Chapter 401 (Mom)
Translator: RaidenTL
Chapter 401 (Mom)

Inside the small karaoke room, Mom’s soaking wet buttocks and lower groin were exposed.
Her body trembled violently as if she were overcome with shame.
Yet, Mom continued to sing along to the accompaniment of the karaoke machine, pretending not to notice what was happening.
Her eyes were squeezed shut, as if she were trying to shut out reality itself.
Click, click, click!
Like a forensic investigator recording evidence at a crime scene, Si-woo captured photos of her buttocks, which were partially obscured by the hem of her skirt wedged between her cheeks.
Si-woo placed a hand on Mom’s thigh, spread her legs slightly, and slid his smartphone underneath to take photos from below.
Click, click, click!
Seeing Mom’s bare groin captured on the smartphone screen, Si-woo realized there was no longer any reason to hesitate.
He let go of the hem of the oversized T-shirt he had been holding up.
The hem fell back down, covering her thighs and the lower part of her buttocks while remaining wedged deep between her cheeks.
Standing right there, Si-woo placed his palm against Mom’s buttocks as she continued to sing.
His hand covered her plump backside.
Mom didn't try to stop his hand, nor did she stop the song she was singing.
Si-woo stroked her buttocks up and down, savoring the sensation.
Occasionally, Mom would crack her eyes open just a sliver to check the situation outside the glass door, only to squeeze them shut again, her body twitching as if she were overwhelmed by excitement.
Unlike when he had seen her in front of the mart, her submissive gestures and attitude made Si-woo’s cock swell even further.
* * *
The first song Mom was singing was already nearing its end.
As the accompaniment began to fade, Si-woo slowly pulled his hand away from her buttocks.
He set down his smartphone and reached into his crossbody bag, pulling out a waterproof bandage and a wireless vibrator.
He placed the tools carefully on the table in front of them.
It was as if he were a doctor gauging a patient’s intent before using dangerous medical instruments...
A fanfare erupted from the karaoke machine, and Mom’s score appeared in large numbers on the screen.
After the voice of a female announcer praised the high score, the room fell into a brief silence.
Had Mom recognized the vibrator and the waterproof bandage Si-woo had laid out?
The sound of Mom’s ragged breathing caught in the echo-heavy karaoke microphone, ringing through the quiet room.
Startled by the sound of her own breath amplified through the speakers, Mom quickly pulled the microphone away from her mouth.
Standing there with her shoulders heaving as if she were out of breath, Mom picked up the beer can from the table and drained the last of its contents.
Gulp, gulp, gulp.
"You should eat some pizza with that! I went through the trouble of heating it up. Want me to get you another beer?"
Si-woo, who had been molesting her buttocks just moments ago, spoke to her with feigned innocence.
"Huh? Oh... okay..."
Mom answered reflexively, sounding flustered.
Si-woo made a loud rustling noise as he rummaged through the shopping basket before pulling out another can of beer for her.
Cr-ack!
He popped the tab with a refreshing sound and set it on the table.
He deliberately placed the beer a little further away from the vibrator, right where Mom was standing.
Mom looked at the beer and let out another hot, stifled breath.
The accompaniment for the second song Mom had reserved began to play from the machine.
It was another popular song from when Mom was young.
The track featured a cheerful rhythm and melody contrasted with mournful lyrics.
It seemed to be a song about a tragic, unrequited love.
A love song about age, the future, and living in different worlds—themes that seemed quite cliché by today's standards.
As if telling the lyrics to go to hell, Si-woo placed his hand back on Mom’s buttocks as the accompaniment started.
He felt the pleasant, soft squish of her backside against his entire palm.
As soon as the music started and Si-woo’s hand made contact, Mom’s buttocks tensed up again in surprise.
While the intro played, Si-woo stroked both sides of her buttocks in time with the beat.
As the intro neared its end, he tapped her buttocks as if counting down with the finger icons on the monitor.
Tap! Tap! Ta-ap! Slap!
As if punishing her for bringing her son to a place like this under the pretext of having something to talk about, only to do nothing but sing, the final strike was quite sharp.
"Haa-ah!"
Mom’s singing voice wavered as a moan escaped her lips.
The hem of the T-shirt that had been wedged between her cheeks slipped out from the force of Si-woo’s strike.
Si-woo curled his fingertips and shoved the fabric back between her cheeks.
His fingers sank deep, forcing the T-shirt back into the crevice of her buttocks.
Using his middle finger, he searched for Mom’s anus through the fabric.
Soon, he felt her external anal sphincter, which felt like a rubber ring, scraping against his fingernail.
Mom’s body jolted violently as the sensitive area was stimulated.
Wiggling his finger up and down, Si-woo forced the T-shirt into her back hole.
About half a knuckle’s length of his finger, along with the fabric, was wedged into Mom’s anus.
Mom’s sphincter tightened, and her singing stopped as she gasped for air.
As if trying to penetrate her anus completely, Si-woo pushed his finger in as hard as he could along with the T-shirt fabric.
"Hag-h-hh!"
Mom’s pained groan echoed through the microphone.
More than two knuckles of Si-woo’s middle finger dug into her shameful hole.
Mom’s buttock muscles and flesh stiffened and trembled as if an electric current were running through them.
Si-woo skillfully and gently rotated his finger before pulling it out of her anus.
Only the T-shirt fabric remained, tightly packed and deeply wedged inside her.
After withdrawing his finger, Si-woo pressed down on the fabric around her buttocks, packing it in like he was firming up the ground in a valley.
Looking at Mom’s tensed buttocks and the firmly wedged fabric, Si-woo figured that no matter how hard he spanked her now, the clothes wouldn't slip out of her anus.
When Si-woo removed his hand and began stroking her buttocks again, she resumed her singing.
Whatever she was thinking, Mom still seemed to have no intention of stopping Si-woo’s harassment or even acknowledging it.
The thin, delicate trembling of her voice seemed to perfectly express her tense, fluttering heart.
Satisfied with the T-shirt now securely wedged in Mom’s anus, Si-woo stroked her backside with a smirk.
He then began to trace letters on her buttocks with his finger.
‘Seon-mi’
He slowly traced the strokes, writing one character of Mom’s name on each cheek.
‘Whore’ ‘Hole’
Next, he carved those words, alternating between the left and right cheeks.
Did Mom understand the words he was writing?
Her breathing grew heavier and heavier as she sang.
Despite the upbeat tempo of the song, the lyrics leaked out like a sob, clashing with the melody.
The sound of Mom’s singing only served to further fuel Si-woo’s excitement.
* * *
Though she was clearly uncomfortable, at some point, it seemed as though Mom had lost the will to resist Si-woo.
Si-woo figured that even if someone saw them through the glass door, it wouldn't be easy for an outsider to perceive or understand the shameless game he and Mom were playing.
Si-woo decided it was time to begin molesting Mom in earnest.
He shifted his position slightly to stand directly behind her.
From this spot, he had a direct view of Mom’s ridiculous backside, with her clothes wedged deep into her rear.
Si-woo grabbed Mom’s hips and pulled her closer to him.
Mom’s body was pulled toward where he was sitting with almost no resistance.
Si-woo slid his hands down from her hips.
His hands passed over Mom’s fleshy buttocks, kneading them as they went.
His hands moved past the T-shirt covering her body and reached the bare skin of her thighs.
He slid his hands along her smooth thighs toward the inside.
Si-woo’s hand came away slick with Mom’s lubricant.
The transparent fluid was soaking her inner thighs and running down past her knees.
Looking closely, he saw that her arousal had trickled down her calves all the way to her ankles, reflecting the colorful, flashing lights of the karaoke room.
Si-woo’s penis was now straining against his pants and the front of his shirt, desperate for liberation as if it were about to tear through the fabric at any moment.