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Early in the morning, Si-woo woke up.

Si-woo woke up early, feeling oddly refreshed despite his troubled mind.

The night before, he had exhausted himself with a fierce masturbation session, using Se-hee's panties. He tossed them into the laundry with a mix of guilt and relief, trembling from the sinful act yet comforted by the thought that he hadn't crossed the final line.

He truly cared for Se-young, his sweet and lovable little sister, who was three years younger than him.

Always cheerful and doted on by the entire family, even their tough older sister Se-hee made an exception for her. Si-woo's affection for Se-young was profound. If he had to choose one person to save in a fire, it would undoubtedly be her.

That's why he managed to leave her room last night, despite the overwhelming lust he felt for his sleeping, defenseless sister. It was almost a miracle, an act of sheer will, that he protected their relationship.

As he stepped into the shower to wash away the remnants of his debauchery, Si-woo vowed to never again harbor such desires for Se-young. He remembered how he had left her room in such a hurry, not even covering her with a blanket.

After the shower, he walked through the dark living room to Se-young's room. She was curled up, sleeping soundly. The girl who had so violently shaken his heart moments ago was now just his adorable little sister again. Si-woo felt reassured.

He gently covered her with a blanket and watched her for a while before leaving the room. As he walked back through the dim living room, he noticed a light coming from the slightly open master bedroom door. A strange sense of unease washed over him as he heard faint, moaning sounds.

Curious, Si-woo peeked through the gap. There, under the bright light, lay his mother in the same position she had when nursing Se-young.

Her eyes were covered with a sleeping mask, and her mouth opened and closed sensually. She had one hand inside her panties, moving frantically, while the other hand held Se-hee's pants—the same ones Si-woo had defiled just hours earlier.

His heart pounded as a wave of arousal hit him.

'Why is Mom doing this?'

He couldn't make sense of the scene, overwhelmed by the sight of his mother's erotic display. His massive erection grew as he watched, and he began to stroke himself with both hands, matching her movements.

Her huge tits and voluptuous hips swayed rhythmically.

The sight of his mother writhing in pleasure drove him to the brink.

He fought the urge to rush in and release his load on her breasts, torn between lust and hesitation.

Then he thought of Se-young. His resolve crumbled easily despite his earlier vow, but he knew deep down that he would eventually cross that line.

Si-woo pulled up his pants and quietly returned to Se-young's room. She was still asleep, unaware of the turmoil around her. He lowered his pants again and brought his throbbing cock close to her face, wrapping his hand around the massive shaft and stroking it without caution.

He imagined her lips around his cock, remembering how she nursed at their mother's breasts. His cock brushed against her lips, sending an electric shock up his spine.

The sensation was too much, and he erupted, covering Se-young's face with his cum.

Breathing heavily, Si-woo looked at her cum-covered face. He placed a finger on her lips, spreading the sticky substance around. It was as if he was performing some perverse ritual of accepting his guilt.

***

As Si-woo recalled the events of the previous night, his body felt like it was on fire. The feelings were a complex mix of amazement, pride, embarrassment, and distress.

He got up and headed to the first-floor bathroom. Normally, he would use the second-floor bathroom upon waking. But today, he was drawn downstairs by a need to verify the remnants of last night, which felt like a surreal dream.

The laundry room, which also served as a dressing room, was adjacent to the bathroom. Si-woo opened the washing machine lid. The laundry was spinning inside, proving that any evidence of last night had already been dealt with by his mom.

A strange excitement mixed with his disappointment. He imagined his mom cleaning up after what had been a climactic event for him.

After a quick wash, Si-woo walked into the living room. His mom and his sister, Se-young, were in the kitchen preparing breakfast. Seeing his mom bring back the image of her on the bed last night, blindfolded, he writhed to the scent of his cum.

"Si-woo, you're up early today,"

His mother greeted him with a smile.

Her voice and demeanor were completely normal.

Si-woo was sure she knew he had jerked off to the sight of her breasts and Se-hee's panties. He was also convinced she was awake when he flicked her nipple.

Thinking about it, he realized no one would remain asleep after such a sensitive area was touched with that much force. If she had woken up, her natural reaction would have been to cover herself and sit up. The minimal movement she had shown was a poor attempt at pretending to stay asleep.

Si-woo finally understood and was certain now. His mom had been awake, pretending nothing had happened, just like she was doing now.

What would her smiling face look like if she knew that he knew? The thought made Si-woo feel oddly exhilarated.

"Yeah, I slept great after, you know, letting off some steam last night."

Si-woo deliberately hinting at his masturbation to see his mom's reaction.

"Did you exercise before bed?"

Si-woo couldn't tell if she was genuinely oblivious or just pretending. Her nonchalant response spurred him to push further.

"No, not exercise… But, Mom, didn't you sleep well after doing the same thing last night?"

"Wh-what?"

Seon-mi stammered, clearly taken aback by his insinuation. For a brief moment, his mom's eyebrows twitched in surprise.

It was a fleeting expression, one that only Si-woo could read.

In that split second, a secret spark of understanding passed between them, making Si-woo feel a strange sense of dominance and accomplishment.

"I moved Se-young after that, right? Mom must've slept like a log because of it."

Siwoo spoke as if hinting something to his mother.

"O-oh yes… thanks to you, son… I slept well last night,"

Seon-mi trying to sound casual but with a hint of unease. She clearly thought Si-woo couldn't possibly know about the late-night events.

"Today, I'm making zucchini stew. Do you like that, oppa? Even if you don't, you should eat a more~!"

Se-young said cheerfully.

Just hours ago, that same cheerful face had been covered in Si-woo's cum.

Those lips, once smeared with his seed, now chartered away brightly.

"I'll eat anything you make, Se-young,"

Si-woo replied, feeling a new resolve towards his sister. He exchanged a familiar glance between his mom and Se-young, feeling a twisted sense of satisfaction.

Chapter 14

As Seon-mi and Se-young were preparing dinner, Se-hee came downstairs.

She wore a white short-sleeved turtleneck with a hole cut out around the chest, making her large breasts even more pronounced.

Through the hole, her ample cleavage was excessively exposed.

Below, she wore a short, tight purple skirt that clung to her slim, toned thighs. Se-hee, who had been active in sports until middle school, had always had a decent fashion sense, preferring modest and neat outfits, often influenced by Seon-mi's taste.

However, lately, she's been wearing more revealing clothes, and it's becoming more frequent.

That level of exposure is really pushing Mom's nerves to the edge.

Siwoo thought it was probably the influence hrt friends he had seen yesterday.

"Wow, everyone's already here?"

Se-hee called out as she descended the stairs, her steps deliberately exaggerated. She smirked when she noticed Si-woo staring at her and then took a seat across from him.

"Se-young, how do I look today?"

Se-hee at her youngest sibling, clearly fishing for compliments.

"Unnie~, you look beautiful, like a celebrity!"

Se-young praised her, grinning from ear to ear.

"Aw, Se-young, you always say the nicest things. Should I buy you something yummy?"

Se-hee's excitement was apparent, surprising Si-woo.

"Se-hee, did you buy more clothes? I saw a bunch of new clothes piled up in your room yesterday?"

Seon-mi remarked, a hint of irritation in her voice.

"I didn't buy more; I went shopping with friends and bought them all at once,"

Se-hee replied, looking aggrieved.

"Then you should organize them properly! Your room is a mess!"

Seon-mi's nagging continued.

"I-I'm tidying up bit by bit."

Se-hee's body is shrinking like a deflated balloon.

Si-woo couldn't help but notice how her enormous breasts seemed even more prominent, threatening to spill out of the turtleneck's hole.

He shifted uncomfortably, trying to hide his growing erection by pulling his chair closer to the table.

Se-hee noticed his reaction and straightened up, speaking in a playful tone to Seon-mi.

"Mom, Aunt Seon-ju said I should come over after school today."

"Seon-ju? Why?"

Seon-mi asked, puzzled.

"She called last night and said she wanted to buy me some clothes."

"Why clothes all of a sudden?"

"I don't know. Anyway, I'll be back before dinner, okay?"

Seon-mi reluctantly agreed, understanding Se-hee's excitement.

Unlike Seon-mi, Seon-ju was more open-minded and had a special bond with Se-hee.

They shared similar interests and often communicated well. Occasionally, Seon-ju would buy Se-hee surprise gifts.

As dinner was being served, Si-woo's erection hadn't subsided. Instead of feeling embarrassed, being surrounded by his family while secretly aroused added to his excitement. He kept sneaking glances at Se-hee's chest, occasionally meeting her gaze, but she didn't seem to mind.

Feeling like he was secretly in control of all the women in the house, Si-woo enjoyed this hidden thrill. However, the feeling was fleeting.

As dinner ended, he waited for the right Seon-mient to slip back to his room without drawing attention to himself.

Taking advantage of a moment when Seon-mi turned to clear the dishes, Si-woo hurried back to his room. Despite having masturbated intensely the past few days, he couldn't believe how easily he got aroused by Se-hee's body.

He admired his persistent erection before packing his things and heading to the school.

***

At school, Cheol-jin was absent from the first period. When he finally arrived, Si-woo suspected it had something to do with Gyu-Ri.

If that little troublemaker hadn't shown Si-woo how he slapped Gyu-Ri's ass, Si-woo wouldn't ended up like this and have ejaculated on his mother's and his sister's panties, and on Se-young's face.

During lunch, Si-woo casually asked Cheol-jin about Gyu-Ri.

"Is your mom okay?"

Cheol-jin sighed deeply.

"My dad got transferred to headquarters, so he'll be home all the time now."

Cheol-jin's complaint made Si-woo feel a bit down, but he reminded himself that Gyu-Ri was still a married woman.

Gyu-Ri was his mother's friend and his friend's Seon-mi. Just seeing her in those awkward positions and slapping her ass was already a big deal for a boy his age.

To cheer up, Si-woo suggested they go to a PC café after school, but Cheol-jin declined, saying he had plans.

Despite finding his behavior suspicious, Si-woo didn't press him further. On his way home, Si-woo looked at the photos he had taken of Gyu-Ri during her yoga session, pondering what to say to her next time.

**

By dinner, the family gathered again. Se-hee returned from Seon-ju's, carrying several shopping bags and looking satisfied.

She went to her room to change and prepare for dinner. Seon-mi and Se-young finished setting the table, and Si-woo came downstairs, oblivious to the turbulent evening ahead.

**

Dinner time.

Se-hee emerged wearing a black mesh boxy tee that left little to the imagination, revealing her purple bra. Her slim waist and smooth stomach were on full display, and her white shorts hugged her hips.

She sat directly across from Si-woo, giving him a confident look.

Unsurprisingly, Si-woo got hard again, struggling to find somewhere to rest his eyes.

"What are you wearing!?"

Seon-mi's exasperation was clear.

"Isn't it pretty? Aunty chose it for me~!"

Se-hee responded with a giggle, trying to brush off Seon-mi's irritation.

"You can't wear something so revealing with Si-woo around."

Seon-mi's brow furrowed in frustration.

"What's the big deal? He's my brother. My friends walk around in their underwear at home, even with their dads and brothers there!"

Se-hee pouting and stuffing some jokbal into her mouth.

"That's how they were raised, but not in our house!"

Seon-mi's voice grew sharper.

"But it was like that here too until Si-woo went to middle school!"

"It's not like that now!"

"Come on, Si-woo doesn't mind, right?"

Se-hee pleaded, dragging Si-woo into the argument.

"Uh… yeah,"

Si-woo stammered, his eyes darting to her huge breasts. They bounced as Se-hee leaned over to him for support. He quickly lowered his head and pushed around his rice with his spoon.

Seon-mi glared at Se-hee, her patience wearing thin.

"Change your clothes now."

"I just want to eat. I'll change after."

Se-hee protested, but it only infuriated Seon-mi further.

"Can't you see you're making Si-woo uncomfortable? Do you want to cause trouble?"

Seon-mi's voice was cold, clearly referencing Si-woo's erection. Si-woo's heart pounded with panic.

"Hey, what are you talking about? I wear what I want at home! If Si-woo has weird thoughts and acts like a little pervert, that's his problem, not mine!"

Se-hee retorted, her voice rising in defiance.

Si-woo's eyes widened at Se-hee's heated words, and the tension in the room thickened.

Finally, Seon-mi slammed her hands on the table, causing the dishes to jump and clatter. Both Se-hee and Si-woo jolted in surprise.

She stood up abruptly, towering over Se-hee with a look that could kill.

"Hey? Hey?! Did you just 'hey' me? How dare you talk back to Mom and call your brother a pervert? Do you want me to beat you to death today?!! OK, THAT'S IT. GET UP AND STOP EATING! GET UP!"

Seon-mi's voice was a thunderous roar, her anger completely exploded.

Tears welled up in Se-hee's eyes as she reluctantly stood, realizing she had pushed Seon-mi too far this time.

The room fell into an uncomfortable silence, the weight of Seon-mi's fury hanging heavily in the air.

Seon-mi stood in the living room clutching a plastic broom, her face a mask of anger. Se-hee's tears overflowed, streaming down her cheeks.

"Se-young, if you're done eating, go to your room, close the door, and do your homework!"

Seon-mi sent her youngest to her room first. Se-young hurriedly left, casting worried glances back at Se-hee as she walked away.

"Si-woo, you sit right there!"

Si-woo, already too scared to move, gratefully complied with Seon-mi's command and sat back down.

"Se-hee, come here!"

Seon-mi's voice was terrifying as she called Se-hee. Crying, Se-hee approached Seon-mi.

"For days, I've been telling you to clean your room, but you've ignored me! You're a senior in high school, spending money on clothes and makeup, letting everything pile up without organizing anything!"

Seon-mi's sharp eyes bore into Se-hee, and she unleashed everything she'd been holding back.

Se-hee, head bowed, continued to sob.

"And cigarettes and a lighter! Did you think I wouldn't find them hidden in your bag? You waste all your allowance on that junk!"

Seon-mi must have gone through Se-hee's bag.

At the mention of the cigarettes and lighter, Se-hee's eyes widened in genuine shock. She looked at Seon-mi, tears streaming down her face, and started crying even harder, covering her face with her hands.

"sniff..sob…sob…"

"Se-hee, tell me the truth. When did you start smoking?"

Seon-mi pressed her, demanding answers.

"Whimper… It's not mine. A friend asked me to hold it… I wasn't smoking."

Despite her tears, Se-hee tried to lie her way out of it.

"What friend would ask you to hold cigarettes? Are you lying to me now?"

Seon-mi wasn't buying it.

"Si-woo, did you know your sister was smoking?"

Seon-mi turned to Si-woo, who had been watching in silence.

Caught off guard, Si-woo hesitated, glancing sympathetically at his sister.

"….Si-woo, do you smoke too?"

Seon-mi's questions kept coming. Afraid of being implicated, Si-woo quickly shook his head.

"Si-woo, tell the truth! I know you knew! When did you find out your sister was smoking?"

Seon-mi wasn't going to let this go.

"A few days ago, at the park. I saw her smoking with her friends."

Si-woo admitted, watching Se-hee's reaction.

"Alone?"

"No, with her friends."

"Which friends?"

"Shinbi noona and some girls I didn't know."

Si-woo shared what he knew, and Se-hee's face twisted in betrayal, glaring at him.

Whack!

Seon-mi punched Se-hee hard on the head.

"Why are you glaring at your brother? You want to pick on him now too? If you lay a finger on Si-woo, I'll make sure you regret it!"

Seon-mi's eyes blazed with anger as she scolded Se-hee.

"Ugh, Mom, why did you go through my stuff?"

Se-hee clutched her head where Seon-mi had hit her, making a feeble last attempt at defiance.

"You think you can talk back after what you've done? Do you want me to beat you until you scream for mercy?"

Seon-mi raised the broom and struck Se-hee's thighs and legs without mercy.

Whack! Whack!

"Ah! Mom!"

Whack!

"Argh!"

Se-hee screamed, grabbing onto Seon-mi desperately.

"Mom, I'm sorry! I'm sorry! I won't do it again!"

She kneeled down, crying and begging for forgiveness.

"Mom, I was wrong. I won't do it again. Sniffle."

Seon-mi glared at her.

"What did you do wrong?"

"Smoking."

Se-hee confessed reluctantly.

"And?"

"Not cleaning my room."

"And?"

"Lying."

"And?"

"Umm…talking back to you. Sniff."

"What else?"

"What else? Umm…"

Se-hee racked her brain, struggling to think of another misdeed.

"Clothes!"

Seon-mi's voice rose again.

"Um…wearing revealing clothes and making Si-woo uncomfortable. Sobs."

Se-hee lay down on the floor, crying loudly. Si-woo felt terrible for her.

Was it really worth all this punishment? But he didn't dare intervene.

"Didn't I tell you the thing I hate most is lying?"

Seon-mi's scolding continued.

"Sniffle…Yes…"

Still lying on the floor, Se-hee responded meekly.

"You lied to me today, so you're not getting any allowance for a month."

Seon-mi's decree made Se-hee look up in despair.

"And if you get caught doing this again, I'll break your legs. Understand?"

"Sniff… I know I was wrong, but can you please not cut my allowance? I have things I need to buy."

Despite her remorse, Se-hee still clung to the hope of keeping her allowance.

"Do I look like I'm joking?"

Seon-mi's voice rose again, her face stern.

"Mom, please…"

Se-hee's face was a mess of tears and snot as she pleaded.

"Do I need to beat some sense into you?"

Seon-mi lifted the broom again.

"Okay! I won't do it again, Mom! I'm sorry! I don't even smoke that much, really!"

Se-hee grabbed Seon-mi, desperately pleading.

"I only pretend to smoke with my friends so I don't look weird. Those cigarettes aren't mine. I swear. Sobs…"

She collapsed to the floor, crying harder.

"Not giving me any allowance is too much. Sobs…"

She could barely speak through her tears.

Seon-mi sighed, her anger softening a bit.

"First, go clean your room. We'll talk about your allowance after that. Si-woo, go clean your room too. I'll give you both fifteen minutes."

***

Se-hee and Si-woo climbed to the second floor.

"Sob You, you snitched on me…sob…Who told you to talk…sniff///Because of you, I got caught lying~ sob"

As soon as they reached the second floor, Se-hee spoke to Si-woo, still hiccuping and breathing heavily.

"How was I supposed to lie to mom in that situation and you were already caught."

Si-woo felt guilty.

"Sob…why do you have to bring up Shin-bi too?!….sniff….Didn't I tell you I'd kill you if you talked? You jerk…sniff.."

Se-hee started hitting Si-woo's arm with her fists.

"Ouch, ouch, it hurts, noona!"

"If I don't get my allowance because of you, you better give me half of yours! Got it? Waaah~"

Se-hee started sobbing again, covering her face with her hands.

"Okay, okay, don't cry. I'll handle everything!" Si-woo said, trying to console her.

Despite the situation, Si-woo found his crying sister both pitiful and endearing. Her black mesh top, through which her purple bra—covering her large breasts—peeped, looked even sexier.

**

After tidying up the room, Si-woo and Se-hee went downstairs to face their mother, who stood with her arms crossed.

"Did you finish cleaning your rooms?" their mother asked, still sounding irritated.

"Yes, we did," Si-woo and Se-hee answered in unison.

"If your rooms get messy again, no more allowance for either of you, understood?!"

"Yes," they replied, their voices meek.

"And Se-hee, if I catch you smoking again, I'll break your legs, got it?"

"Yes."

"And apologize to Si-woo for what you said earlier."

Was their mother upset because she knew Si-woo wasn't actually a pervert?

"I'm sorry, Si-woo. I didn't mean what I said earlier. It just slipped out. It was my fault."

Her apology was stiff and awkward, like reading from a script.

"Yeah… okay," Si-woo replied. He was still shocked by what Se-hee had said but didn't take it to heart.

"Lying is unacceptable. But maybe a month without allowance is too long. From now on, no allowance for two weeks," their mother declared.

"Okay," Se-hee responded with a sorrowful tone, resembling a tragic heroine.

"And stop wearing the clothes Auntie gave you. Are you out of your mind? Have you ever thought about what might happen if you wear such revealing clothes?"

Their mother looked at Se-hee with a mix of frustration and concern.

Se-hee started crying again, tears streaming down her face. "I only wore it because Auntie picked it out and it was pretty. I didn't mean to cause any trouble for Si-woo. I thought you'd like it too, Mom. You're being so unfair. Waaah~"

Seeing her daughter in such distress, their mother sighed deeply.

"Come here, Se-hee."

She called Se-hee over and hugged her, gently patting her back to soothe her.

"I'm sorry I didn't understand how you felt, Se-hee. I know you didn't mean any harm. It hurt you when I got angry, didn't it? But you know those kinds of clothes aren't appropriate, right?"

Her tone had softened, and she was speaking kindly now.

"Ugh… yes… Ugh…"

Se-hee continued to sob in her mother's arms, clearly feeling better but still emotional.

"I'm sorry, that was my fault. I shouldn't have been so harsh. I'll buy you some clothes you like. Does that sound good? Now, stop crying, okay?"

Their mother spoke in a gentle, calming tone, trying to comfort her daughter.

"Really? Sob, will you really buy me clothes I want to wear? Sob sob…"

Se-hee replied between sobs.

"Yes, but no sexy clothes, okay?"

Their mother kept patting Se-hee's back.

"Okay… I understand, Mom, sob, sob, sob."

Se-hee clung to her mother, sniffling and acting like a child.

"You two may be grown-up in size, but you're still kids at heart!"

With that, their mother continued to hold Se-hee for a while before applying some ointment to her bruises and sending her to her room. Then she turned to Si-woo.

"Si-woo, we need to talk."

Chapter 16

"We need to talk."

Hearing that, Si-woo's heart started pounding. She led him to the master bedroom.

With a ton of things he could be caught for, Si-woo started recalling all the messed-up stuff he'd done.

Is she going to talk about his boner at the dining table? Did she find out about him jerking off with Se-hee's panties? Or worse, did she catch him flicking her nipple while she pretending to be asleep?

There's no way Gyu-ri told his mother about the incident from the other day, right?

But he couldn't shake the fear that Gyu-ri might have ratted him out to his mom about the previous day's incident.

His mind was racing with all sorts of thoughts.

"Why don't you sit over there?" His mother pointed to the stool in front of the vanity, her tone unreadable.

Si-woo sat there, tense and scared, waiting for his mother to speak.

The same bed where she'd been breastfeeding Se-young last night.

The same bed where he'd flicked her nipple.

The same bed where she'd masturbated with Se-hee's cum-stained panties.

Seon-mi sat on the edge of the bed, crossing her legs. Her white thighs contrasted starkly against the dark fabric of the bedspread, drawing Si-woo's gaze irresistibly.

He couldn't help but stare, his eyes tracing the smooth lines of her legs.

After a moment of silence, she finally spoke.

"It's about Se-young… As you know, she's been very clingy lately," Seon-mi began, her voice steady but concerned. "We went to the hospital yesterday for tests. Your little sister… Se-young might have an anxiety disorder, and her baby-like behavior is one of the symptoms."

His mother shared the story of their hospital visit yesterday.

"The doctor said that punishing her or stopping these behaviors could make things worse. I should've told you earlier, but I just fell asleep last night."

Seon-mi paused, looking a bit embarrassed.

"You saw me breastfeeding Se-young when you moved her last night, didn't you?"

Recalling the sight of her large breasts, Si-woo blushed and nodded instead of replying.

"Se-young has been pestering me to breastfeed her lately. After the hospital visit, we decided to let her nurse a bit before bed. I didn't want you to think anything strange was going on."

She looked at him cautiously, as if gauging his reaction. It seemed she wasn't about to dig into his misdeeds after all.

Si-woo felt a wave of relief and fought back tears.

"Don't worry about it, Mom. It's nothing weird. It actually looked kind of nice. Do whatever feels comfortable for you. If it helps Se-young and lets you sleep better, it's a win for both of us."

He tried to reassure her, hinting that he knew she was awake during his little stunt.

"That sleep mask must be really effective. I tried waking you a few times, but you didn't budge. Normally, you'd be up in no time."

"Uh?…uh…yeah, oh yeah, that mask worked wonders last night."

Seon-mi replied, a bit flustered, as if admitting she remembered his actions.

"You're going to use it again tonight, right?"

"Yes, I'll use it again tonight."

"Then, I'll do the same as last night?"

Si-woo's question held a different meaning, one that made his heart race.

"Yes… yes. With the mask on, I'll be in a deep sleep and won't wake up."

Despite their seemingly mundane mother-son conversation, Si-woo was trembling with excitement.

**

As 10 PM approached, Si-woo's anticipation grew. His cock had been hard since he left the master bedroom.

The clock struck 9:58 PM, prompting him to stand up from his desk, open his door, and head downstairs. The light from the master bedroom spilled into the dark living room, guiding his steps.

Entering the room, Si-woo was greeted by the sight he had been eagerly awaiting. His mother lay on her side, a sleep mask over her eyes, her large, white breasts exposed.

Se-young was latched onto one nipple, suckling contentedly like a baby. Si-woo's breath hitched as he took in the scene.

In a low voice, Si-woo called out, "Mom, are you asleep?"

There was no response, but he couldn't tell if she was awake or not.

He carefully checked to make sure Se-young was asleep before gently lifting her. Seon-mi's breast, slick with Se-young's saliva, was fully exposed, glistening in the dim light. A thin, silver strand of drool stretched between them.

He caressed Se-young's back and bottom, touching her inappropriately while his mother, either asleep or pretending to be, lay nearby.

Si-woo slid his hand between Se-young's legs, feeling her heat against his throbbing cock. The sensation sent shivers down his spine.

He couldn't tear his eyes away from his mother's breasts as he used Se-young's body to pleasure himself, lost in the intoxicating mix of lust and desire.

"Mom?"

He called again softly, still no answer, but he knew she was awake.

"I'll move Se-young to her room and be back to turn off the lights," he said, trying to gauge her reaction.

Leaving his mother where she was, he gently carried Se-young to her room, feeling every inch of her body pressed against him.

He laid her down in her bed, his hands lingering on her small frame a moment longer than necessary.

Si-woo returned to the master bedroom. His mother hadn't moved, her breasts still exposed, a tantalizing temptation.

Remembering her earlier words about the sleep mask, he took it as an invitation.

He reached out and gently squeezed her breast. The soft flesh filled his hand, molding around his fingers.

His other hand slipped inside her robe, caressing her waist, then her hips, and finally gripping her firm buttocks.

He lightly pinched her nipple, twisting it, while his other hand massaged her ass. His mother's breathing became heavier.

Feeling mischievous, Si-woo traced words on her ass with his finger.

'I'

'saw'

'my'

'mom'

'masturbating'`

As his finger spelled out each letter, his mother's body reacted more than when he had groped her.

Thrilled by her response, he resumed fondling her, this time more aggressively.

He remembered Se-hee getting spanked by their mother with a broom earlier.

Withdrawing his hand from inside her robe, Si-woo slapped her ass hard, mimicking the timing of their mother's spanking.

His mother's body shook, her cheeks flushed beneath the mask.

Si-woo then traced more words on her ass.

'Sister'

'Allowance'

'Please'

With each stroke of the letters, her sensitive ass twitched with each line he wrote. He could feel her muscles tighten under his touch.

Pulling down his pants, Si-woo began to masturbate, holding her breast. Just as he was about to climax, he paused and ran to the laundry room.

Finding one of Se-young's panties, he came into it, wanting to show his mother the extent of his depravity.

Afterward, he left the cum-stained panties on the laundry room floor and returned to the master bedroom.

His mother hadn't moved. He latched onto her breast, sucking where Se-young had been, tasting the mix of milk and saliva.

"Mom, I'm going to turn off the lights and head to bed," he said, pretending to leave. Then he remembered something.

"Oh, I almost forgot one thing."

He leaned in close to his mother, his voice dropping to a whisper.

"This is for hitting Se-hee earlier," he said, his tone filled with a mix of reproach and resolve.

With a swift motion, he bent his middle finger against his thumb and flicked her nipple hard. The sharp sensation caused her to gasp loudly.

"Aoooohhhhh~!!!!"

The sound escaped her lips as she gasped, her body shaking violently, as if she had the wind knocked out of her. Her reaction was immediate and intense, trembling with a mix of surprise and sensation.

Chapter 17

It was early the next morning.

"Si-woo, wake up! Si-woo, wake up!" Se-hee shook him urgently.

"Huh? What's wrong, Noona? What's going on?" Si-woo, groggy and half-asleep, asked, noticing that Se-hee looked unusually distressed.

"I think someone's been following me and watching me!" Her face was full of fear as she spoke.

"You woke me up for this? Did you have a bad dream or something?" Si-woo initially thought Se-hee was overreacting due to a nightmare after being scolded by their mom the previous day.

"No, I'm serious!"

Thump!

"Get up quickly!"

Thump!

She pounded on Si-woo's chest, making him wince.

"Ow, Noona, that hurts."

Si-woo grabbed her wrist to stop her from hitting him again and sat up. "I had a bad feeling since yesterday. I think someone took pictures of me!"

"What?" Seeing his sister's seriousness, Si-woo decided to listen carefully.

"I often get my photo taken by strangers, so I usually ignore it. But yesterday, that person followed me home!"

"They followed you home?"

"Yes! I went out for a jog just now, and when they saw me, they panicked and hid in an alley!"

Si-woo started to feel worried. If someone had indeed followed her home, this could be a serious issue.

"Did you see their face?"

"No, they were wearing sunglasses and a mask. I couldn't see anything."

"Hmmm…"

Si-woo thought for a moment before speaking.

"Should we call the police?"

"How can we report something like this?!"

Se-hee snapped, clearly frustrated.

"Then what should we do?"

Si-woo scratched his head, genuinely at a loss. Se-hee gave him a look that said she found him utterly hopeless.

"You know I'm only getting half my allowance for two weeks because of you, right?"

He promised to give her half of his allowance to make up for it.

"Yeah…"

"Think of it as paying me back!"

"What?"

Si-woo sensed the conversation was taking an unexpected turn.

"Be my bodyguard for two weeks!"

Se-hee declared with a mischievous grin.

And so, Si-woo found himself roped into accompanying Se-hee on her morning jogs and to and from school, playing the role of her reluctant protector.

***

Leaving the house and running through the park, they eventually reached a jogging path along the river.

Se-hee wore a slim-fit black hoodie and tight leggings. As she ran, cutting through the crisp morning air, Si-woo couldn't help but understand, as a guy, why someone might want to follow her.

Watching her run, Si-woo also realized there was no way anyone could catch her if she kept this pace. She was a pro.

By the main road near the park, Si-woo struggled to keep up with his sister, panting heavily. As he stopped to catch his breath, he felt an unsettling gaze from somewhere in the residential area they were heading toward.

An unpleasantly familiar feeling.

***

After their jog, Se-hee took a shower in the first-floor bathroom. Si-woo used this time to check for any traces of the previous day's events. The floor was clean, and the washing machine had already been run. A sense of satisfaction filled him.

As he turned to leave, he noticed Se-hee's freshly discarded underwear in the laundry basket. Her sweat-soaked sports panties caught his eye. Without thinking, Si-woo picked them up and stuffed them into his pocket.

He walked out, pulling aside the curtain separating the bathroom from the rest of the house. In the kitchen, his mom and Se-young were starting breakfast. His mom noticed him first.

"Oh? Si-woo, you're up early today. Is Se-hee using the shower?"

His mom greeted him with her usual smile, as if nothing unusual had happened.

She must have seen Se-young's panties with his cum on them, cleaned them, and put them in the wash. She had felt him groping her breasts and ass, yet here she was, acting as if nothing had happened.

There was an unspoken, deceptive understanding of their mutual secrets, shared between a mother and her son.

Si-woo felt a thrilling sense of superiority.

***

At the breakfast table, Se-hee's outfit was modest and ordinary, but it did little to conceal her figure. The atmosphere between her and their mom was still a bit tense after last night's scolding. However, through normal conversation, the awkwardness was slowly dissipating.

"Did you take Si-woo jogging this morning?" their mom asked, looking at Se-hee.

"Yeah, I woke him up early, and we went together," Se-hee replied cautiously.

"That's good to hear. You should help Si-woo get into exercising, Se-hee. And you, Si-woo, should follow her lead!"

Their mother spoke in a higher tone than usual, likely trying to lighten the mood. She continued the conversation naturally, shifting her attention to Se-hee.

"Se-hee, are you okay from yesterday? Will it leave any bruises?"

Seon-mi's voice laced with concern as she gently placed a hand on Se-hee's shoulder.

"I'm fine, Mom. It's just a small bruise."

Se-hee replied with a slight smile, sensing her mother's worry and wanting to reassure her.

"Mom might have overreacted a bit yesterday. Are you very upset?"

Their mom stroked Se-hee's back, just as she had when comforting her last night.

"It's okay. I felt better once you understood how I felt."

Se-hee leaning into her mother's comforting touch.

"I thought about it, and it was harsh of me to cut your allowance for two weeks… I'll give it back."

"Really? Thank you, Mom! I'll be good from now on!"

Se-hee exclaimed, hugging her tightly. Their mother hugged her back with a pleased smile.

For a moment, Si-woo caught his mother's gaze and thought he saw a hint of embarrassment before she quickly looked away.

***

Throughout breakfast, Si-woo was painfully aware of his erection, throbbing with the kind of excitement that felt ready to explode at any moment.

He tried to hide it by pulling his chair closer to the table, but part of him didn't care if anyone noticed.

Si-woo felt a surge of satisfaction knowing that his command last night—it didn't feel like a mere request—had worked on his mom. Her behavior today, the way she avoided eye contact, had an alluring quality that excited him even more.

Se-hee and Se-young finished their breakfast and went back to their rooms. Si-woo, still hard, lingered at the table, pretending to eat slowly, while his mom cleared the dishes and began washing them.

With her back turned, her body faced the sink. Her oversized purple T-shirt and the grey pleated skirt she wore clung to her curves, especially her ass, which subtly swayed with her movements, tempting Si-woo.

Heart pounding, he stood up and walked over to her, his cock straining against his pants. He let his knuckles brush against her ass as if by accident.

His mom's ass tensed briefly at the contact before relaxing again, the firm, supple flesh sending a thrill through Si-woo's hand.

He glanced sideways to see her blush deeply, head bowed, looking flustered but not stopping her task. She didn't say anything to him, and that made her seem even more irresistibly charming.

Si-woo's body trembled with desire. He wanted nothing more than to thrust his cock into her pussy right then and there. The urge surged from deep within him, but he managed to hold back, remembering that Se-hee and Se-young were still in the house.