though she didn't understand why he'd suddenly made this request, her excessive doting made her agree anyway.
Her legs wrapped around Nanaya's waist.
Grinding against him.
Soon, moisture provided natural lubrication.
Making their back-and-forth movements smoother.
"Mmm~~"
Sayuri's moans came continuously.
"Sayuri-nee, do you think we're being unfair to Eriri like this?"
Nanaya's deliberately weak voice made him sound like the victim here.
"Hah~ Why bring up Eriri now...?"
Being pressed so intimately against Nanaya, Sayuri immediately recognized his reaction.
Within seconds, she realized this was just her naughty little brother's dirty fantasy.
Unlike her tsundere daughter, Sayuri had no reservations about acting on her desires.
If anything, this only excited her more.
"Naughty boy, look—do I look like Eriri like this?"
Sayuri gathered her disheveled hair into twin tails.
They bounced up and down with each of Nanaya's thrusts.
Her mature face combined with this hairstyle really did give Nanaya the illusion of being with Eriri.
"Eriri, does this feel good?"
"Mmm~ So good~"
Sayuri's deliberately girlish voice perfectly imitated Eriri's tone.
Outside the door, Eriri burned with humiliation upon hearing her mother roleplaying as her during sex with Nanaya.
AHHHHH!
What the hell was Mom doing?!
Why were they playing this kind of game?!
Eriri was all too familiar with this playstyle.
Her mother had raised her on this kind of imitation play—she'd drawn enough doujinshi featuring these scenarios to fill a library.
But who could have imagined her own mother would reenact them?!
And the character Mom was cosplaying during sex was her own daughter!
"Eriri, your movements are too small. Let me help you."
The sounds from inside intensified.
From her mother's sudden loud moan, Eriri could tell she was reaching new heights of pleasure.
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