Saturday Afternoon at 2 PM
It was Saturday afternoon, exactly two o’clock. Sunlight sliced through the curtains and stretched across the living room floor in long, golden bars—a moment so peaceful it felt almost criminal.
I was fused to the sofa, eyes glued to my smartphone. Auto-hunting in a mobile game while mindlessly scrolling the web. The classic weekend scene of a perfectly ordinary Korean college student.
At least on the surface.
In reality, every nerve in my body was stretched toward the door at the far end of the hallway, opposite the living room.
“...”
Silence.
Right now the only people in this house were me and Big Sis.
Dad and my stepmom had left that morning, humming happily about their wedding anniversary and a two-day, one-night getaway. Thanks to them, this big empty house now belonged to just two people: me and the woman who lived behind that door—Park Soyeon.
Big Sis.
A word still too awkward to say out loud, yet far too obscene to linger on in my head. Seven years had passed since Dad remarried her mother, but the two of us were still essentially strangers sharing a roof. Legally family. Siblings on paper. Yet not a single drop of blood in common—perfect, unrelated strangers.
She had no idea how much comfort that fact gave me… or how completely insane it made me.
Creeeeak—
Finally.
The sound of the door swinging open echoed down the hallway like a starting pistol. Showtime. From here on I had to act as casual as humanly possible. I kept my face buried in the game, every ounce of attention funneled to the very edge of my vision.
Shuffle. Shuffle.
The familiar sound of slippers dragging across the floor preceded the silhouette that emerged from the doorway.
Hair clumped into greasy dreadlocks that clearly hadn’t seen shampoo in days. An oversized grey t-shirt so stretched at the collar that her collarbones peeked out. Baggy pajama pants so loose they looked like a collapsed tent around her legs.
The textbook example of a K-hikikomori.
A gloomy, antisocial shut-in who had severed all ties with society.
But that wasn’t what I saw. Those details blurred into the background like unimportant scenery. There was only one thing that seized my entire focus.
Shit… those goddamn H-cups that even that baggy shirt can’t hide.
Could those possibly be natural? They say God is fair, but clearly He stole every last point of intelligence and social ability from Big Sis and dumped it all into her chest.
That ratty, overstretched t-shirt didn’t conceal her sensual figure—it amplified it. Every step sent those heavy breasts swaying, proudly announcing their presence. That sight was the most beautiful proof of gravity’s law I had ever witnessed.
Big Sis hugged the wall, trying to erase her presence as she crept toward the kitchen. The moment her eyes met mine on the sofa, she flinched like a mouse spotting a cat and hunched her shoulders.
“U-um… I-I… w-water… I came to drink some…”
Damn it. Even the stuttering was turning me on. My brain was officially broken beyond repair.
After seven years under the same roof she still got nervous around me. A pure female who existed only inside this house, completely cut off from the outside world. That fact excited me past the point of endurance.
“Yeah.”
I gave the shortest possible reply and pretended to look back at my phone. The words on the screen might as well have been hieroglyphs. Every sound behind me—the water dispenser, the clink of a cup, the tiny gulps of her throat—felt like it was stroking my nerves directly.
I watched her back as she retreated to her room. Especially the subtle sway of her hips with every step. That sight naturally dragged my mind back to the day it all began.
It was a sweltering summer day right when I was starting to catch full-blown middle-school syndrome. Only three months had passed since Dad and my stepmom got remarried. The weekend was painfully awkward. I stayed holed up in my room while the stranger who had invaded our house—Park Soyeon—stayed locked in hers. We treated each other like we didn’t exist.
That day I was gaming as usual. My throat eventually got so dry I dragged myself out to the living room. That was when it happened.
Bang!
The bathroom door flew open with a burst of steam. And there she was… Big Sis, wearing nothing but a towel that looked one breath away from falling off.
The world stopped. Or rather, it slowed to a crawl like a slow-motion scene.
It was the first time her real body—normally hidden under terrible posture and baggy clothes—was revealed. Under the misty bathroom light, that white towel couldn’t possibly cover everything. The dramatic curve of her waist, the full swell of her hips, those long, endless legs. And above all else… those two enormous peaks that strained the towel to its absolute limit.
Water droplets fell from the edge of the towel, plip… plip… onto the floor. Her face flushed crimson the instant our eyes met. In that moment I awakened to the primal instinct called lust.
The realization that she was not “Big Sis” but a woman collided inside my skull. The forbidden thrill that “step-siblings are legally allowed to marry in Korea” tangled with raw sexuality and burned itself into my brain like an indelible brand.
From that day forward, my sexuality broke completely.
My dick had been imprinted to react only to “Big Sis.” Like it had sworn an oath of loyalty. It stayed limp for every other woman, even porn. Yet the mere shadow of Big Sis could turn it into a blazing furnace. I had become exactly that kind of insane pervert.
“Eep!”
A small cry from the hallway yanked me out of the memory.
Thud!
The dull impact made me sit up. When I reached the living room I found Big Sis sprawled embarrassingly on the floor right outside her door. She had apparently tripped over an old, frayed power strip cord.
“Whoa, you okay?”
I asked without thinking and walked over.
And that was when I saw it.
She had fallen forward onto her knees, chest down. The oversized neck of her t-shirt had slid completely forward with gravity.
I saw it.
The deep, beautiful valley between her braless breasts, obedient to the laws of gravity. Slightly damp with sweat or water, glistening faintly—that dizzying ravine imprinted itself directly onto my retinas.
Oh my god.
Thank you, Lord.
I froze on the spot. The rational part of me screamed that I should help her up. The animal part wanted to burn this image into my memory for one more second. They clashed violently.
A voice inside me whispered without my permission: This lewd bitch… testing innocent little me again…
Her face turned red enough to explode once she felt my stare. She curled up frantically, covering her chest. Then, almost sobbing, she spoke.
“S-sorry… for showing you s-something weird…”
Leaving only those words, she practically crawled on all fours in her panic, fled into her room, and locked the door. As if she had committed some horrible crime.
Thud.
The sound of the door shutting echoed down the hallway.
I was left standing there alone.
Her last words kept ringing in my ears.
Something weird?
That perfect work of art—the sacred thing that had driven me crazy for seven years—she called it something weird?
Heh… heheheh…!
I barely managed to swallow the laughter threatening to burst out.
That self-deprecating phrase snapped the final thread of my remaining sanity. She had no idea. No clue how incredible her body was, or what it meant to me.
That fact excited me so much it was almost disgusting.
I staggered back to my own room and locked the door.
I couldn’t hold back anymore.
Breathing hard, I yanked my pants down. My cock, already swollen to its limit, looked ready to explode at any second.
“Damn it… damn it, damn it!”
When I closed my eyes, the scene from moments ago replayed in 4K ultra HD.
Then it went even further.
In my imagination I approached the fallen Big Sis from behind and covered her body with mine.
Juhyuk… ahh! S-stop… d-don’t…!
The imagined Big Sis sobbed and resisted. But the script in my head was already written.
“Shut up, you slutty bitch! You fell on purpose knowing this would happen! Take it! Hah! Hah!”
“Hnnngh…!”
With an overwhelming surge of pleasure I released everything.
A few moments later, post-nut clarity hit. I cleaned up with tissue and stared blankly at the wall. Big Sis was right on the other side of it.
And one crystal-clear fact rose in my mind.
…Mom and Dad aren’t coming home tonight.
The moment that thought crossed my mind, something that had been suppressed for seven years finally snapped.
Fantasy wasn’t enough anymore. Just looking wasn’t enough anymore.
A dark, wicked smile spread across my lips.
Good. I’ve made up my mind.