Getting an erection in front of your sister like that
Getting an erection in front of your sister like that
In the middle of sleeping.
I woke up feeling a sudden urge to urinate.
My body felt heavy, but my bladder was so full I couldn't hold it anymore.
I sighed, kicked off the blanket, and opened my bedroom door with half-closed eyes.
The hallway was dark.
It felt like the house was filled with nothing but silent stillness.
As I was about to pass by Seo-ah Kang's room to get to the bathroom—
Just then.
"...Mmm♡"
A small, stifled moan leaked through the crack in the door.
I stopped in my tracks for a moment.
As I strained my ears, I heard a faint, blurry sound.
Someone, muttering something in a very small voice... a sweet yet wet sound of breathing.
"Si-woo oppa...♡"
'...What the?'
The sound was coming from Seo-ah Kang's room.
But it was too quiet, and with the door between us, I couldn't make out exactly what was being said.
I took one step closer to Seo-ah Kang's door.
I held my breath, practically pressing my ear against the door.
However, no more distinct sounds could be heard.
Only a very faint presence, like someone catching their breath, could be felt from beyond the door.
'...Did I hear it wrong?'
I thought I might have heard things in my sleep.
In the end, I shook my head and walked to the bathroom.
If I got caught eavesdropping with my ear against Seo-ah Kang's door, it was guaranteed that she would really hate me.
But on the way back to the hallway, I found myself glancing back at Seo-ah Kang's door once more.
The door was still firmly shut, and no sound could be heard from inside.
"I must have heard it wrong in my sleep."
I was more grateful than ever that I didn't have to go to school because I had no classes.
After going to the bathroom in my sleep-deprived state, I tossed and turned until late before finally falling back asleep, and I woke up when it was already daytime, dragging my tired body out to the living room.
I flopped onto the sofa and blankly turned on the TV.
The screen turned on, but nothing registered in my eyes.
That faint, ambiguous sound I heard in front of Seo-ah Kang's room at dawn kept circling in my head.
I'm not exactly sure, but...
Now that I think about it, it sounded like a moan.
The thought that I might have heard my own sister masturbating made me feel strange.
I shook my head violently to try and shake off the thought, but it didn't work well.
Click— Thud, thud.

As I was lost in thought, I heard the sound of a door opening, followed by sleepy footsteps.
Yu-na Kang came out to the living room with a face that hadn't fully woken up yet.
She was in her pajamas, her hair a mess, rubbing her eyes as she approached.
Yu-na Kang sat down right next to me without a word.
Then, she naturally tilted her body slightly and rested her head on my shoulder.
It was just an unconscious lean, as if she hadn't fully woken up yet.
The feeling of her hair tickling my shoulder wasn't bad.
"Mmm... Hey, you have no classes today, right...?"
"Yeah."
When I answered shortly, Yu-na Kang smiled slightly as if satisfied and lowered her body.
"Then just for a second... I'll use you as a pillow."
Then she naturally turned her body, plopped her head onto my thighs, and lay down.
At first, it was just comfortably relaxing with the feeling of her soft hair and warm body temperature touching my thighs.
But the moment I lowered my gaze—
Because of her lying position, Yu-na Kang's pajama top had opened wide, revealing her voluptuous cleavage.
It was an angle where I could see almost everything, from her soft skin and deep valley to the slightly exposed outline of her nipples.

"...!"
I quickly turned my gaze away and fixed it on the TV.
But those large breasts kept entering the edge of my vision.
The skin that jiggled every time she moved her head caught my eye.
I tried hard to focus on the TV, but the screen just wouldn't register.
I was quite flustered.
I should be fine since she's my own sister... maybe it's because her body is unnecessarily, undeniably too good.
I scolded myself internally to get a grip, but my gaze kept wanting to drift down.
I gripped the remote control tightly and stared intently only at the TV.
Just then, Yu-na Kang spoke to me again in a sleepy voice.
"...Is it fun?"
"Yeah. So get off now, let me watch TV."
When I said that bluntly, Yu-na Kang made a "Hng..." sound, turned her head, and shook it from side to side.
Her soft cheek rubbed against my thighs.
"I don't want to? For this pretty noona, you should endure a little discomfort~"
"Hey, hey...!"
Perhaps Yu-na Kang's playfulness was piqued by my reaction—
Swoosh—
She stood her body up to the side and turned her face toward me.
At that moment, her face ended up right in front of my crotch.
"..."
For some reason, Yu-na Kang's eyes went blank for a moment.
It was as if even her breathing had stopped.
"Ah, no, don't do that...!"
I tried to stop her in a hurry, but it was already too late.
Along with the visual stimulation from her large breasts, which were even more exposed as she turned her body.
As her warm breath and gaze focused on my crotch, my dick started to slowly swell up.
I could feel it gradually taking shape through the thin fabric of my pants.
Yu-na Kang's eyes widened as she watched that from a distance of less than a few centimeters.
She was startled and jumped up, raising her upper body.
"...You pervert!!"
Yu-na Kang shouted, her face turning bright red.
'I'm screwed. Seriously, I'm really screwed.'
My life flashed before my eyes.
As all sorts of negative imaginations ran through my head, and I was being disowned in my imagination.
Yu-na Kang, pretending not to be flustered, pointed her finger at me exaggeratedly—

"Getting an erection right in front of your noona! You really are a pervert! Hahaha—!"
She was forcing a laugh as if trying to gloss over the situation pleasantly.
Even though she was teasing me like that with her mouth, she was having trouble meeting my eyes, her ears turning red.
Only then did I come to my senses, closing my thighs and covering it with a sofa cushion.
"I-it's because it's morning!! No, why are you rubbing your face there in the first place, rubbing it...!"
"Ha, what an excuse!"
Yu-na Kang giggled while looking at me, her face still flushed, but there was a subtle tremor in her laughter that was different from usual.
'Fuck. Fuck.'
Fortunately, thanks to Yu-na Kang seemingly trying to just move past the situation, the possibility of me being disowned seemed to have decreased.
But the situation itself was absurd.
Getting an erection because of my own sister.
"Mr. Sex Offender Si-woo Kang. Have fun watching your porn~"
"Ah, no..."
Yu-na Kang glanced at me one last time and walked quickly into her room.
When the door closed, silence descended on the living room.
I sat slumped on the sofa and couldn't move for a long time.
Clack!
Yu-na Kang slammed the door shut and went inside.
She stood with her back against the door for a long time.
Her heart was pounding like crazy, and not only her face but even her ears were burning hot.
"...Haa, haa..."
She couldn't breathe properly.
She staggered to the bed and flopped down on the edge of it.

The events from just a moment ago were only now hitting her as reality.
It was true that she had buried her face in Si-woo Kang's thighs and teased him even more mischievously on purpose.
The fact that she wasn't wearing a bra at home.
Rubbing her cheeks on his thighs.
Bringing her face right in front of his crotch and intentionally blowing her hot breath on it.
It was all intentional, that was true.
But it was all done because of her own desires.
It was because she couldn't resist the situation where she could secretly smell Si-woo Kang's crotch under the guise of playing around.
"But."
"Si-woo Kang... got an erection because of me."
That unexpected fact filled her mind.
That volume that slowly, slowly grew through the thin fabric of his pants.
That image of it gradually revealing its shape seemed to still be vividly remaining in her vision.
"Huuu...♡"
Yu-na Kang covered her face with both hands.
Her breathing became increasingly rough.
She had run away to her room, pretending not to be flustered, acting nonchalant, and teasing him...
But in reality, she had barely managed to hold herself back from pouncing on Si-woo Kang's erect dick.
To calm her excited body, she adjusted her position and lay down on the bed.
Both hands were simultaneously throwing off her pajama pants and top.
Finally, as the long pajama pants came down along with her panties, and her fingers touched her wet pussy, a small moan leaked out.

"Mmm..."
She started rubbing her clitoris gently, then gradually harder.
With her other hand, she grabbed her already hardened nipples and, conversely, her breasts, which were softer than anything else.
The gaze she felt fleetingly when she was looking at Si-woo Kang's face with her eyes half-open.
It was visible enough that he was trying to avoid looking, but she saw that his gaze kept instinctively wanting to drift down.
"Si-woo Kang...♡ If you got an erection because of me, then you too...♡"
"Family."
"Things I only thought about because we're siblings, perhaps—"
Just that thought made her lower parts even hotter.
Her finger movements sped up.
She spread her thighs slightly, lifted her waist a little, and rubbed her clitoris like crazy.
"Haat♡ Y-you looked at my breasts...♡!"
She closed her eyes and recalled the situation from just a moment ago.
That moment when Si-woo's crotch was growing bigger, that moment when her face was almost about to touch it.
The climax approached rapidly.
Yu-na Kang gritted her teeth, kneading her breasts harder with one hand, while rubbing her clitoris rapidly with the other.
"Hup...♡ Si-woo Kang...!"

Her small body trembled, and she reached her climax while gripping the blanket tightly.
Love juice flowed down her fingers and soaked the bed sheets.
After catching her breath for a long time, Yu-na Kang slowly opened her eyes.
It was the moment she stared at the ceiling and made a resolution.
That she would seduce Si-woo Kang, little by little.