Get out!!
Get out!!
After a brief moment of hesitation.
I let out a sigh and carefully opened Kang Seo-ah's door.
"...Seo-ah-ya."
The room was pitch-black inside.
The curtains were completely drawn, letting almost no morning sunlight in, and only the light coming through the door I'd left open behind me quietly illuminated the bed.
And—
"...!"
For a moment, I couldn't breathe.
Kang Seo-ah was sleeping completely naked without a single piece of underwear on, her arms resting on her stomach without even properly covering herself with the blanket.
White skin, large breasts that naturally drew the gaze, the soft curve from her waist to her hips.
The moment my sister's fully exposed naked body—except for her genitals—came into view, my mind went blank.
'What the hell...?!'
I quickly averted my gaze.
My heart was pounding like crazy.
Trying my best not to look toward the bed, I groped along the wall and approached the bed.
I fumbled with my hand little by little, finally grabbed the blanket that was barely draped over one thigh, and carefully covered Kang Seo-ah's body with it.
"Hoo... Seo-ah-ya, wake up. You'll be late for school."
I lightly shook her shoulder.
Kang Seo-ah murmured from under the blanket.
"Uugh... whyyy..."
Then suddenly, she wiggled her arm and flung the blanket off.
Once again, her breasts were suddenly exposed.
Since I'd been relieved that the blanket was on and was looking straight at her body, I ended up facing her exposed chest head-on.
'She's my sister, my sister. Sister. Get a grip.'
With my face flushing hot, I hurriedly pulled the blanket back up to cover her body.
I parted the curtain a bit to brighten the room slightly—
Then shook her shoulder harder this time.
"Seo-ah-ya, wake up."
"...Uum...?"
She slowly opened her eyes and looked up at me.
One second, two seconds... three seconds.
"Ah, aaaah...! What the hell?!!"
Then she suddenly screamed, grabbed the blanket, and yanked it up to cover her body.
Her face flushed bright red in an instant as she shouted.
"Get out! Get the fuck out, you perverted bastard!! Are you crazy, oppa?!"
"Hey, you were the one sleeping naked! I was just trying to wake you—"
"Shut up! Get the hell out! You're so fucking annoying!!"
She looked like she was about to throw a pillow.
I quickly stepped back and grabbed the door.
"Fine, fine! I'm going!"
The moment I stepped out into the hallway and closed the door, Kang Seo-ah's yell of "Pervert!!" echoed down the hall.
Thump!
And then, as the door shut, laughter erupted from behind me and echoed through the hallway.
"Puhahaha! Hey, Kang Si-woo! Your face is totally red! You saw Seo-ah's tits, didn't you?!"
Kang Yu-na, who had been watching the whole scene from behind the open door, was laughing her ass off, clutching her stomach.
It was so funny that tears were welling up in her eyes.
"Oh god, I'm dying from laughter. Our Si-woo got flustered seeing his sister's boobs, didn't he~?"
"...Shut up. If you knew, you could've helped me out, noona."
I muttered, covering my face with my hands.
But the scene I'd just seen wouldn't leave my mind.
The slightly pink nipples that stood out, and the sight of those two mounds of flesh swaying when she kicked off the blanket—
Slap!
'She's my sister, you crazy bastard. Get a grip.'
I slapped my cheeks, suppressing the thoughts that kept trying to surface.
My heart was still pounding.
Even if we were family, the shock of seeing my sister's bare chest—practically her naked body—right in front of me didn't fade easily.
And maybe because she was so beautiful, the shock lingered even longer.
Kang Yu-na was still chuckling, clutching her stomach, and patting me on the back.
"Go to school. You'll be late, Mr. Perverted Bastard."
"...Just stop it already."
To forget what had just happened, I changed into my clothes as quickly as possible, grabbed my bag, and headed out the front door.
It felt like Kang Yu-na's laughter was following me the whole way.
Throughout my entire walk to school, Kang Seo-ah's breasts wouldn't leave my mind.
'I'm crazy.'
After Kang Si-woo left the room, Kang Seo-ah was curled up on the bed, the blanket pulled all the way over her head.
Her face was so hot, her heart felt like it was about to burst.
'Kang Seo-ah, are you really crazy? Why did you sleep naked again...?'
She did tend to strip off her clothes when she was hot, but usually she woke up alone, and if someone woke her up, it was usually her eldest sister Kang Ji-eun, so it didn't matter.
Since her oppa rarely came in, she'd let her guard down—and this happened.
But...
He must have seen it, right?
'Oppa must have seen... my breasts, maybe even down there... everything.'
The moment she thought that, her lower abdomen burned hot.
She felt her thighs getting wet.
After kicking off the blanket, she spread her legs slightly and slowly moved her right hand down.
Chu-eup...♡
"Ah-eut..."
The moment her fingers touched her genitals, a small moan escaped.
Excited by the thought that Kang Si-woo had seen her naked, she began gently rubbing her clit, which seemed to have hardened slightly.
Recalling the situation from moments ago, she quickened her finger movements.
'If I hadn't told him to get out... if I'd pulled oppa in and dragged him under the blanket...♡'
Just imagining it made her body tremble.
The sight of oppa's flustered face staring at her chest.
Those hands groping her body, using that hardened cock to—
"Heung... oppa...♡"
She moved her other hand to her chest.
She pinched and twisted her nipples—the ones oppa had seen, the ones she wished oppa had touched.
The speed of her fingers rubbing her clit grew rougher.
Shame and guilt washed over her, but strangely, it only made her more aroused.
She'd yelled at Kang Si-woo to get out, calling him a perverted bastard.
But in truth, she knew better than anyone that the real pervert was herself.
The one who acts cold toward Kang Si-woo—her oppa—every day, gets annoyed at him, yet—
Behind his back, she sniffs his smell, uses her major to draw pictures of herself having sex with Kang Si-woo, and masturbates every day thinking only of Kang Si-woo's cock.
"Sorry, oppaa...♡"
'Fuck.'
No matter what I did, the image of Kang Seo-ah naked this morning wouldn't leave my head, and I couldn't focus properly.
I ended up spacing out through the entire lecture, and as soon as it ended around 5 PM, I grabbed my bag and headed home.
"I'm home..."
I called out weakly as I opened the front door and stepped inside.
The house was quiet.
Only the low hum of the air conditioner could be heard.
"No, why is it so cold? ...She didn't turn on the fan again, this sleeping beauty."
When I crossed the hallway and reached the living room, sure enough.
Kang Yu-na was sprawled out sleeping on the sofa.
"Haah. If you're gonna turn on the air conditioner, at least cover yourself with a blanket."
She was lying on the sofa, sleeping soundly in the same clothes she'd worn this morning.
But as she tossed and turned in her sleep, her pajama top had rolled up to her stomach.
Her white belly, slender waist, and even her navel were completely exposed as she lay on the sofa.
"..."
For a moment, the image of Kang Seo-ah naked this morning overlapped.
White skin, soft curves...
I was momentarily flustered and averted my eyes.
My face flushed hot.
'No, why do I keep...'
I shook my head left and right to clear my thoughts.
"...Isn't she cold?"
The air conditioner was blowing pretty hard, and Kang Yu-na was sleeping with her arms and belly exposed.
I couldn't let something like this lazy bum catching a cold and passing it to Kang Ji-eun happen, so I grabbed the blanket lying beside the sofa.
I carefully approached and was about to spread the blanket over her—
Flash—!
"...Huh...?!"
Kang Yu-na's eyes snapped open, and she quickly reached out and pulled me by the neck.
Completely unprepared, I was yanked toward the sofa, my body twisting around.
"This bastard! Trying to touch your sleeping noona's body!"
With a playful voice, in an instant, I was trapped between Kang Yu-na's thighs.
Her two legs wrapped around the back of my neck, and I was caught between her thighs.
The soft, warm flesh of her thighs pressed against my neck, and her body heat transferred directly through the thin pajama fabric.
"Ugh! It's a blanket, a blanket! I try to worry about you and you still cause a scene?!"
"Ha, you were pretending to cover me with a blanket but were trying to touch my body, weren't you? Be honest."
I struggled in panic, but Kang Yu-na's thighs tightened around me more and more, as if escape was impossible.
At that moment.
"Eeit♡"
Kang Yu-na suddenly pulled my head toward her with both hands.
My face, which had been resisting, was buried deep between her thighs—exactly into her crotch.
"...?!"
In an instant, something soft and warm pressed firmly against my entire face.
A soft, moist sensation felt through the thin pajama fabric.
That place—
Clearly, without a doubt, Kang Yu-na's genitals were pressing completely against my face.
Buried in her most private part, from my nose and lips to my cheeks, I momentarily couldn't breathe.
'Th-this is...'
Warm and soft skin, and a very faint trace of moisture.
More than anything, the scent of Kang Yu-na—which for some reason felt sweet—strongly stimulated the tip of my nose.
My mind went blank, and my body froze completely.
Kang Yu-na pressed my head there for about two more seconds with a push—, then released her thighs and pushed me away.
"Kyaaah~ Pervert!!"
She screamed, jumped up from the sofa, and ran to her room.
Thump—Bang!
Until the sound of the door slamming shut echoed.
I was left sitting on the floor in front of the sofa, dazed.
The soft sensation, the warm body heat, and the dense scent I'd never felt before still lingered vividly on my face.
'Just now, that... Kang Yu-na's...'
I wiped my face with my hand, but the feeling wouldn't fade.
Following the shock of seeing Kang Seo-ah naked this morning, now this...
My mind was completely scrambled.
'Why is this happening to me today...'
I sat on the sofa for a long time, blankly staring at the ceiling.
My heart was still pounding like crazy.
Bang!
Kang Yu-na slammed the door shut, leaned her back against it as soon as she was inside, and gasped for breath.
"Haa... haa...!"
Her heart felt like it was about to explode.
Pressing one hand firmly against her own chest, she covered her flushed face with the other.
Not just her face—her ears were burning too, heating up in real time.
'It touched, it touched...!'
The moment from just now, when Kang Si-woo's face was buried deep between her thighs—exactly at her crotch—kept replaying in her mind.
Through the thin pajama fabric, Kang Si-woo's nose, lips, and warm breath had transferred directly to her genitals.
"My pussy, Si-woo's face...♡"
Just thinking about it made her body tremble.
Her lower abdomen burned hot, and her panties, which had gotten wet from what she'd done, clung to her uncomfortably.
'I did it... I really...!'
She'd always initiated a lot of physical contact as a joke.
Because it felt so good to feel Kang Si-woo's body heat and scent—whether by putting him in a headlock, intentionally pressing her chest harder against him, or pretending to hug his waist.
Countless times, she'd come into her room and masturbated to those memories.
But this time... it was on a completely different level.
Normally, the sensation of touching his thigh would have been enough—
But impulsively, she'd deliberately pulled Kang Si-woo's head and rubbed his face completely against her most sensitive spot.
She'd fulfilled a dark desire disguised as a joke.
'I'm sorry, Si-woo-yaa...♡ But it was just so good, what can I do...♡'
Kang Yu-na crossed her legs and twisted her body.
Slowly moving one hand to the inside of her own thigh, she recalled the sensation from moments ago.
Kang Si-woo's warm cheek, the pressure of his nose tip pressing against her genitals, the feeling of his breath brushing against her...
She bit her lip and let out a small moan.
Guilt washed over her for having done such a terrible thing to her own younger brother, but strangely, it only made her lower body burn hotter.
"Huut...♡ If only it had lasted longer, it would have been even better...♡"
Kang Yu-na sat down on the floor, leaning her back against it, and slipped her fingers inside her pajama pants.
The sensation was still vividly lingering.