32. Pure Sister-in-Law Da-hye Shocked After Witnessing Brother-in-Law and Unnie's Beastly Mating Sex.
32. The Pure Sister-in-Law Da-hye, Shocked After Witnessing the Beastly Sex Between Brother-in-Law and Her Older Sister
'Sex... sex...? Brother-in-law and unnie are having sex...?'
It wasn't as if Seo Da-hye hadn't known from the start that Brother-in-law Geum Tae-yang and her eldest sister had an unusual relationship.
That's why she had even asked about their contraception situation during their first meeting.
She had accepted their intimacy so naturally back then, but ever since Tae-yang visited the penthouse, something felt different.
'That kind, innocent brother-in-law... The one who seemed so earnest and incapable of acting recklessly toward others...'
After that day, the image of Geum Tae-yang in Da-hye's heart had transformed beyond just a good, dependable brother-in-law—into something akin to a prince straight out of a fairy tale.
And now, that very prince was panting heavily, entwined with her sister.
Me] Unnie, are you busy?
Loving Big Sister Mi-na] Not exactly busy, just having sex with your brother-in-law.
Me] S-sex...?
Loving Big Sister Mi-na] Yeah.
Sex at the most unexpected time, no less.
Me] Mom said we absolutely have to go see Grandpa.
Loving Big Sister Mi-na] Really? Ugh... what a hassle. Fine, I'll talk to Mom myself.
Me] Okay... Enjoy your happy love with brother-in-law...
Loving Big Sister Mi-na] His love isn't the kind you just "enjoy."
Loving Big Sister Mi-na] It's the kind you have to risk your life to receive.
Me] ;;
The image of brother-in-law that unnie described during sex was so different from the one Da-hye held in her heart.
It was like... the figure of a hero from myth? Or perhaps something half-human, half-beast.
Our Brother-in-law] Da-hye, have you eaten dinner yet?
Me] Yes... Have you, brother-in-law?
Our Brother-in-law] I ate right after work!
'Hmm... He texted me right after having sex with unnie...?'
And so, Seo Da-hye began to harbor a very peculiar thought.
'Is unnie just making this up to mess with me?'
Unnie must be playing a prank on her.
Brother-in-law wasn't the beastly man unnie made him out to be.
'Ah...! To think brother-in-law has that side to him... I thought he was just a kind prince, but he's a prince with the qualities of a leader...'
But today, she had seen that same brother-in-law—who had looked so nervous in the elevator, stirring up maternal instincts in her—transform into an alpha male so commanding that he disarmed her mother, Kim Seo-yeon, in front of the employees.
And that wasn't all.
Huff...! Huff...!
'The female employees are talking about brother-in-law...'
Belatedly, Da-hye too began experiencing the precursor symptoms of Tae-yang's Femme Fatale effect.
'Unnie, this isn't normal!'
Because of those two experiences,
Da-hye instinctively sensed that while their mother was away meeting VIP CEO Jung, her sister Seo Mi-na was about to do something outrageous.
After all, unnie was practically addicted to sex with brother-in-law—she claimed to be in the middle of it every time she texted.
'Why am I like this?'
But then, as if drawn by some force, Da-hye found herself acting in ways that even she couldn't understand.
Seo Ji-eun, who was supposed to be relaying messages, couldn't take calls during class. Yet Da-hye lied, saying she'd be on a long call with brother-in-law and unnie.
'What's wrong with me...? Why am I like this...!'
Not only that, she even went downstairs as if to give unnie space to do whatever she was planning.
'Th-this doesn't feel right...'
But of course, it didn't end there.
'I'm not... following them, am I?'
She pretended to leave but stopped at the stairwell corner,
and when unnie dragged brother-in-law away like some prize, Da-hye's eyes shamelessly feasted on their retreating figures.
Why? Because she wanted to secretly trail after them.
'I'm just... making sure things don't escalate too much... That's why I'm following...'
And so, she began stalking them.
Under the flimsy pretense of being their shadow attendant, like some dark retainer.
'Haaa... This excitement is different from before... Am I a weird girl...?'
Even as she chased after them, Seo Da-hye couldn't control her pounding heart.
But this was a familiar lack of control.
After all, she had already experienced her first act of deviance—stalking Ji-eun.
'I-It's probably just unnie showing brother-in-law around Mom's office... That's all it is...'
After hesitating briefly upon reaching the 13th floor, Da-hye stood before the door to CEO Kim Seo-yeon's office.
Behind it, something irreversible was likely unfolding—something she would never be able to unsee.
Her last line of defense squirmed within her heart.
'So if I go in, it's not really a problem...'
That defense mechanism was quickly rationalized away.
Because, deep down, her desire to witness that event was far stronger.
Seo Da-hye ultimately stepped inside the office.
'They're not here...! They're not here...!'
She then checked the terrace, the executive room, the reception area—as if confirming something.
She already suspected brother-in-law and unnie had gone into the bathroom.
But this cunning, meticulous girl was also considering the possibility of someone else being present—
that is, covering for any oversight her sister might have made in her haste.
Sssk...!
Having fulfilled her role as a shadow retainer, Da-hye cautiously pushed open the office bathroom door.
"What the hell are you doing?! What kind of manners are these, giving a bathroom tour?!"
'I knew it! Brother-in-law is furious!'
What greeted her was an explosive outburst from Geum Tae-yang—one she had never heard from him before.
"Ghk—! You crazy—! Ugh—!"
'Hyaaah! Brother-in-law sounds like he's being overpowered! But why do I hear kissing sounds?!'
She expected brother-in-law's outburst to be followed by logical scolding and unnie's shameless excuses.
That would've been the normal reaction, right?
But what followed were helpless, defeated noises from Tae-yang—
and worse, those noises were being coaxed out by the unmistakable sounds of Seo Mi-na's kisses. Da-hye couldn't contain her shock.
"Snap out of it! This is a bathroom! What if someone walks in?!"
"Only Mom or our family can come in here."
'Right... Listen to brother-in-law and snap out of it, unnie... I'm the one who walked in!'
But unnie's dominance meant the two were unlikely to leave the bathroom stall anytime soon,
so Da-hye slipped into the second stall, positioning herself closer to eavesdrop on the battle.
"Anyway, Mom or Da-hye could still show up!"
"Fuck, I'm horny right now—you expect me to care about that?!"
Rustle! Rustle! Rustle!
'Hyaaah! Unnie's cursing at brother-in-law like that?!'
Sure, she had seen them bicker before.
But hearing unnie hurl such vulgar, shameless curses at brother-in-law was still a shock.
"Stop! This isn't right! Mi-na, if you're the daughter of Galleria Cheongdam's CEO Kim Seo-yeon, you can't act like this!"
"Yep! Our mom quit being an idol because she got pregnant with me. So as her daughter, I can do this."
Shhk! Shhk!
'What is unnie doing?! It sounds like she's taking something off...?? Wait, brother-in-law's pants?? In the bathroom??'
Brother-in-law's desperate resistance could be heard.
It sounded like a reprimand, but it was unmistakably helpless.
Amidst it all, the sound of clothes being pulled down—
Da-hye pressed her ear flush against the stall divider, imagining the scene as if she were seeing it firsthand.
—Thuuuunk!!♡
"You're gonna act all high and mighty with a dick like this? You want to fuck me just as much."
"Damn it! Are you a savage?! Even if your body's turned on, there are times you have to resist with your mind!"
'D-dick...? Brother-in-law's dick...!!???'
Da-hye realized with absolute certainty that Geum Tae-yang's bare cock had been exposed.
Her already wide eyes grew even larger, turning into saucers,
as her trembling lips silently mouthed the words brother-in-law's dick.
"Keep resisting. The more you do, the hotter I get. Schllurp!Pop!♡"
"Tsk—! Seo Mi-na!!"
'What the hell?! What's happening?!'
Along with her crude remarks, Seo Mi-na was producing equally crude, wet noises—
and brother-in-law Geum Tae-yang cried out her name in shock.
Unable to comprehend the situation, the inexperienced virgin Seo Da-hye
was a mix of agitation and confusion, her eyes darting up, down, left, and right without rest.
"Pwaaah!♡ Pop! Schluup! Schlluurp!♡ Slurp-slurp!♡ Schlurp!Schlurrrp!♡"
"Ghh—! You little—!"
'U-unnie is... doing that to brother-in-law's...! That thing...!'
Then came sounds even an inexperienced girl like Da-hye could understand.
'She's sucking it...'
The sound of a dick being sucked—
Having sucked Tae-yang's cock over a hundred times in the month since they started their relationship,
Seo Mi-na filled the luxurious 13th-floor bathroom of Galleria Cheongdam with the most obscene, mind-blowing blowjob noises imaginable.
"Such a huge dick... Schluuup...!Pop...!♡ Our Tae-yang's cock is a real monster... Haaarrrp!Pop!♡ Schlurp...!
So fucking delicious... Schlurrrrp...!♡ Schluup!♡"
The quality of the blowjob wasn't the only thing that stood out.
Seo Mi-na's filthy praise of Geum Tae-yang's cock was so obscenely slick that it could hardly be matched.
At this point, it was practically an art form.
"M-Maljaji...? Brother-in-law's... that thing...?"
Amidst the lewd commentary, Seo Da-hye absorbed a shocking piece of information.
Her sweet, pure brother-in-law—the one with princely looks—had, according to her sister, a maljaji nestled between his legs.
"This is Mother's workspace... I can understand being turned on enough to have sex here, but at least tone down the dirty talk, Mi-na..."
And yet, with a face as elegant as Kim Seo-yeon's, she was saying these things.
While sucking and slurping on a monstrous, veiny 23cm maljaji.
Tae-yang, sensing the vulgarity had gone too far, tried to rein her in.
"Brother-in-law is right... The things being said right now are too filthy even between lovers... You wouldn't even say this to an enemy..."
Seo Da-hye vehemently agreed with Tae-yang's sentiment.
"Why? You love it when I talk like this. Chu-ber-rup! Churup!♡ Are you embarrassed? That I'm sucking your cock jjo-weup! Harup!♡ Chu-beru-rup!♡ in Mom's workspace? Harururup!♡ Chuaaaap! Churururup!♡"
Squelch!♡ Squelch!♡ Squelch!♡
"W-When did I ever say I liked it?!"
But Mi-na only smirked, as if the very idea was ridiculous.
Then, just like in his semi-basement room, she began fondling Tae-yang's balls greedily, lavishing even more obscene affection on her fiancé's cock.
"Brother-in-law... likes it when she talks like that...?"
Seo Da-hye covered her mouth, unable to hide her shock.
The kind of language that belonged in a brothel—and Brother-in-law liked it when her sister talked to him like this?
"Then... the things Sister told me about Brother-in-law... were they... true...?"
The implications were clear.
Everything Seo Mi-na had ever described about their bedroom activities was real.
"Look at how much Cooper's Fluid you're leaking... You wanna stuff that cock into my pussy and fuck me raw, don't you...?"
Squelch!♡ Squelch!♡ Squish! Slick!♡ Slurp! Squelch!♡
"Ghhh—!"
"Brother-in-law isn't even denying it... And what's this about him... leaking...?"
Shiver, shiver, shiver.
With a voice dripping with lust, Mi-na squeezed Tae-yang's massive cock in both hands, emphasizing the unending flow of her fiancé's pre-cum.
Unable to deny what his own cock was doing in good conscience, Tae-yang opted for silence—but to Seo Da-hye, that silence was as good as an admission. Her hands trembled violently as she struggled to process reality.
"Say it... You wanna do it with me too, don't you, my fiancé? I wanna hear my man's true feelings..."
Squeeze...! Squeeze...!
"Nngh—!"
Shifting tactics, Mi-na pleaded with him like a desperate lover, demanding an enthusiastic response—but the way she mercilessly teased his oversensitive glans reeked of coercion.
"Fuck, you goddamn slut, Seo Mi-naaa!"
Tae-yang's moral compass, which had been desperately clinging to the idea that fucking in his future mother-in-law's workplace was wrong, finally hit its limit.
"Y-Yeah... I wanna do it... I wanna make love to you right here, my delicious sshibboji..."
The beast who had been railing Mi-na's pussy nonstop for the past month finally bared his fangs.
"S-Sshibboji... sshibboji...?"
Shakeshakeshakeshakeshake.
After saying it so many times, the vulgar term had practically become second nature to him—and now, hearing it spill from the lips of the brother-in-law she respected so much, Seo Da-hye failed to reject reality. Her face paled as she trembled like a leaf.
"Got it, my love... I'll serve up the sshibboji you love so much..."
Grin...!
Meanwhile, Mi-na, having successfully shaped reality to her liking, couldn't hold back a satisfied smile.
"My pussy... the one you took my virginity with... I'll serve it right up..."
Rustle! Rustle! Rustle!
As if mistaking the bathroom stall for their honeymoon suite, she began stripping with reckless abandon.
Shlick! Slither! Slip!
"H-Hyaaah! S-Sister?!"
She was really taking everything off.
Her jacket and miniskirt were practically thrown onto the bathroom stall divider, snapping even Seo Da-hye—whose mind had already been shattered by Tae-yang's coming out—back to attention.
After all, if clothes came flying over into the second stall, she might get caught too.
"Look at you, already standing at attention like a massive cow's udder... Have some shame, Seo Mi-na..."
"Hnnngh...! Says the one with a maljaji so hard it might explode...?"
Sssssssssk—!
She plopped her bra right onto Tae-yang's head.
Looking utterly ridiculous, Tae-yang tried to salvage his pride with a half-hearted protest—but Mi-na, gripping the waistband of her panties, only humiliated him further.
"And this one's in an even more impressive state..."
Swoooosh!♡
Down went Mi-na's white panties.
"I wanna ride your cock so bad... that I'm like this... all lewd and wet..."
Drip...! Drip...!♡ Trickle...! Drip...!♡
The exposed virgin bride's pussy was gushing out love juices like running tap water.
Huh... unnie's peeing... I can hear her peeing...
It was so excessive that the sound of the juices hitting the floor registered in Seo Da-hye's ears as the sound of someone urinating.