Bound Before Little Sister
Kim Hee-na tensed up in front of her little sister.
'The rope's tighter than I thought.'
The knotted rope harshly yanked her pussy upward. Every movement squeezed her clit to the limit with the knot. And inside her pussy—four eggs.
'I shouldn't feel it from something like this... ugh...'
The situation felt utterly unreal. She, who had always rejected men and buried herself in studies, reduced to this. She'd constantly warned Hee-da to be wary of guys. Never once imagining she'd end up like this before her sister—pussy stuffed full of eggs, nipples stiff and poking through.
"Perfect timing, since we're in the same liberal arts group... we came together, Hee-da."
She spoke first, before her sister could ask. No way could she let on that she was Han Soin's slave. She'd always shown Hee-da nothing but the image of a diligent student.
"Sis... you're taking the same elective?"
Even as she scrambled for excuses, the cord cinching her pussy sparked waves of pleasure.
"We were just working on a group assignment."
Hee-da glanced at her sister's fully erect nipples, visibly outlined.
'No bra, sis.'
The thin coat wrapped around her body did nothing to hide her breast shape or those blatant nipple prints. Hee-da decided to ignore it.
"Hee-da... you talk to Soin, huh?"
Hee-na was too busy covering for herself.
"Yeah, just 'cause he helped me out last time. We're not that close."
Of course, she didn't get chummy with guys—especially not Han Soin. It was an unspoken rule.
Hee-na nodded faintly at her sister's excuse.
"Ah... I see."
There's no way my beautiful little sister has anything to do with Master.
"Yeah, nothing much between us..."
Hee-da forced the excuse out. Sure, she'd kissed Han Soin, sucked his cock and even rimmed his ass—but no way was she admitting that to her sister.
"Hang on, new menu item. I'll whip it up—wait a sec."
"Sure thing, Hee-da."
"Wait a bit, Soin."
Hee-da deliberately spoke to Han Soin in a frosty tone as she prepped the ingredients.
'Sis won't notice, right?'
She cracked open the freshest milk from the fridge and pulled out the spotless blender.
While she worked, Soin teased Hee-na.
"How should our group handle the presentation?"
He brought up a nonexistent group project, yanking the rope behind her seated back.
"Hngh!"
The rope pulled over 10cm taut. It ran from her pussy to her breasts, cinching both tighter with every tug.
Squeeze.
Bound and tormented right in front of her sister. She nearly moaned out loud.
'Haah...'
Her pussy lifted obscenely high, squeezed merciless. Perverted pleasure stabbed deep into her brain.
'S-stop...'
Her already erect nipples strained even harder, on the verge of bursting.
Soin tugged the rope further—then released.
Instantly, a sharp breath burst from Hee-na's lips.
"Hoo...!"
"Sis?"
Hee-da turned from her mixing to look at Hee-na. Her once-proud sister.
"J-just a bit hot in here..."
Hee-na fanned herself, cheeks flushed.
"Want me to turn on the AC?"
"No, it's fine... I ran over here earlier. Don't worry, just make it."
"Okay, sis. Let me know if you get hotter."
Hee-da turned back. Out of her sight, Soin started kneading Hee-na's ass.
The alluring softness of Hee-na's cheeks.
'Hngh...'
Anyone else, and she'd have slapped their hand away—but this was her master kneading her. Right in front of her sister. Hee-na had no choice but to endure.
A helpless sense of restraint.
'This feeling...'
Her restraint tendency spiked. This thrill ruined her for anything else. The intense pleasure from her body bound tight, her mind going limp.
'Feels too good.'
The sensation of one cord binding pussy and tits alike, unable to refuse her master's touch—it amplified her arousal. The taut cord clashed with the eggs inside, grinding her sensitive spots relentlessly.
'Ah... no...'
Ass groped, pussy teased right before Hee-da.
Drip.
'Cumming from this...'
In the end, Hee-na lewdly leaked pussy juice. The rope knot soaked it up, swelling even harder.
Her heart raced. Arousal. Tension of maybe getting caught by her sister. And above all—
'Being bound outside... the thrill is too much...'
Hee-na decided she'd head straight home today. She felt like a total pervert in front of her sister.
Powerless as her master groped her ass, unable to resist, praying Hee-da wouldn't turn around. Soin pulled his hand away—and flipped the switch on one of the four eggs.
Bzzz.
She wanted to look like a good big sister in front of Hee-da. Gritting through the vibrating bliss in her pussy, she forced a blank expression.
"This one's got lots of fruit, so it takes a bit to make."
As she tidied the empty milk carton, she glanced at her sister and Soin. Something felt off.
'Sis looks extra pretty today...'
She said they were nothing, but Hee-na sitting next to Han Soin irked her. Any other girl, maybe fine—but her sister?
'Don't overthink it.'
Just groupmates, she repeated to herself.
'Why am I like this?'
She couldn't focus on mixing. Blaming it on all the guys hitting on her today.
Two glasses ready.
'Extra lemon in Soin's...'
The sister she'd always admired got less; she squeezed extra into Han Soin's.
"All done."
"Looks delicious."
"Your skills have improved a ton, Hee-da."
Something about her sister's voice trembled slightly. Probably disliked her talking to Han Soin.
'Does sis wish I wouldn't hang with guys like him?'
Hee-na's expression seemed oddly subdued.
Hee-da had no clue her sister was fighting off the egg vibrations ravaging her pussy.
"Hee-da doesn't do this kinda thing for guys."
"Is that so?"
"Lucky you, Soin."
They sipped from the pretty glasses.
Gulp. Gulp.
"Tastes great."
"Delicious, Hee-da."
"Really?"
Han Soin's praise lifted Hee-da's mood. At least in cooking, she wanted to outshine her sister.
'Sis... doesn't go anywhere else, right?'
Her own sister, but too damn pretty.
Hee-na quickly pocketed her phone.
'Got an appointment?'
Unlike Hee-da, who worried they'd be alone, Hee-na set it down.
"Gotta hit the bathroom real quick."
Not an appointment—a bathroom break.
"Don't say weird stuff to Hee-da while I'm gone."
"Of course, Hee-na."
Quiet evening hours, no one around. Hee-na rose slowly.
If her coat slipped, her sister would see the turtle-shell bondage—pure pervert gear.
'Too... tight...'
Every motion cinched her pussy and tits tighter, building her arousal.
The rope knot was already soaked in her juices.
She'd stood because of Soin's message.
She never dreamed she'd obey her master's command even in front of her sister.
'Snap quick and get somewhere without Hee-da.'
The full-body restraint kept her enslaved, perhaps.
No way could she show that to her sister.
'Too tight...'
She could just quit this nonsense—but the vibrating eggs and cinching cord ignited pleasure.
B-wing bathroom. Her chosen spot.
'Anyone here this late?'
Another stall occupied.
'She'll leave soon.'
Someone else nearby ramped up her tension. She hung her coat, revealing her rope-bound pervert body.
Foreign porn-level bondage squeezing pussy and tits obscenely.
'Ugh...'
Caught like this by anyone, her college life was over.
'Don't get caught... slow...'
Click.
A selfie snap from the next stall.
'Just a year as a slave...'
Master would check his phone in front of Hee-da. Imagining her sister seeing it tensed her more.
(Depends how sincerely you take them, Hee-na.)
Even doubts if she should do this swirled in her head.
'That woman in the end stall... not leaving.'
She pondered sincere shots for her master. For the man she'd share with Hee-da.
To keep him from showing—more pervy pics.
Sweet and fresh—Hee-da's new menu.
"Hee-da, this drink's delicious."
"I worked hard on it."
"You said you'd open a cafe someday. Got the skills."
"You bet."
Evening lull, no passersby. Cafe should've been closed.
Soin was relieved Hee-na hadn't resisted much.
'Restraint level 4, huh. Holding up for now.'
Worth the incremental level-ups.
"Wanna earn startup cash here too, Hee-da?"
Like her sister, he planned to raise Hee-da's level if possible.
"Sis... is here?"
"Triple pay."
With Hee-na in the bathroom, Soin made his pitch.