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Jinwoo tapped the speaker button on his smartphone screen while he was on a call.

The call with his mom switched to speakerphone.

Jinwoo laid his smartphone right next to Sohee's ear.

Then, he placed his now free hand, which had been holding the smartphone, on Sohee's pussy.

Jinwoo smeared his palm with the slippery lubricant dripping from Sohee's pussy.

With his lubricated hand, Jinwoo wrapped his fingers around his cock and slowly started jerking off.

Thud! Thud! Thud! Thud! Thud!

The sound of flesh smacking echoed in the silent conversation with his mom.

Mom didn't reply, just listened to the lewd noises Jinwoo was making.

"Mom?!"

Jinwoo called out to his mom while continuing to jerk off.

"Uh...yeah...!?"

Caught off-guard by Jinwoo’s call and the sounds of masturbation, Mom hesitantly replied.

Thud! Thud! Thud! Thud~! Thud~! Thud~! Thud! Thud! Thud!

Jinwoo deliberately changed the pace of his jerking hand, making sure his mom could hear the sounds.

Mom's breathing grew slightly rapid.

"Hmm~ what are you doing?"

Jinwoo kept jerking off while provocatively asking Mom to speak up.

"Just... getting ready~"

Mom stuttered in response, sounding flustered.

"Minji is not waking up and sleeping right beside you, right?"

Jinwoo kept shaking his cock, engaging Mom as if to keep her attention.

"Yeah...she...she's sleeping well!"

Mom earnestly tried to respond to Jinwoo’s question.

"Sohee seems to be sleeping well beside me too~"

With his semen-covered hand, Jinwoo squeezed Sohee’s large breasts as if milking them.

"Huuuuh~haaaah!"

A faint moan escaped Sohee.

Jinwoo moved his hand, resting on Sohee’s breast, towards her pussy.

The upper part of the split crevice...

Jinwoo found a sensitive, red protrusion and smeared the semen around it with his hand.

Sohee slightly curled up, looking pitifully at Jinwoo, probably worried about getting pregnant because of the semen on his hand.

Jinwoo placed Sohee’s clitoris between his index and middle fingers and gently rolled it.

"Huuuh~haaaat!"

Despite only gently pressing and rolling, a strained breath burst from Sohee’s mouth.

Sohee’s body seemed to be heated up.

Sohee turned her head away from the direction where the smartphone was placed.

It looked like she was trying to prevent her voice from being picked up by Jinwoo's smartphone mic.

It seemed like a futile gesture...

Thud!! Thud Thud!! Thud Thud!! Thud Thud!! Thud!!

Jinwoo’s hand, gripping his cock, moved more violently and rhythmically.

"Since Minji is sleeping well, Mom! I guess I can do what we did just now again?"

Jinwoo said, lowering his voice as usual to Mom.

"Huh? What...what?"

Mom responded as if her mind was blank.

"Don't you remember? The thing we just did!"

Jinwoo said with a slightly mischievous tone.

Jinwoo was thinking of making Mom masturbate again during the call, just like he had instructed her earlier.

"That...what was it just now?"

Mom really seemed clueless as she asked back.

Frustrated, Jinwoo took his hand off Sohee’s clitoris and picked up the smartphone.

He scrolled down the call screen and opened the chat window to text Mom.

'Masturbate, you fucking bitch! You know it, why pretend you don’t?'

Jinwoo’s coercive command and scolding message were sent to Mom.

Soon, the '1' next to the message disappeared.

"Haaah~"

Mom sighed softly and then was silent for a moment.

"Mom~?"

Jinwoo called out to Mom as if nothing had happened.

"Yeah?"

Mom responded inadvertently matching Jinwoo’s tone.

"Remember now?"

Jinwoo asked Mom casually.

"Huh? Oh. Yeah, I...I remember"

Mom answered, her voice wavering a bit in confusion.

"Going to do it?"

Jinwoo asked Mom, trapping her like prey in a corner.

Jinwoo continued masturbating while waiting for Mom's response.

Thud! Thud! Thud! Thud! Thud!

Each vigorous shake of his hand made the sound of flesh smacking loudly, spreading a precarious sensation of pleasure throughout his body.

**

A moment later, a text from Mom arrived.

'Jinwoo~ but does Mom really have to do it now? Sohee is sleeping right beside, isn’t she?'

Mom seemed troubled by Jinwoo’s command.

'Mom, you fucking whore! Who told you to speak informally to your master? Speak politely and call me Master!!'

Jinwoo sent a threatening message to Mom.

"Huuuuh...huuuh..."

As the '1' disappeared, Mom's breathy, excited sighs flowed from the smartphone.

"Mom, are you okay?"

Jinwoo asked gently, pretending to be unaware.

"Huh? Oh... ye...yeah, I'm okay~"

Mom answered, her voice trembling with embarrassment.

"Concerned about Sohee?"

Jinwoo casually asked Mom.

"That...she's sleeping right beside, isn’t she?"

Mom seemed genuinely troubled as she spoke.

Jinwoo typed another message in the chat window.

'I saw Sohee and Haeju’s photos before calling you, you fucking bitch! Why play coy and freak out?'

Jinwoo scolded Mom harshly through another text.

Mom couldn't say anything, neither in the chat nor on the call.

"Just wait a sec, Mom~!"

Jinwoo spoke to Mom in a friendly tone before stopping his masturbation and approaching Sohee.

He gently pushed Sohee’s body with both hands to make her lie on her side.

Sohee compliantly followed Jinwoo’s touch.

Sohee was now looking in the opposite direction of Jinwoo’s location, lying on her side.

Sohee’s body slightly bent forward.

Her back, waist, and buttocks were exposed to Jinwoo.

From the staircase to the room, Sohee had been spanked by Jinwoo.

Her buttocks were swollen red.

Jinwoo placed his hand on Sohee’s buttocks and gently rubbed them.

Sohee seemed to anticipate what Jinwoo was going to do, her body trembling slightly.

Jinwoo intended to let his mom hear the sound of him spanking Sohee’s buttocks along with Sohee’s moans.

He raised his hand high and then slapped Sohee’s buttocks.

Smack! Smack! Smack!!

"Haahat! Huuuuh! Haak!!"

With each meaty slap, a painful moan followed from Sohee.

Jinwoo caressed Sohee’s buttocks.

"Huuuuh"

Sohee buried her face in her arms and moaned sorrowfully.

"Mom?"

Jinwoo called out to his mom again.

"...Yeah?"

Mom responded reflexively to Jinwoo’s voice.

"Now you don’t have to worry about that kind of thing~!"

Jinwoo reassured Mom.

Waiting motionlessly for Mom’s response, Jinwoo’s self-made sounds of masturbation and Sohee’s pained moans were no longer audible.

Jinwoo’s cock twitched as if it might burst any moment.

"Haaaaah...uh~"

A long, trembling sigh came through the smartphone’s receiver from Mom.

Jinwoo focused all his attention on the sounds coming through the smartphone.

Mom seemed hesitant, again entering a silent moment of contemplation.

'Fucking bitch! Answer quickly?'

Jinwoo texted, cursing and pressuring Mom to reply.

Smack!

"Huuuuuh!"

Thwack!!

"Haahak!!"

Jinwoo started slapping Sohee’s buttocks multiple times with his palm, as if he was taking a hostage and threatening.

Jinwoo’s hand stopped again.

"Jinwoo...Jinwoo~!"

Mom’s urgent voice came through the speakerphone.

"Yeah~?"

Jinwoo immediately replied.

"Mom’s keeping the promise we made before, right?"

Mom asked Jinwoo in a desperate voice.

"Yeah?"

Jinwoo responded, asking back as if to confirm.

"Can...can you later turn me back into just Mom?"

Mom pleaded, seeking confirmation from Jinwoo.

"Ah~~yeah! Of course"

Jinwoo answered calmly, as if understanding.

In that moment, something irreversible seemed to be collapsing inside Mom.

**

Shortly after, a text from Mom arrived.

'I’ll do everything you ask now, Master~ Please forgive me just this once.'

Mom, using Sohee as an excuse, seemed to be declaring her submission.

Jinwoo stared blankly at the unbelievable text from Mom for a while.

'Creak! Creak! Creak!'

"Haak! Haahat! Huuuk~!"

Soon, the sound of moist rubber rubbing and pained moans emerged from Jinwoo’s smartphone.

Mom had never called Jinwoo 'Master' before...

But now, she was sending texts calling Jinwoo 'Master' and declaring her submission, following Jinwoo’s command to masturbate.

Jinwoo felt dizzy, as if electrified.

A thrill coursed through his body.

Jinwoo soon regained his composure and placed his hands on Sohee’s shoulder and buttocks.

Sohee’s body also seemed to be trembling in response to the sounds of Mom’s masturbation.

Jinwoo laid Sohee’s body down straight.

And he placed Sohee’s hand on her pussy.

The hand began to move on its own.

Jinwoo also began to shake his cock.

Creak! Creak! Creak!

Thud! Thud! Thud! Thud! Thud!

"Haauhng!" "Heh!" "Hang!" "Haaauhng~!"

The room was filled with the unrestrained lewd sounds and cries of mother and siblings.

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