Voyeur's Forbidden Thrill
If something like that went inside me...
Shin Soye was being extra clingy today, more than usual.
"Nngh...!"
Her tone pitched higher in a strange way, and the hand that pretended to push my head away. Every time my tongue swirled inside her pussy, she'd tense her thighs and grab my head. It felt like she was deliberately throwing a little tantrum at me.
"Sis, loosen up a bit."
I said it while sucking on her pussy, but she ignored me completely. She just kept squeezing, subtly pressuring me. She'd gotten jealous about me hanging out with Im Haeun and was sulking a little, it seemed. Even if I told her it wasn't like that, if she was pouting anyway, I'd have to make it crystal clear.
So I stopped the teasing and lifted my head.
"Nngh... why'd you stop...?"
Without a word, I pulled out my cock and thrust it straight into her. No consideration, right to the hilt.
"Ha-ut!"
She was already soaked, so her pussy swallowed my cock whole. Shin Soye bucked her hips from the sudden pleasure, but I grabbed her breasts hard and started pistoning away.
"S-Sejin, you... you're bigger... somehow..."
"Yeah."
To keep her from saying more, I shoved my cock all the way in and pulled out fast, repeating it over and over. Rougher and harsher than usual, focused only on slamming my huge dick from tip to base.
"You're... too... ahng!"
Shin Soye couldn't speak properly anymore, lost in the pleasure of her pussy being completely filled by my massive cock.
Phone in hand, Im Haeun watched the scene with wide eyes.
No way.
She'd guessed they were having sex, but seeing it live was a massive shock. And her sister's face—usually so kind and distant with guys—was utterly alien like this, impaled on Lee Sejin's cock and moaning like crazy.
She's lost it, totally lost it...
Shin Soye's face was pure ecstasy as Lee Sejin pounded her roughly. "Ahng, ah-ang! Aaang!" And her moans were so loud they could wake the neighbors. She'd always held back outside, so the rebound made them even bigger, but Im Haeun didn't know that. To her, it all looked like raw, unfiltered pleasure.
For real...
Her own pussy started itching. Without thinking, Im Haeun slipped her free hand down to it. Her panties were already soaked there, and just brushing her fingers over it sent a jolt through her.
"Hngh...!"
She barely stifled the moan. Only then did she realize she was trying to masturbate and panicked. But she didn't stop. The massive pleasure she'd never felt before kept her hand moving.
"Open your mouth."
That's when Lee Sejin yanked his cock out roughly and hauled Shin Soye's upper body up. He stood and grabbed her head, shoving his dick in like she was a fleshlight.
He's insane... treating her that rough, sis is gonna...
Im Haeun's heart pounded at the sight. The wild way he handled her sister was primal. What would it feel like to be treated that roughly?
Sis... that face, what the hell...
And Shin Soye, taking it all, looked more blissful and happy than pained.
Does it feel that good...?
That intense? Nothing like solo play. The thought crept in unbidden.
Whoa...
When Lee Sejin pulled out of her pussy, his massive cock sprang up stiffly into view. Huge, throbbing, slick and shiny with their juices. Staring at it, Im Haeun imagined it.
If something like that went inside me...
Just picturing it scared her. Scary, but that fear made her fingers move on their own. Brushing over her panties wasn't enough anymore. She slipped her hand inside and touched her pussy directly.
"Nngh...!"
An even bigger wave of pleasure crashed over her. A moan slipped out unwittingly, but thankfully, the two inside didn't notice.
"Mmph, mmph, mmmph...!"
Shin Soye struggled with the huge cock in her mouth but sucked it eagerly anyway. Too big to deepthroat fully, yet she lavished it with care, like it was delicious.
"Ngh, gonna cum."
Lee Sejin yanked it out roughly and came all over her face.
Splurt!
Semen erupted from his cock in thick ropes. It coated her hair, face—everything. So forceful it splattered past her head onto the wall and bed. The room filled with the musky scent of night-blooming flowers.
"Haa, haa..."
Shin Soye looked feral with lust. From the moment he started cumming, she'd opened wide, tongue out, catching it all. She scooped the dripping semen from her face and licked it off her fingers. Then, begging for more, she started sucking his freshly spent cock again.
So lewd, so fucking lewd...!
To Im Haeun, it was pure eroticism. The cock erupting wildly, semen splattering everywhere, Shin Soye devouring it like candy... Plus the room reeking of cum, sweat, and their ragged breaths.
Squelch, squelch...
Unable to hold back, Im Haeun shoved her fingers inside her own pussy. Already drenched, it slurped them right in.
"Aing, suddenly so rough..."
"You liked it too, right Sis?"
"...Yeah."
"Let's go rough tonight."
With that, Lee Sejin pulled her up and shoved her against the wall. Hands on the wall, she stuck her ass out toward him, perfectly aligned with his cock—like she was begging for it.
But he didn't thrust in right away.
"Uung... Sejin, don't tease..."
He ignored her, rubbing his rock-hard cock slowly against her pussy entrance. He teased her folds and clit with the head, pretending to insert before sliding it up her ass crack instead.
"Ha-ut..."
She shivered at the sensation, playfully coquettish as she savored his cock gliding over her ass and pussy.
Slide, slide.
Like he was showing off to Im Haeun, his cock gliding over her ass crack. Watching it rub her sister's ass, Im Haeun fingered herself faster.
Squelch-squelch-squelch...!
When he teased her entrance with his glans, she rubbed her own. When he spread her lips but didn't enter, pulling back to torment her, Im Haeun spread hers with her fingers but held back. When it slid her crack, she fondled her own ass crack too.
Every sensation drove her mad with need.
"Ha-ng! It's in... ah-ang...!"
After an eternity of teasing, his cock finally plunged deep into Shin Soye's pussy. At the same moment, Im Haeun shoved her fingers inside herself.
"Huuut...! Ahng, ah-ang! Haaang!"
Lee Sejin slammed to the hilt then fucked her like a beast, drawing animalistic moans from her. Im Haeun fingered herself furiously in sync, but...
Not enough.
She knew it instinctively. Her fingers were small and slender. Nails kept her from going deep. Nothing like his massive cock. That thing would fill her to the end, soft yet rough, churning her insides completely.
Not enough...!
Squelch-squelch-squelch-squelch-squelch!!
Feeling her desperation, she pistoned faster, matching his rhythm, chasing the new pleasure. But the gap gnawed at her—this wasn't enough. Caught between bliss and dissatisfaction, she just fucked her pussy as hard as she could.
Her juices leaked out, soaking the floor uselessly.
"Haa-ng...!"
A moan escaped her unwittingly. She startled at her own sound but soon let out soft ones. The two inside were louder; they wouldn't hear. Reassuring herself it was fine, she chased her pleasure.
Squelch-squelch-squelch-squelch...!
Slap, slap, slap, slap...!
"Ah-ang! Haa-ng! Ah-ng! Ang! Sl-slow... ah-ang! Ha-ng! Ungh, hang! Ah-ang!"
Shin Soye's cries filled the room amid the ass-slapping. Watching, Im Haeun hit her peak.
"Huuuuh...!"
A small moan as she squirted. Her juices soaked her panties, dripping to the floor. They were piss-wet now.
That's when it happened.
"Hm?"
Lee Sejin stopped thrusting and glanced at the door.
"Ah-ng... don't tease... ha-ng... keep fucking me. Hurry, keep going."
"One sec."
He pulled out and strode toward the door, cock bobbing stiffly.
So huge. If that went inside...
Mesmerized by it coming her way, Im Haeun kept filming unconsciously, but...
What am I doing!
Snapping to before he got close, she dashed into the nearby bathroom.
"........."
Lee Sejin opened the door and peered out, scanning the floor and surroundings. But Shin Soye's needy calls pulled him right back in. Soon, their fucking sounds filled the house again.
No, no, no.
Im Haeun suppressed her urge to watch more and slipped quietly outside. Still in her soaked panties, pussy dripping.
Once the rough play ended, Shin Soye passed out hard. She'd seemed jealous of Im Haeun subtly, but satisfying her body must've eased her mind. I tidied the room quick and headed to the company.
Today, after picking up Im Haeun and Park Minji, I'd be done. Get them home, then I could rest.
But the practice room was empty when I arrived.
"Where'd they go?"
Normally, both would be sitting there post-training, waiting for me.
"Lee Sejin."
"Whoa, you scared me."
I turned at the sudden voice. Im Haeun leaned against the wall, staring at me. Her face flushed like she was pissed, but in a weird way.