"…Hello?…Uh…Mom?"
Jinwoo answered his mom's call with a cautious tone.
"…Did you buy this at the convenience store this morning?"
His mom's voice sounded calm.
It seemed the details of Jinwoo's card transaction had been texted to her.
The condoms and band-aids he bought at the convenience store this morning—
Luckily, the specific items probably weren't listed.
"…Yeah…I…thought I might need them…"
Jinwoo stuttered awkwardly, explaining to his mom.
"Why did you buy so many? What happened to the ones you bought before?"
His mom spoke to him as she normally did.
"Ah…I used them up quickly…And I didn't know when you'd be back…"
Jinwoo carefully made excuses, wary of getting scolded.
At the same time, he subtly hinted at the sexual relationship they'd have when she returned.
"Ha…seriously…"
His mom lets out a disbelieving laugh.
They had already exchanged countless lewd messages that would be unthinkable for a normal mother and son.
Yet, they had also spent their entire lives as mother and son.
The one-sided sexual encounter they'd had and the incestuous exchanges over chat these past few days didn't seem to have completely overturned their everyday relationship.
But Jinwoo's heart raced at the precarious thought that this fragile balance could collapse at any moment if they chose to.
A thick, rising excitement swelled inside him.
Jinwoo switched his phone screen to their chat log.
Then, he started typing a message to his mom.
'Haemi, when you get home, I'm gonna tear open the whole box and use every last one on you, so be ready!! Got it?'
He sent the message like a master issuing a warning.
Soon, the "1" next to the message disappeared.
Blood rushed violently to his penis, making it swell so much it was hard to walk.
"I won't say anything about you buying them, but if you're gonna get more, go to a pharmacy next time! Convenience stores are expensive."
Even after reading his message, mom pretended nothing happened and spoke normally.
"Okay, got it… I'll buy them from the pharmacy like you said…"
Jinwoo obediently replied.
He felt a strange thrill knowing she deliberately ignored his text during the call.
Not only that, even though she knew about his sexual relationships with Sohee and Haeju, she acted like buying condoms was natural, almost as if she silently approved.
Given her position, she probably couldn't openly interfere with his affairs with Haeju or Sohee.
Maybe she thought that since she couldn't stop it, ensuring contraception was better than risking an unwanted pregnancy in the family.
"And how did you already use up what was left in just a few days?! You should've paced yourself!"
Her nagging continued.
She had likely called after seeing the condom purchase in his transaction history.
"It just happened that way. You weren't home! Hehe… Didn't you say to always use protection? But now that you're coming back, they might run out even faster."
Jinwoo shamelessly teased her, shifting the blame.
He relished having this kind of conversation over the phone.
"Wh-what's this 20,000 won withdrawal? Did you take it out at school? You didn't even tell me!"
Flustered by his teasing, she quickly changed the subject to the withdrawal.
"Uh…that… A friend needed to borrow it urgently…"
Jinwoo reverted to playing the flustered son, scrambling for excuses.
"That card was for emergencies! You can't just hand out money like that!"
She scolded him sternly.
Jinwoo felt unbearable disgust at her acting like a strict, caring guardian.
Just earlier, at Aunt Gyuri's house, he had uncovered his mom's past.
His phone still held the photos and documents he'd received there.
Group sex, lesbian play, even fake marriage vows…
Pretending to marry her best friend's unborn child…
Even holding a wedding ceremony with that friend's baby…
Jinwoo tried to justify his sadistic urges toward her by dwelling on her past.
But he didn't feel like exposing it just yet.
He reopened their chat.
'You bitch, you're the one who told me to use them, and now you're acting like this?!'
'Haemi, from 9 PM to 6 AM, you're staying naked!'
'If you keep acting up, I'll add an hour to both ends! Got it?'
He sent the messages one after another.
The "1" next to each disappeared.
In this chaotic performance where neither could tell what was real anymore, his erection throbbed unbearably.
Though they maintained the facade of a normal mother-son relationship, their mutual understanding of their master-slave dynamic was undeniable.
"Huuu…"
His mom's suppressed sigh came through the phone.
"Sorry, Mom… But my friend really needed it…"
Hearing her frustrated sigh, Jinwoo played the dutiful son again.
"It's fine to help friends… But you should've asked me first!"
Her voice trembled slightly.
She seemed determined to ignore all his texts during the call.
"Okay, I'll tell you everything next time."
Jinwoo answered, hiding his rising excitement.
"Th-there's nothing else going on, right?"
She hurriedly tried to end the call.
"Nope… Nothing special…"
He replied in his usual tone.
"Don't stay up all night just because I'm not there! Go to bed early!"
She nagged him like nothing was wrong.
"Got it, Mom! Love you~!"
Jinwoo played the sweet, obedient son.
"Y-yeah… Love you too. I'll hang up now—call me if anything happens, okay?"
Her voice shook as she dodged his boldness.
**
Jinwoo stayed silent for a moment.
"…Jinwoo?"
Worried by his silence, she called his name again.
"Mom, did you properly greet Haeju this morning? How was it?"
Instead of answering, he threw out a question meant to embarrass her.
"What do you mean how…? It was the same as usual!"
Her voice wavered, likely recalling the awkward encounter.
Last night, both sisters had been exposed to each other as Jinwoo's playthings.
His order to pretend nothing happened seemed to be holding up.
"Should I tell Haeju to acknowledge you tonight?"
He teased, deliberately saying something shocking.
"Wh-what are you talking about?! Why would she?!"
She reacted sharply, her voice rising in panic.
She knew all too well that one word from him could make it reality.
Even if they knew each other's secrets, sharing her son with her younger sister was still too much for her.
"Haha. Just kidding~ Why so jumpy? You're cute when you're flustered. No wonder Haeju teases you."
He laughed, continuing to mess with her.
"Ugh! Jinwoo, what's wrong with you?! We're on the phone right now!"
She sounded genuinely annoyed now.
Even outside their chats, his teasing flustered her.
At that moment, Jinwoo imagined both his mom and Haeju kneeling before him, and licking his cock together.
The humiliated expressions on their faces fueled his excitement.
"Sorry, sorry! Okay, okay… No need to get mad. It was just a joke… Hehe… I'll call if anything happens. Calm down and get some rest."
He soothed her with a few more words before finally ending the call.
After hanging up, his erection strained painfully, ready to burst.
With emotions swelling inside, he headed home.
He reopened their chat to reread the messages he'd sent during the call.
Filled with insults and demands no normal mother and son would ever exchange.
Then, a new message arrived from his mom:
'I'm already stressed enough that Haeju and Sohee know because of you! And now you're making me talk about this over the phone, it's so embarrassing!!!'
Her text sounded like a whiny complaint.
'Just make sure you wear those condoms, you brat!! -_-^'
Ending with a cute, teasing nickname and an angry emoji, something Sohee might use.
Jinwoo found her so adorable he wanted to rush to Haeju's house and pounce on her right then.