The Obsessed Sister's Bedroom Trap
"Oppa... what... are you... doing...?"
A sticky voice clung to the back of my head before plopping off with a wet thud.
I whipped around. Two red eyes floated in the air like they were hovering there all alone.
My heart rate spiked to maximum in an instant.
Why didn't I hear her? The front door should've made a huge noise.
That's when I noticed the soundproofing foam lining the inside of her bedroom door.
Come to think of it, I hadn't turned around once since stepping into this room.
And just in case, I'd shut the door behind me.
Damn it.
Thud... thud...
"Oppa... what're you doing... in your little sister's room? Why'd you come in here?"
Creak.
Creeeak.
Something inside her was straining to break free.
Like a monster submerged in the sewer sludge, suddenly rearing up.
A soul coated in loathsome, grotesque, ominous, wicked slime.
I had to stop it.
An intense terror gripped my heart—the genuine certainty that she'd kill me for real.
"Ah, J-Jia, you know how it is!"
"How do you know my name...? I haven't told you yet this time...?"
Thud.
Thud.
She took a step forward; I retreated one.
Thump—
My butt hit the desk behind me.
No more room to back up.
"W-well, see, I saw your diary. And anyway, it doesn't make sense for a real big brother not to know his little sister's name, right?"
"...Yeah... okay, I'll let that slide... But why are you here? Why'd you barge into my room without asking...?"
Grind.
Crunch.
Whether she couldn't control it or was just holding back her rage, the grinding of Kang Jia's molars pierced my eardrums.
I had to find it.
Some excuse to get out of here.
Think.
My little sister—no, Kang Jia—had affection for me.
Violent affection I didn't want, but the way she stuck to me thinking I was her real big brother made that clear.
Just look at all those photos on the wall.
From what I'd seen with my own eyes, she'd been stalking me since I was 17—seven whole years. No normal twisted love could sustain that.
I had no idea why she was pretending I was her blood brother and acting like her little sister, but whatever. It was something I could use.
As I leaned rigid against the desk, frozen stiff, she closed in right up to me.
"You know... oppa... you know I really love you, right...?"
"Y-yeah, I know."
Her red eyes burned in the darkness like a cat's—fiercely predatory.
A gaze so horrifying it drilled straight into my pupils.
"Then tell me. Why haven't you been answering me? Tell me."
Zing!
"!"
Her voice burrowed into my skull, churning everything up. Like a grotesque parasite extending tentacles between every brain fold, the voice of my cute, pretty, lovable little sister who loved her oppa more than anything soothed me.
My sister—the one with that repulsive voice invading my mind—seemed like the most adorable thing in the world.
"Tell me, tell me, tell me, tell me, tell me!"
Zing! Zing!!
How could she be so cute?
Even her tantrum was lovable.
"Guhhhh—"
No.
No, I don't think that. I never thought that.
It was like wires were connecting in my head, hijacking my thoughts.
I had to hurry.
Answer even a second sooner.
My sense of self was crumbling.
I'd shatter completely.
If I kept taking that voice, that gaze... I'd break beyond repair.
What should I say?
If I gave in to that weird suggestion, my mouth would blurt out the "honest" truth: that a creepy bitch like her wasn't my real little sister.
That'd be the end.
No suggestion, no command, no begging needed—she'd straight-up murder me. The premonition hit hard.
What answer? One she wanted to hear, but that'd get me out of this. One that protected my ego while satisfying her tastes.
Drip—
Her cool hands cupped my face as she drew closer, her forehead touching mine.
One more command to speak, and... it was over.
I finally opened my mouth.
"I-I was lonely!"
"...Huh?"
"Y-yeah, I came in 'cause I was lonely. Oppa was lonely and missed his little sister, but you said you were going to work and left, so... y'know..."
I glanced at her face—it softened dramatically. Still a hint of suspicion, but this was the right answer.
One that confirmed our "relationship."
But the test wasn't over.
"Really...? Hehe... so cute. Hee... But y'know... I get that, but why are all my precious treasures just sitting there wide open...?"
The mad glint had been suppressed for now, but it still swirled in those eyes.
How to play this?
Kang Jia was obsessed with her "real big brother"—me. Intensely, sexually obsessed.
She got off on twisted, taboo pseudo-incest play, craving to feel that special bond physically.
If I wanted to keep up the act, I'd need to match her perversions.
Shared traits were key to winning human goodwill.
"Uh, that... it's kinda hard to say."
I deliberately stalled.
"Pfft. Don't bullshit me—spit it out. I'm gonna get mad, oppa."
Now.
"S-so... I wanted to smell you... l-like, maybe sniff your worn panties or something..."
The most perverted excuse I could muster: panty thief.
Her eyes bulged wide at my words.
The sharp edge dulled, fracturing.
From emotionless monster face back to her lovable little sister expression.
The sister so smitten with her big bro she didn't know what to do with herself, drowning in forbidden love.
And the moment she confirmed her feelings matched her oppa's—
The churning madness ebbed away fast, replaced by slimy lust rearing up like a serpent.
"A-ahh... ugh... r-really...?"
"Y-yeah... sorry."
Tremble tremble tremble!♡
"Hngh...♡ Hah!♡ Hyuk...♡ Eek...!♡"
Why... was she like this?
Her thighs quivered like she was seizing.
Her bowlegs spread lewdly to the sides.
No way... was she climaxing right now?
Just from hearing I came for her panties? No touching, and she was cumming from her pussy?
Twitch!♡
Twitch♡ Twitch♡
"Hah... haaah... hah..."
After the wave passed, she approached with a different kind of creepy gleam in her eyes.
"I... brushed my teeth. Let's kiss♡"
So the work and school were all lies.
Mwah♡
Smack♡ Mmmwah♡ Smack smack smack♡
Unable to contain her love for oppa, she crashed her lips into mine over and over.
A nice minty freshness hit me.
Wherever she'd gone to brush, it wasn't work—so she probably didn't even have a job.
Which meant my free time was limited.
Now I got why that last memo on my smartphone in my pocket had been scribbled in such a panic.
Ten minutes tops from vanishing somewhere to brush her teeth and return home.
That was my only window to uncover the truth about this situation.
"Haa... I love you so much, oppa. What do I do...? I-I want it..."
"What?"
"That... I want that..."
This was bad.
Sex once wouldn't be a big deal, but if that one time warped our fragile fake-sibling bond into something else... who knew how she'd react.
And above all, I didn't want to fuck a monster like her. Cute looks, lovable gestures aside.
I'd just seen it.
What lurked beneath her little-sister skin.
If we became lovers and her obsession intensified, even those ten minutes of freedom might vanish.
Worst case, like some old horror flick, she'd chop off my limbs and carry me around like a meat onahole on her back.
"Huh? What do you think, oppa...? Should we... do it? Let's do it... yeah?"
With her arms wrapped tight around me, rubbing her head against me like a cat marking territory, her signature lavender scent invaded, numbing my brain.
Before it paralyzed me completely, time to calmly persuade her.
"Jia."
I grabbed her shoulders and met her eyes.
She seemed to like eye contact.
"N-ngh... wh-what...?"
"You and I are brother and sister, right? The closest family in the whole world—no one closer."
"Ngh... yeah..."
"Of course I love you too, but we can't. Crossing that line means we're not brother and sister anymore. I want you to be my 'little sister' forever."
Her eyes darted wildly, unsure where to look.
This answer was tailored perfectly to her desires.
Destroying the sibling bond herself for a quick fuck would contradict everything she'd done so far.
If it was just about sex, why hadn't she raped me yet—making me her fake blood brother?
When I slept, when I woke up, when she used that weird suggestion.
I couldn't defy her then.
Fucking me in that state would've been easy as pie.
But from what she'd said, she'd never done it.
Meaning she feared wrecking the brother-sister dynamic too.
"Ugh... y-you're right... sorry, oppa..."
Sulky.
She hung her head, sniffling.
"It's okay."
Pat pat.
I stroked her hair.
Like I'd done it forever.
'Dodged a bullet.'
I'd somehow made it through.
As I let out a sigh of relief, she lifted her head again.
"Oppa, I'm tired. Let's sleep together."
"I'm not sleepy—"
"Sleep! Do this much for me!"
She'd been persuaded, but missing out on sex left her pouty and bratty. Her lips pursed, that petulant demand carried a strange binding force.
"Fine... let's go to oppas room and sleep. Got it?"
"Yay! Hehehe, I love oppa so much!"
At least her suggestion wasn't that strong.
Just sleeping together? That could happen between siblings, I guess.
Not hiding the smartphone bugged me a bit, but I'd stash it later—excuse myself to the bathroom or something.
Pry open the vent in the bathroom ceiling and hide it there.
Whew...
Mentally drained, I shuffled out of her room on unsteady feet when a flat voice drifted after me.
"But y'know."
"Huh...?"
"What's that thing you hid... in your pocket, oppa?"