34. Younger Sister-in-Law Da-hye Secretly Films Brother-in-Law and Older Sister's NTL(?) Sex, Revealing Their Depraved Natures.

"Our foolish Tae-yang's cock... Hnggggh...! Since it seems like you're having trouble moving, should noona take the lead and ride you first...? Haaahhh...! That's okay, right...? Hnnngh...!"

Slosh...! Slosh...! Slosh...!

Squelch...!♡ Schlurp...! Plap...!♡ Squelch...!

"You were born later than me, yet you're acting like a noona... Grrrrr..."

"You're so cute, our Tae-yang... Mwah...!♡"

Noticing that Geum Tae-yang's resistance had somewhat weakened, Seo Mi-na rocked her hips back and forth, greedily swallowing her future husband's cock inside her pussy.

The key point here is that his resistance had only weakened slightly.

In other words, if she misjudged the pressure even a little, he'd cum instantly.

Seo Mi-na was skillfully walking the tightrope of edging him,

and in the face of the pleasure born from that skill, Tae-yang could only resist with his mouth.

"Our Tae-yang is weak here... Haaah...! That's why noona is doing this... Hnggh...! Like this...? T-hnggh...!"

Schlick...! Squelch...! Plap...! Schlrp...! Plap...!

"Not bad...! Heh! Seems like you know how to handle your little brother..."

Twitch! Ugh—twitch!

With her confidence surging, Seo Mi-na ravaged every inch of Tae-yang's cock as if giving a sex lecture.

Tae-yang could only twitch helplessly,

and with his sister-in-law listening from the next stall, he was on the verge of showing nothing but the pathetic display of a weak male.

"T-hngghhh...! Hahhh...! Hnggh! Hahhhh...!"

Plunge...!! Squelch...!!♡ Plap...!! Schlurp...!!♡ Thrust...!!♡

"Heheh, noona... Your little brother's cock isn't so easy to handle, is it? It's not just filling your pussy—it's about to burst it open, right? Keep disciplining me, noona...?"

No.

Geum Tae-yang was fundamentally a man of asymmetrical power.

Once the cock-and-pussy play truly began, dominance instantly shifted to Tae-yang.

With his 23CM forearm-sized cock filling and stimulating every inch of her pussy, technician Seo Mi-na lost all capacity to play coy in the face of such overwhelming size.

'How does that kind of sound even happen...? Is that really the sound people make when they have sex...?'

The sheer presence of that massive cock reached Seo Da-hye in the next stall.

The obscene squelching sounds defied belief.

For a moment, Da-hye nearly stuck her head under the partition.

It sounded like a paddle was being dragged through a swamp.

"Louder, noona... You don't moan like this in the semi-basement, do you? You scream like a complete animal there. What, are you holding back? Afraid someone might hear what's happening right now?"

Squelch—!

Thrust! Thrust! Thrust! Thrust!♡

"T-hahhhh! Hahp! Hahhhh! Hngghhh!"

Having seized control, Tae-yang gripped Seo Mi-na's 41-inch bubble butt and began slamming into her even more recklessly.

Because he had seen the usually unshakable pervert Seo Mi-na showing weakness.

This man, Geum Tae-yang, had asymmetrical combat power—the moment his opponent showed vulnerability, his sexual aggression skyrocketed exponentially.

Back when they had sex in the studio apartment, Mi-na would scream as if daring anyone to listen,

but here in her mother's workplace, she couldn't do that.

'B-Brother-in-law... is manhandling unnie...'

As a result, Seo ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Da-hye found herself stunned by another aspect of the situation.

The Geum Tae-yang she had witnessed with Seo Mi-na before was the gentlest man alive.

He was the epitome of a considerate partner, doing his utmost to accommodate her eccentric older sister.

Yet now, that same brother-in-law was training her like a professional male dom.

"Hahhhhk! Shut uuup! Hngghh! It's because your stupidly huge cock is suffocating me! Hahp! Hahhhh! ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠It's not a human dick, yours is—T-hnggh! Hah!♡"

Rock! Rock! Spin! Rock!

Squelch!♡ Schlurp! Splurt!♡ Squish!♡ Splurt!

"Is that so? Then how about we make love not in the bathroom, but on Mother's office desk?"

"Y-You're insane!!"

Flustered, Seo Mi-na tried to assert her dominance by swinging her hips in circles.

But once the tide had turned, Geum Tae-yang in high spirits was unstoppable.

With a look in his eyes that suggested he might actually go through with it, he proposed an even more outrageous location.

And in that instant, Mi-na was utterly stunned—

because the place Tae-yang mentioned was none other than her mother Kim Seo-yeon's office desk.

Oh, and by the way? That desk had CCTV.

Meaning, he was outright threatening to show her mother.

Geum Tae-yang had completely lost his leash.

"Scaredy-cat Seo Mi-na! A weak bitch who only knows how to throw tantrums! The moment my cock's inside, you can't even move, my love!"

Smack! Smack!

"Nghahhh! Hah! You stupidly huge-dicked! Hahhh! A beast with a monster between his legs! T-hah! Hahhh! Hnggh!"

Plunge! Slam!♡ Squelch! Splurt!♡ Thrust! Plap!♡

Having established absolute dominance in sex, Tae-yang spanked Mi-na's ass while mixing affectionate taunts into his words.

Mi-na resisted with increasingly vicious comebacks,

but the way she clung to Tae-yang's neck and buried herself against him was unmistakably the posture of a woman whose submission had been cemented—her femininity surging uncontrollably.

'Now that I think about it... unnie always listened to brother-in-law at crucial moments...'

Geum Tae-yang was the classic "submissive by day, dominant by night" type.

That was why he yielded endlessly in daily life.

But whether it was due to the deeply ingrained sexual hierarchy,

Seo Mi-na had actually been unconsciously submitting to him all along.

For example, visiting Kim Il-do—

even Kim Seo-yeon had struggled to persuade her, but Tae-yang's involvement had resolved it.

Now, witnessing Mi-na's feminine resistance, Da-hye recalled that incident.

'Have I never truly understood brother-in-law until now...?'

Back then, she had dismissed it as them just having good chemistry.

But hidden in those details was Tae-yang's true nature.

The silent, overwhelmingly dominant alpha male Geum Tae-yang.

Feeling his majesty, Seo Da-hye's eyes glazed over momentarily.

'Even though I wanted... someone to see ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠me like that...'

For some reason, she felt an inexplicable pang of guilt.

"Fine! Since my precious bride is so shy, I'll hold back on dragging you out there. But!"

Thud—!

"Hahhhhk! W-What are you doing?!"

Tae-yang roughly grabbed one of Mi-na's thighs with one hand while wrapping the other around her waist, then stood up.

"I need to hear proper screams from those pretty lips. I won't tolerate such half-hearted moans when you're having sex with me."

Slam—!

"Hahhhhk!"

—Crash!

Then, with a rough shove, he pressed Mi-na's upper body against the firmly locked bathroom stall door, forcing her to lean against it.

In other words, he had forced her into the ballerina pose—a one-legged standing side-fuck position.

And the moment that pose was established,

Creak...!

A phone camera peeked out from under the partition.

'I want to keep this... this other side of brother-in-law I never knew...'

Dopamine surging from discovering Tae-yang's dual nature,

Seo Da-hye, her fear completely overridden, began recording.

"Nghahhh...! This position is too m-much..."

"I know... Mi-na, this is the pose that embarrasses you the most. That's exactly why I want to savor this moment even more. Consider it compensation for not doing it on Mother's desk."

Secretly timid Seo Mi-na would turn beet red whenever they did wall-fucking or this ballerina pose in the semi-basement.

Because it was downright animalistic.

Especially having her legs lifted, her pussy exposed, and her juices gushing out—it felt like she was pissing herself.

"This is a bathroom. Let those juices flow freely, my beloved Seo Mi-na! Right in front of your future husband!"

Plunge—squelch!! Squelch—slam!!♡ Squelch—slam! Thrust—splurt!!♡

Geum Tae-yang had long been fully aware of it but had kept silent out of consideration for his soon-to-be bride. However, sensing this was the perfect moment to use it as a stimulant, he blurted it out while vigorously thrusting in a one-legged standing side-fuck position. "Tuhhhuuuuuk! Huhhht! Kuhhhuuuuuk!"

"Good! You're letting out such magnificent moans, our ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Mi-na! This is how Seo Mi-na should sound when she fucks me!"

—Plap!♡ Splurch!♡ Plap! Squelch!♡ Plap!!♡

As a result, what erupted from Seo Mi-na's mouth could no longer be called a woman's cries—it was the howl of a beast in heat. Her eyes rolled halfway back,

and Geum Tae-yang couldn't contain his satisfaction as he relentlessly drilled into her in an exquisite ballerina position. "Kyah! Mother-in-law's building facilities are sturdy as hell! Holding up even with all this pounding!"

—Squelch!! Slosh!! Plap!♡ Splurt!♡ Plop! Sploosh!♡

"Tuhhhuuuung! Tuhht! Huhhhuuuk! Huuuuuaaang!"

Thud! Thud! Thud! Geum Tae-yang rammed into her with brutal impact. Wasn't the charm of bathroom wall-fucking the precarious, creaking tension? Kim Seo-yeon, who usually took facility management seriously,

had unwittingly provided her future son-in-law and daughter with an excellent sex playground. "Damn, she's just gushing like crazy!"

"Haaanght! Huhht! Huuuuaaang! Tuhht! Hnghhuuaaah! Hnnguuuh!"

Drip...!♡ Splatter...!♡ Dribble...! Trickle...!♡

'Haaaah... I think my sister's juices are gonna get all over my phone...!'

True to form, Seo Mi-na was squirting her fluids like piss,

and given the position, the force of her ejaculation was like a waterfall cascading down. Her juices splattered everywhere,

leaving her younger sister, Seo Da-hye, burdened with the shocking worry that her sister's fluids might stain her belongings. "Keep squirting... let it all out, our Mi-na... Your soon-to-be husband can take it all..."

Plap...!!♡ Squish...!!♡ Splurt...!!♡ Plop...!! Squelch...!!♡

"Shut uuup... Tuhhng! Huhhhuung! Shut uuuup...! Kuhhng! Huuuuung! Just shut up and fuck me, you adorable bastard! Hnngkhuuuuk! Just keep pounding meeeh! Hnnguuuh...! Tuhht!♡"

Drip...!♡ Trickle...!♡ Splatter...! Sploosh! Trickle...!♡

"Keh heh! So cute... Smooch!♡"

'Just a little more... Right now, I can't quite see... the place where the two of them are tangled together properly...'

Shift...! Shift...! Shift...!

Still, Seo Da-hye's determination to achieve her goal was formidable. As her brother-in-law and sister's act escalated in a way she desperately wanted to capture on her phone,

she mustered her courage and pushed the camera in even more aggressively. But then—

Drip...! Something slid down beside Seo Da-hye's phone. What could have fallen? 'Ah...! T-this is...!'

Her eyes widened in shock as she froze. 'Gyaaah! 12 million won!!'

When Seo Da-hye had taken Geum Tae-yang to buy a suit at Xenia, he had gaped at the price tag of the selected ensemble. Having thought he'd gotten a taste of this world, Geum Tae-yang had assumed it would cost around 5 to 6 million won. But the suit's price—more than double his estimate—left him speechless. "Sis-in-law, isn't this way too expensive?"

"It's fine, brother-in-law. We're basically buying it with the family card anyway."

"R-really?"

Had it been Seo Mi-na with him, he would've accepted it without question—after all, his woman's money was his money soon enough. And given her no-nonsense personality, there was no room for negotiation. But with Seo Da-hye, he thought there might still be room to talk. 'I'm sorry, brother-in-law... That was a lie...'

In truth, Seo Da-hye's claim about the family card was a complete fabrication. 'I wanted to buy your first suit with my own money...'

As a top university student, Seo Da-hye had tutored during every break since her freshman year. Already famous for her academic prowess, she earned a considerable income,

and being frugal by nature, she had saved up a significant amount. She was spending it now—on her precious brother-in-law. "Your boyfriend is really handsome. I'd love to photograph him just like this and feature him as the main model in our catalog."

Given that Kim Seo-yeon and her daughters rarely visited Xenia, a menswear-focused store—except for Kim Seo-yeon's occasional business trips—the staff naturally didn't recognize Seo Da-hye like they might have elsewhere.

But the impression they gave off—

The luxury car parked outside, the effortless way they selected high-end suits without hesitation—sent the Xenia employee's customer service instincts into overdrive. 'Boyfriend...?'

As she adjusted Geum Tae-yang's suit, Seo Da-hye's eyes widened slightly at the employee's mistaken assumption. "Ah, you've misunderstood... He's not my boyfriend... He's my brother-in-law... Soon to marry my eldest sister..."

She smiled awkwardly, correcting the misunderstanding with a sheepish grin.

"Oh! My apologies... It's just that the two of you look so perfect together..."

"Hah! The bride-to-be and my sister-in-law here are practically twins! So in a way, you're half right! No need to apologize so much!"

Tae-yang waved off the employee's bowing apology with a chuckle.

"Let me tie your tie, Brother-in-law."

"Thanks, Sister-in-law!"

After that brief, unexpected moment,

Seo Da-hye carefully selected and tied Tae-yang's tie herself, pouring all her sincerity into the act. 'The sister who will soon be his lover and wife... will do this for him every day, won't she? Even this tie I bought for him...?'

Today, she wanted to give everything she had for her precious brother-in-law. Maybe it was because she believed only then could she pick the perfect outfit for him. Almost like... a girlfriend? But in that fleeting misunderstanding, she was sharply reminded—the man before her belonged to her sister, who shared her blood and face. 'The purple tie I tied for him...'

Still, she was happy. This date, just the two of them,

And the tie, almost like a symbol of it—

Fell beside Seo Da-hye's phone as she filmed Tae-yang and Mi-na mid-passion.

"Your pussy is so good, Mi-na! Woah! Your tight little cunt fits my cock perfectly!"

Schlick!Squelch!Thrust! ♡ Squelch!Pound! Pound! ♡ Plunge! ♡

"T-Take it! Hahh!Ngh! D-Deeper! Hnngh!"

'Brother-in-law... is making love to my sister... wearing the suit I bought him...'

The unexpected composition surged into Seo Da-hye's mind like an incoming tide, flooding her thoughts.

Though his shirt was off, Geum Tae-yang hadn't completely removed his pants—they were still on, just pulled down to his calves.

Technically speaking, he was still wearing the suit trousers she had bought for him.

In other words, Geum Tae-yang was fucking Seo Mi-na while still dressed in the clothes she had given him.