The Sisters' Group Sex

And so another day passed.

Fortunately, the chastity belt So-hee had locked onto Juhwan came pierced with small holes around the urethra and along the sides of the shaft, so it caused no real trouble when he urinated, and thanks to the way water could drain through those side openings, he could manage a rough rinse as well. Of course, he couldn't lather soap directly onto his cock—splashing a few drops of water over the steel was about all he could manage...

Juhwan wore the belt all the way to school, and then to his evening shift at the store.

Then Ji-hee texted him, and the two of them met up for dinner. The moment he saw her, last time's cosplay flashed through his mind, and when her deep, unfiltered cleavage came into view, his cock began to stiffen—

Only for the swelling shaft to jam hard against the chastity belt, leaving nothing behind but pain. Not a single one of those urges could be relieved.

Ji-hee noticed his discomfort and asked what was wrong, but naturally, there was no way he could tell her the truth.

Ji-hee: "Oppa... what's the matter? Are you feeling sick somewhere?"

Juhwan: "Ah, yeah... it's nothing, haha. I think... I might have an upset stomach, that's all..."

Completely unaware, Ji-hee ended up dragging him to a pharmacy after dinner and, without making a scene of it, bought him stomach medicine. Out of options, Juhwan simply accepted it.

After that day, no more texts came from So-hee.

Evidently, this time she was properly pissed.

"Noona, can't you cool off and just unlock this thing for me now?"

"I'm sorry if I upset you, noona. I'll apologize, okay?"

"Wearing this thing is killing me... please stop being mad and take it off, alright...?"

Finally pushed past his limit, Juhwan texted So-hee first—but the result was left on read.

No matter how much he begged over text, So-hee coldly shut him out, laughing at him from behind her phone screen.

A week passed like that. Then two.

So-hee's husband, Geon-young, left on yet another overseas business trip.

Two weeks of forced abstinence, and Juhwan was slowly crumbling.

Whether he looked at Ji-hee at school or passed some girl with an insane body on the street, there was absolutely no way to relieve this overflowing lust.

So-hee wouldn't pick up his calls, wouldn't answer his texts, and going to see her in person felt impossible—her younger sister So-jin was staying at So-hee's place right now, and that alone worried him.

All he could do was revert to his old timid self, Park Juhwan, pacing in circles alone until So-hee came back to unlock the belt herself.

It was the evening of the second week since So-hee had locked the belt onto Juhwan's cock.

With Geon-young out of the country again, the sisters So-hee and So-jin headed straight for a club together.

The sisters drank side by side at the club, their eyes busily scanning the men around them.

So-jin: "Unnie, you still haven't dropped that slut nature of yours~ Your husband leaves on a business trip and you go straight to a club lmao"

So-hee: "Shut up, you fucking bitch. You came along because you wanted to—I don't think you're in any position to talk, lol"

When the two sisters hit the club, the men flocked around them, fawning like beasts starved for a taste they couldn't have, while the sisters coolly sized up the pack, picking out the men they liked best.

So-jin: "Oh right, lol. Unnie, by the way—you've got something going on with that guy from downstairs, don't you?"

So-hee: "What?! The fuck, no!! Why are you suddenly bringing up that bastard?!"

So-jin: "Unnie, lmao, you think I'm an idiot? When that guy came to our door with a package, I read the whole vibe between you two."

So-jin: "And then you used taking out the trash as an excuse, slipped out after him, and didn't come back for ages, did you?"

So-jin: "Be honest, lol. Did something happen with him? Is he really that good?"

So-hee: "Shut your mouth, you fucking bitch... just go pick yourself a man already."

So-jin: "Lmaooo not gonna tell me~? Whatever, lol. I'll just keep asking later until you answer lmao"

So-hee: "......"

So-hee, too, couldn't stop thinking about Juhwan—locked up in the belt and left to stew for two full weeks.

She'd brushed off his pleading texts on the surface, but deep down, they'd gnawed at her.

Still, she decided not to think about it tonight.

Exactly one hour later, So-hee and So-jin had each chosen a man they liked at the club.

So-hee kissed hers; So-jin ground her ass against her man's crotch, and went further still, letting him grab her breasts.

So-hee: "Chuuup... chuuup... mmmah..."

Caring nothing for who was watching, So-hee kissed the man in front of her without holding back.

So-jin snickered at the sight.

So-jin: "Lol, you shameless slut... lmao. Married and still exactly the same."

The sisters kept driving their men wild ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠with want until, unable to endure it any longer, the men were steered into taking them out of the club.

So-hee's man: "Haah... haah... I can't take this anymore, haha. Babe... shall we get out of here?"

So-hee: "Lol, get out of here? I'm not the type to be satisfied easily, you know~"

So-hee grabbed his cock, hard.

So-hee: "Think you can satisfy me?"

So-hee: "If you're confident, follow me~ I'll take you home and fuck you stupid—squeeze every last drop out of your balls until there's not a trace left, lol"

So-hee's man looked her over and let out a low whistle—wordless agreement.

So-hee's man: "Lol, then let's find out whose balls empty first—or whose pussy ends up wrecked, huh?"

So-hee: "Lmao love the confidence. Follow me, then."

So-hee took the man's hand and made for the exit.

On her way out, she searched for So-jin.

So-jin was already deep into it with her own man, well past the stage of making out and grinding.

So-hee slapped her on the back—whap!—and So-jin whirled around, startled.

So-jin: "Agh, fuck! What the hell?! You scared me!"

So-hee grinned at So-jin and her partner in turn.

So-hee: "Hey~ bring your boy and come on. We're going home."

At the word home, So-jin's eyes went wide.

So-jin: "What? Home?!?! So this time we're doing a full-on group session?? On my brother-in-law's bed??"

But So-hee was already tugging her partner by the hand, vanishing into the distance.

So-jin: "...Fuck..... I'm so turned on rn."

So-jin's man: "Uh... what does that mean...? And who was that? She looks so much like you??"

So-jin stared at her partner for a long moment.

So-jin: "Oppa, you've never had a threesome before, right?"

So-jin: "Come on, then. Tonight's your lucky night, hehe."

So-jin, too, grabbed her partner's hand and slowly began to disappear in the direction So-hee had gone.

*An hour later, at Juhwan's place*

Juhwan: "...Still couldn't get this thing off today, either... fuck."

A sigh was all he could manage.

There were holes small enough for water to seep through, supposedly...

Relieving his lust was one thing, but hygienically, it was a disaster.

Life in the chastity belt never got any easier to accept.

He'd fall asleep at night, and every morning the swelling woke him first—pain dragging him out of sleep before anything else...

And when he reached down to touch himself, the strange cold feel of steel where warm flesh should have been made life itself feel somehow alien.

He shoved the dark thoughts aside and decided to at least go wash up.

He stepped into the bathroom and showered.

He could no longer remember the last time he'd lathered soap directly onto his own cock.

Little by little, like this, he found himself clinging to So-hee—until he'd even begun to feel like her slave.

When Juhwan came out of the shower, for the first time since that first day with So-hee, the noise from the upstairs apartment was sounding again.

Juhwan: "...Huh...??"

This time, the sounds were rawer and more intense than ever before.

And this time it wasn't just So-hee's moans—another woman's voice moaned along with hers.

Geon-young was out of the country again, and So-hee had dragged another stranger into her home. Learning this, Juhwan clenched his fist and began to tremble.

Juhwan: "That... that fucking bitch... she locks this hell onto me... and then brings another man home to fuck right above my head...??"

*So-hee's bedroom, that same moment*

So-hee ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠and her man lay tangled together on the bed, going at it cowgirl style.

While So-hee rode him, So-jin held up her phone camera, filming the whole thing.

So-jin: "Oppa, oppa!! That spot down there!! My unnie hasn't had that part used yet today, hehe lol—do that part too!!"

So-jin: "Wow... the video quality is insane? How much do you think I'd get if I sold this? lmaooo"

So-hee: "Haah... haah... aaahhng... lol shut the fuck up... the second you sell... aahng... that thing, I swear... you're dead..."

So-hee's man: "Hah... hah... fuck, this pussy's unbelievable... lol. But are you two really sisters? Two sisters who are both this much of a slut??"

Behind So-jin as she filmed, the man she'd brought along grabbed her breasts, hard.

So-jin's man: "Quit filming, lol. Time we got started ourselves, no?"

‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠

So-jin: "Aigoo~ lmao, someone's impatient."

So-jin flopped down beside So-hee mid-ride and spread her legs wide open.

So-jin: "Come on in~ lmao"

So-jin's man: "Lmao ha... you nasty slut... dig in? I will, lol"

The man's cock pushed into So-jin's pussy and probed at her womb, and the bed rocked violently under the bodies of two shameless couples.

So-jin: "Ahhng~~ so deep, fuck~~ more! fuck me harder!!"

So-hee: "Aahhng... not losing to you, lol. More! MORE!!"

Competition sparked between the two sisters.

Who could make her man cum first.

So-hee's man: "Hey, lol, what are ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠you two doing??"

So-jin's man: "Ngh... it suddenly got way tighter in here, though? lmao. Whoever makes him cum first wins?"

So-hee: "Haaaaahnng... lol shut up... hurry up and cum, fuck, lmao"

Like some animal kingdom, the four of them kept up their rough group session.

This time the men lay side by side on the bed, So-hee and So-jin seated their pussies down onto their partners' cocks, and the two women began bouncing their hips without restraint, racing each other.

So-hee: "AAAHH!! Yes, fuck!! my pussy!!! are you insane?!"

So-jin: "Me too!! Aahng hehe, it's hitting my womb! I think I'm gonna break!!!!!"

So-jin's man: "Hey, you sluts are so damn loud, lmao. What if the neighbors report you for noise someday, huh?"

At that, So-hee froze for a beat.

But then...

So-hee: "...So what, fuck? Why? Scared? lmaooo"

As if daring the man downstairs to listen, she slammed herself down even harder and deliberately let her moans ring out loud.

So-jin: "Ahh! U-unnie!! I'm close, fuck!! any second... haha... lol I'm about to go..!"

So-hee: "Hah... hah... fuck, me too...! Like hell we'd... we're sisters for a reason... aahng... going together, yeah..?"

So-jin: "Aahng..! Don't care, fuck...!! I'm cumminggg!!"

So-hee: "AHH, me too, fuck!!!!!!"

Two whore sisters, getting absolutely wrecked by strangers' cocks on top of the marital bed—while downstairs, Juhwan spent that night unable to sleep, seething with frustration.

*The next afternoon*

Class was over. Free time before his evening shift.

Juhwan was walking home from campus.

His mood had been complete shit all day.

The shitty chastity belt was still locked on his cock, and So-hee still wasn't replying.

On top of that, So-hee had once again brought a man to her place and fucked him, bold as brass.

Left to his own thoughts, he even wanted to march over there and kill someone on the spot.

Juhwan arrived at his building.

The elevator doors opened, and the moment he stepped out, a stale smell of cigarettes stabbed at his nose.

He pinched his nose, his face twisting—and then his gaze slid toward the stairwell beside the entrance, and the moment he spotted someone sitting there, Juhwan froze on the spot.

On the stairs sat So-jin.

True to her sister, that absolute mongrel, she was crouched on the officetel corridor stairs—a no-smoking zone—puffing away without a care in the world.

So-jin saw Juhwan step off the elevator and smirked.

Juhwan tried to ignore her and head for his door, but...

So-jin: "Hey."

She called out to him. In casual speech, no less—the kind you use to talk down to someone.

Irritation began to creep up Juhwan's spine.

Thanks to the belt that So-hee bitch had locked on him, his condition was already at rock bottom.

And now the sister of the woman who'd locked it on was talking down to him out of nowhere.

Juhwan: "...We've met once, and you're already using casual speech... you really know how to ruin someone's day, fuck..."

So-jin: "LMAOOO god, you suck at cursing, you pathetic bastard."

Juhwan: "What did you say?"

Flaring up, Juhwan moved—from the direction of his door, toward So-jin.

Juhwan: "Say that again. No—what's with the attitude in the first place?"

So-jin: "Pfft, lol. Attitude? All I did was call you over."

So-jin went on.

So-jin: "I heard from my unnie—you're 23, right? Same age as me, lol."

So-jin: "Our stick-in-the-mud old-school parents had my unnie first, then wanted a son and had me way later, see lol"

So what? What was her point?

Juhwan couldn't have cared less about this girl's family history.

He shot So-jin a sharp glare—and she caught it instantly.

So-jin: "Ooh~ nice glare, lmao. The eyes of a horny male animal who's been denied for over two weeks, lol"

Juhwan: "?!?!?!?!"

The chastity belt? How did she know?

Did these goddamn sisters really share even this kind of thing with each other??

So-jin: "LMAOOO you dummy, lol. What? Wondering how I knew?"

So-jin: "That's my unnie's patented specialty~~ what she does when a male animal won't behave, lol."

So-jin: "Sooner or later, those male animals come crawling back on their own, get down on their knees, and beg? Please unlock me, please... pfft... lmao"

Juhwan: "......"

So-jin reached into her pocket, pulled something out, and held it up for the silent, staring Juhwan to see.

A key. The key that would unlock the chastity belt clamped around Juhwan's cock.

So-jin pointed toward Juhwan's crotch with the hand holding her cigarette.

So-jin: "That thing... want me to unlock it? Or not? lol"

Despite wearing a skirt, she sat with her legs spread wide open—her panties already on full display...

And while spinning the key in her right hand round and round, So-jin looked down at Juhwan with an unreadable smile.

So-jin: "In exchange, there's a condition... want to hear it? lol"