Big Sis, You're Beautiful
Weekend afternoon.
Last night, fully armed with the courage and self-justification I'd gained from the lunatics on that internet community, I decided not to wait for darkness to fall anymore.
If the world's gone insane, then I'll just lose my mind right along with it!
I dug out two dusty game controllers that had been gathering dust in my room and headed for my big sister's door with the solemn expression of a general marching to storm a castle.
Knock knock.
It was a bright, confident sound—completely different from the secretive knocks I'd used before.
"Big Sis, what are you doing? I'm bored. Wanna play a game? I'll treat you to something good. We can eat while we play."
There was a brief silence inside the room.
She was probably confused. She might have grown used to Juhyuk showing up at night with his perverted little "requests," but a Juhyuk who appeared in broad daylight just to purely say "let's hang out" must have felt completely alien.
Creak—
A moment later, the door opened just a crack and my big sister's face peeked out.
She looked back and forth between me and the controllers in my hands, her eyes full of wariness.
"A… a game…?"
"Yeah. Tekken. I'll show you the skills that once ruled the local arcade."
I acted as cheerfully as possible, playing the part of a pure little brother with zero ulterior motives.
She seemed to hesitate for a moment. But the keyword "game"—especially a game played together—proved too tempting for a shut-in to resist.
"…Come in."
Perfect. Just as planned. She's already gotten used to what we do at night, so now I need to make sure she doesn't feel any resistance during the day either. The goal is to get this shut-in to interact with me whether it's day or night.
I smiled victoriously to myself and strode confidently into my big sister's room.
Then I moved quickly and efficiently so the atmosphere wouldn't get awkward.
I connected the laptop to the TV, laid out a soft blanket on the floor to create the perfect gaming environment, and pulled up the delivery app on my phone to order every kind of snack and drink she liked.
When the food arrived and was arranged on the table, the room had transformed into a convincing replica of a PC bang.
"Alright, ready to go. What character are you picking, Big Sis?"
We sat side by side on the blanket and started the fighting game.
I naturally assumed I'd win. That was an enormous misconception.
"Huh? Whaaat?"
My character on screen never got the chance to come down from the air thanks to her flashy combos.
"…"
I looked back and forth between the screen and my big sister with an expression of pure disbelief.
She munched on a snack as if nothing had happened and said, "Th-this character's weakness is low attacks."
Hikikomori special trait: veteran gamer.
I'd completely forgotten about that.
No, no. Big Sis mainly plays dating sims and management games. She can't possibly be this good at fighting games too.
"That was just practice! This time it's for real!"
My pride was on fire now. I focused hard on the game again.
At first we just played awkwardly, but as the matches continued, our competitive spirits kicked in and things gradually got louder.
"Hey, Big Sis! That move is way too cheap! Are you just gonna spam it?"
"You're the one who couldn't dodge it…"
"Whoa, what the hell was that combo? Where did you learn that? You're totally a veteran!"
"I-I just… picked it up while playing…"
We laughed, shouted, teased each other, and spent time together like any normal siblings—or any normal couple.
There was a liveliness on my big sister's face that I hadn't seen even once in the past seven years.
I could tell she was genuinely enjoying herself.
Seeing that, something deep in my heart started to tingle again.
The final round. The score was tied.
I adjusted my grip on the controller, grinned, and made the suggestion.
"Big Sis, the last round will be boring if we just play normally. How about we make a bet?"
"A bet?"
"Yeah. The loser has to grant the winner one wish. What do you think?"
Caught up in the fun atmosphere of the game, she nodded without thinking much about it.
She had no idea yet that this choice would decide her fate.
"U-um… okay…"
The final round.
I went all in—using every dirty trick, psychological tactic, and ounce of my physical ability. I barely, truly barely, managed to win.
"Whew… I won, huh?"
I set the controller down and looked at her, savoring the winner's composure.
She was pouting her lips in disappointment.
"…I was about to win. I messed up at the very end."
She seemed slightly tense, clearly expecting me to make another perverted demand like last night.
I spoke slowly, my voice full of mischief.
"My wish is…"
She swallowed hard.
"Big Sis, let me have you for just one hour. I'll make you look pretty."
"…Eh?"
At the completely unexpected wish of "making her pretty," her face went white.
"M-make me pretty? Me? Why…?"
"Why? Because it's the penalty. You always wear the same t-shirt. I want to see you dressed differently sometimes."
I wasn't being forceful, but I stimulated the feminine curiosity hidden inside her.
"It's fine. I won't make you look weird. You know I'm majoring in cosmetology, right? I'll just do it with the heart of an older brother dressing up his little sister."
Instead of that stretched-out t-shirt, I want to see just how aggressively those massive breasts assert themselves.
Of course, I kept those inner thoughts to myself.
My big sister felt relieved that it wasn't a perverted request, yet she was torn—extremely embarrassed at the idea of letting someone else dress her up and style her.
But in the end, she had no choice but to accept the result of the bet she'd agreed to.
After thinking for a long time, she spoke in a small voice.
"…D-do as you want."
"Alright, shall we get started then? Big Sis, are you ready?"
Excited, I gathered various cosmetic samples, a curling iron, and a hair dryer from my stepmother's vanity.
Thank god I'm in the cosmetology department…
I sat her down in the desk chair and began the full transformation.
First came her hair, which hadn't been washed for days and was all clumped together.
I took her to the bathroom and washed it for her myself. Every time my fingers gently massaged her scalp, her shoulders twitched.
Damn… playing beauty salon like this is seriously hot. The shampoo scent is insane.
Should I sneak in a little touch? No, it's still too early.
After drying her hair, I combed it with clumsy hands.
The silky, flowing strands made her look like a completely different person from her usual gloomy self.
Using the curling iron, I added natural C-curl waves to the ends.
Next was her face.
I first removed her thick horn-rimmed glasses. Her large, clear eyes that had been hidden behind them were revealed.
"Big Sis, your eyes are seriously huge."
Wow, fuck. I knew her eyes were big, but I didn't realize the bangs were hiding half of them.
At my compliment, she shyly averted her gaze.
Knowing a full stylish makeup look would overwhelm her, I only applied a very light base and dabbed on a bit of lip balm to give her some color.
Even that alone transformed her face into something radiantly beautiful.
The final highlight was the outfit.
From deep inside my stepmother's closet, I pulled out a sky-blue dress she'd ordered years ago while watching a home shopping channel and saying "Oh, it's so pretty~" but had never worn once because it was too small… my stepmother's tragic, unworn dress.
"Here, Big Sis. Change into this."
After hesitating, she went into the bathroom, changed into the dress, and came out.
In that instant, I forgot how to breathe.
Oh… my… god.
The dress fit her as if it had been tailored for her. But there was one exception—the chest area.
Her overwhelming breasts stretched the fabric so tightly it looked like it might burst.
Paradoxically, that only emphasized her narrow waist and voluptuous figure even more.
That's not clothing. It's just wrapping paper meant to contain those massive tits! Those buttons are literally screaming right now! They're begging to be saved!
Fuck, is that fabric even going to hold? How is it still intact?
I stood her in front of the full-length mirror in the room.
When my big sister saw her reflection, she was rendered speechless.
There stood a "woman" she'd never seen before—one that had been hidden behind stretched t-shirts, thick glasses, and clumpy hair.
She found her own appearance so unfamiliar and embarrassing that she didn't know what to do with herself, only fidgeting with her fingers.
I stood behind her.
And through the mirror, our eyes met.
In a voice that surprised even me with how entranced it sounded, I murmured:
"…Wow. Big Sis… you're seriously beautiful. It suits you so well…"
My sincere admiration.
In that moment, I watched her expression flood with panic.
She realized that the way I was looking at her in the mirror was no longer the gaze of a "little brother."
It was the hot, unmistakable look a man gives a woman.
The air between us changed in an instant.
It was the beginning of a new relationship… and not a bad change at all.