Her Younger Sister
「……You had a guest?”
Eun-su’s eyes widened slightly.
She glanced over at Tae-seok sitting at the dining table, then shifted her gaze between Eun-jung’s flushed face, her disheveled hair, and the faint trembling still running through her legs.
As if sensing something off, a slow, creeping curiosity rose in her eyes.
Eun-jung’s heart sank the moment she met that look.
Between her thighs, her juices were still slowly trickling down.
Every time the sticky, slippery sensation slid along her skin, she instinctively pressed her legs together and forced a smile.
The fact that her panties were an absolute mess beneath her skirt hit her with an even sharper wave of shame in front of her sister.
“Say hello. He’s the student living in our rooftop room. I sometimes make him breakfast and such.”
Eun-jung tried her best to sound casual, but the end of her sentence trembled slightly.
Tae-seok stood up and greeted her naturally.
“Hello.”
“Yes… Hello.”
The moment a new target appeared, a Status Window materialized centered on her.
Name: Kim Eun-su
Age: 34
Occupation: Fitness Club Owner & Trainer
Emotion Level: 12 / 100
Dominance: 0 / 100
Special Notes:
• Currently in divorce proceedings with husband
Eun-su gave a light nod, but she kept tilting her head, still clearly puzzled.
She had a strong feeling that something was strange, yet she couldn’t quite put her finger on exactly what it was.
Tae-seok gave Eun-jung a quick glance and spoke softly.
“Auntie, thanks for the meal. I’ll head back up now.”
“Mmm… sure. Go ahead.”
Eun-jung answered with forced cheerfulness.
As Tae-seok walked toward the front door, she stood there pressing down on her skirt with one hand.
The moment Tae-seok left, Eun-jung looked at Eun-su and asked,
“What on earth is going on? First thing in the morning?”
Instead of answering, Eun-su flopped down heavily onto the sofa.
She sank deep into the cushions as if all the strength had left her body.
“Sis. I’m really going through with the divorce this time.”
Eun-jung’s hand froze mid-motion.
She asked in a quiet voice,
“You… how long have you even been married…”
“Does that even matter?”
Eun-su cut her off sharply.
“If it doesn’t work, we split. That bastard treats me like a complete rag.”
At the crude words, Eun-jung’s expression stiffened slightly.
She stayed silent for a moment before speaking a beat later.
“…Still, you should at least try to make it work. Didn’t you… behave badly too?”
Eun-su let out a short, bitter laugh and shook her head.
“Behave badly?”
She tilted her head and stared at Eun-jung.
“Ha… You’re still saying things like that, sis?”
Eun-su crossed one leg over the other and leaned back even deeper.
“I deal with club members all day. Smiling and playing along is basic. He can’t understand that. He’s always suspicious, checking my phone, cursing at me.”
Eun-jung’s face grew tighter and tighter.
“He doesn’t even earn money. He buys luxury goods and drives around with the money I make. And yet he still screams at me to ‘behave more modestly.’”
Eun-su paused mid-sentence and looked her sister up and down.
Her eyes changed subtly.
“But sis.”
She leaned forward, moving closer to Eun-jung.
“You’ve gotten really pretty. Look at your skin. What have you been eating lately?”
Eun-su playfully lifted Eun-jung’s cheek with one hand and widened her eyes in mock surprise.
“You got some treatments, right? Or…”
The corner of her mouth slowly curved upward.
“Did you get yourself a man?”
At that moment,
Eun-jung’s gaze dropped.
She tried to smile like nothing was wrong, but the corners of her mouth froze awkwardly.
“What are you even…”
The moment the words trailed off, heat rushed all the way to her ears.
Eun-su didn’t miss the reaction.
“Aha~ So I’m right.”
She laughed softly and moved even closer.
“You do have someone, don’t you?”
She whispered, peering into Eun-jung’s face.
“Who is it?”
“If you’re just going to keep saying ridiculous things, get out!!!”
Eun-jung finally snapped, her face turning serious.
“Tch… If it’s not true, then it’s not. Why are you getting so defensive? Anyway… I’m going to stay here for a few months.”
“Huh? What do you mean?”
Eun-jung’s eyes widened.
Eun-su let out a small sigh and scratched her head.
“Actually… I already filed the divorce papers. I think I’ll need to stay here until it’s over. I don’t want to be in the same house as that bastard.”
“Haa… You really…”
Eun-jung pressed her forehead and let out a long sigh.
Eun-su looked at her sister and laughed playfully.
“Why? Don’t want me here? I’ll get some beauty treatments with you and we can both get prettier. Hm? You can even tell me your skin-care secret.”
Tae-seok was leaning against the rooftop railing with a cigarette between his lips when he heard footsteps on the stairs. He let out a small smirk.
‘Must be Auntie Eun-jung.’
He had been replaying the morning’s interrupted session with Eun-su in his head the entire time.
Tae-seok took a deep drag, feeling his lower body begin to harden again.
‘This time I’ll finish properly…’
He was smiling to himself when the person who reached the top of the stairs turned out not to be Eun-jung.
It was Kim Eun-su.
Her toned, athletic body—honed by constant exercise—was tightly wrapped in sleek leggings and a cropped t-shirt. The curve of her breasts, narrow waist, and especially her voluptuous hips and thighs drew the eye with magnetic force.
Her high ponytail swayed gently in the breeze.
Tae-seok was momentarily caught off guard but quickly composed himself.
“Hello. Is something wrong?”
Instead of answering, Eun-su slowly approached and looked him up and down with deliberate care.
Her gaze was filled with both curiosity and blatant scrutiny.
She took one more step closer and asked in a low, direct voice.
“You… what exactly is your relationship with my sister?”
Eun-su crossed her arms and took another step forward.
The slight tilt of her head was provocative.
A faint smile played on her lips, but her eyes gleamed cold and sharp.
“This morning… you two weren’t just eating breakfast, were you?”
Each word carried the heavy pressure of ‘I already know everything.’
Tae-seok leaned against the railing, took a long drag from his cigarette, then slowly exhaled while looking down at her with relaxed composure.
A smile spread across his face.
There wasn’t the slightest trace of panic.
On the contrary, as if finding the situation amusing, he narrowed his eyes and studied her carefully.
‘She’s a completely different character from Auntie Eun-jung.’
Unlike her quiet and gentle older sister, the younger sister was bold and aggressive.
That overflowing confidence and those unfiltered, piercing eyes were quite intriguing.
Tae-seok stubbed his cigarette out on the rooftop floor and answered lazily.
“We didn’t just eat… there was dessert afterward, after all.”
He deliberately left the sentence hanging, letting the implication linger.
The ambiguous aftertaste thickened the air, and in that moment Eun-su’s eyes flashed.
She uncrossed her arms and placed one hand on her hip.
The gaze that openly sized him up contained clear displeasure, and beneath it, a strange flicker of interest.
A short scoff escaped her.
“Dessert? Ha… Stop beating around the bush and tell me straight.”
She closed the distance with another step.
“What exactly are you doing to my sister?”
Tae-seok didn’t answer right away.
As if savoring her reaction, he leisurely met her eyes.
Then he let out a light chuckle.
“Your eyes already say you know everything, don’t they?”
At those words, Eun-su’s expression twisted subtly.
“What… so you really did it with my sister…”
She didn’t finish the sentence, but the meaning was crystal clear.
Tae-seok shrugged lightly as if it were no big deal.
“Don’t worry. It’s not that serious.”
At that moment, Eun-su’s eyes changed completely.
“What?”
The hand on her hip tightened, and her posture grew even sharper.
“Not that serious? My sister isn’t the type to casually meet men.”
She took yet another step closer.
They were now so close their breaths could mingle.
“Are you… just playing with my sister?”
Despite the blatant suspicion, Tae-seok’s expression remained perfectly relaxed.
“Between a man and a woman, who’s really ‘playing’ with whom?”
He tilted his gaze slightly and added,
“We’re meeting because we both enjoy it.”
That calm tone only irritated her more.
The corner of Eun-su’s mouth twisted upward.
“How could a guy like you possibly…”
Before she could finish, Tae-seok smoothly cut in.
“Why? Curious?”
He didn’t retreat an inch. Instead, he pushed his gaze even deeper into hers.
“I could show you…”
A brief silence fell.
Eun-su said nothing, simply looking him up and down.
Then she exhaled shortly and spoke.
“Fine… show me.”
The corner of her mouth lifted subtly.
“Show me exactly what you did to my sister.”
Tae-seok glanced briefly toward the stairs, then turned his eyes back to her.
“Talking about it here is a bit awkward…”
He turned his body naturally as he finished speaking.
“Would you like to come into my room?”
Eun-su didn’t move immediately.
Instead, she only tilted her head slightly and slowly scanned his back.
“…You.”
Her voice was low.
“What kind of trick are you trying to pull?”
Tae-seok stopped and turned only his head.
A light smile still hung on his lips.
“Do you think my tricks would work on you?”
He chuckled briefly and added,
“Even if we fought, I’d probably lose.”
After those words, another short silence passed.
The wind sweeping across the rooftop gently swayed Eun-su’s ponytail.
She stood there wordlessly for a moment, then finally nodded.
“Alright. Let’s go in.”
This time, she took the lead and walked first.
The instant the door to Tae-seok’s room closed, he roughly shoved Eun-su against the wall.
The moment her back hit the wall, Tae-seok snatched her right wrist like lightning.
“Hey!!! What the hell are you doing?”
Eun-su shouted sharply and immediately tried to yank her hand away.
But in that brief moment, some kind of ‘energy’ transmitted from his firm, hot grip made her body tingle all over.
Her body instinctively reacted to that touch.
Eun-su felt her thighs clench slightly without meaning to.
“You asked me to show you. I’m not trying to do anything weird to you. You said you wanted to know, so I’m showing you. At first… it started like this. I held her hand right here in my room.”
He took a step back as if to reassure her.
“Oh, actually, Auntie Eun-jung grabbed my hand first… but would it be okay if I keep holding yours?”
Eun-su’s breathing grew slightly ragged.
She tried to maintain a cold expression, but she could feel the tips of her ears burning red.
“If you’re uncomfortable, you can leave anytime.”
Tae-seok deliberately spoke politely and created space so she could open the door and walk out.
“You seduced my sister just by holding hands? And she grabbed yours first?”
Tae-seok nodded silently.
“Crazy… just from that? There’s no way. There must have been something before that. Maybe my sister felt sorry for you because she’s too kind…”
Eun-su glared at him for a long time.
His relaxed attitude was starting to get on her nerves more and more.
Eventually she let out a small sigh and said,
“…Fine. Keep going.”
