Chapter 421 (Mom)
Translator: RaidenTL
Chapter 421 (Mom)

Si-woo pulled his smartphone out of his pants pocket.
He opened the app used to control the vibrator and cranked the intensity to the maximum.
Giaaaaaang!
The vibrator, pressed against the front of his mother’s groin, let out a thunderous roar as it began to vibrate violently.
The intense tremors were transmitted directly to Si-woo’s penis, which was currently buried inside her, along with the frantic tightening of her vaginal walls.
The vibrator’s power was so immense it felt as if it were rattling her very brain.
"Ha-aaaah... Hwa-aaat... Hnghh! Hnnngh!"
Faced with an intensity she hadn't anticipated, his mother’s knees buckled involuntarily. Her posture began to crumble as if she were about to collapse.
As the vibration hit its peak, she curled her body forward as if she’d been struck in the abdomen, letting out moans that bordered on shrill screams.
"Keep your legs strong! You fucking pussy bitch! Straighten those knees!"
Si-woo barked the order at her, his voice dripping with overbearing authority.
Smack!
The moment he finished speaking, he delivered a sharp blow to her buttocks.
"H-ahhh!"
She let out a pained groan and desperately tried to fix her collapsing posture.
However, she seemed unable to find any strength; her legs, pressed close together, wobbled like those of a newborn fawn.
Si-woo wrapped both arms around her pelvis, just below her waist, supporting her as if lifting her up.
Only then was she able to straighten her knees and barely maintain a proper stance.
Leaning on the table and relying on Si-woo’s arms for support, her entire body was trembling uncontrollably.
Beads of cold sweat broke out across every inch of her skin as she struggled to endure the vibrator’s assault.
Si-woo slid the hand that had been supporting her pelvis slightly lower, searching for the vibrator pressed against her clitoris.
Grrrrrrr!
The moment his fingernail brushed against the device, it emitted a low, threatening sound, like the growl of a beast.
"Hngh!"
His mother’s body jolted as if startled by the sudden sound and sensation.
Si-woo quickly leaned forward, using his chin to pin her back down.
Then, having located the vibrator with his nails, he covered it with his palm and pressed down hard.
Zwaaaaang! Zwaaaaang! Zwaaaaang!
As he crushed his palm against her groin, the muffled, pressurized vibration roared between her thighs as if it were trying to break free.
"H-nghhhh! Ha-aaaah! Hnnngh~!"
His mother writhed her upper body beneath him, moaning in sync with the vibrations crushing her clitoris.
Si-woo moved the vibrator back and forth relentlessly, as if he were determined to grind her clitoris into nothing.
"Ha-ah... Hngh... Mas... Master... No... No more... Master! H-ugh... Ha-ah, ha-aaah!"
She squeezed her pussy hole as if trying to wring the life out of Si-woo’s penis, her voice sounding like a desperate plea.
"Why? You want to just pass out here as easily as you do at home?! You think I’ll go easy on you just because you’re acting pathetic?!"
Si-woo spoke while pressing the vibrator even more obsessively against her clitoris.
"H-ah, ha-ah... Mas... Master... Si-woo... Master~! Hnnngh.... Master~! H-ugh! Hnghh, ha-aaaaah!"
She called out to him desperately, her breath hitching as if she were on the verge of a breakdown.
Her sobbing made it feel as though she had reached her limit and was declaring her surrender.
Through the spasms and the frantic tightening of the walls surrounding his penis, she was signaling to Si-woo that she had already reached several intense orgasms.
But Si-woo had no intention of stopping his violation.
"I told you to stop calling me, you fucking bitch! You better not give up now! If you do, I’ll revoke that rank I just gave you alongside Se-hee and treat you worse than the family dog."
Si-woo shouted at her threateningly, bringing up Se-hee Noona’s name and the hierarchy they had just established.
"I... I really... don't think I can take it... like this... H-ugh... It's... it's too strong...! H-ah! Si-woo~! Si-woo! Hnnngh, h-ugh!"
Tap! Tap! Tap!
Finally, as if momentarily forgetting they were engaged in master-slave play, she began to tap frantically on the arm Si-woo had wrapped around her pelvis, begging him for mercy.
A satisfied smile spread across Si-woo’s face.
While still leaning over and pinning her down, he straightened his back and brought his lips close to her ear.
He slightly loosened the pressure of the hand holding the vibrator.
"Mom! If you really can't stand it anymore, just say 'Save me.' From now on, that’s going to be our family 'safe word,' okay?"
Si-woo spoke calmly, his voice a whisper as if they were sharing sweet nothings.
Her body shivered, reacting to the soft, whispering tone.
"H-ah... Ha-aaa... Hnnngh... Yes..."
She let out a moan that sounded like she understood his instructions.
After speaking, Si-woo once again applied force to the vibrator, crushing it against her clitoris.
Perhaps it was the hope that she could be released at any time by her own will, or perhaps she had gained some psychological stability from understanding the safe word, but her violent trembling and thrashing seemed to subside slightly compared to before.
"Sa... Save..."
In that state, she was already struggling to open her mouth to pronounce the safe word Si-woo had just taught her.
Si-woo lifted his torso and moved his lips to her other ear, speaking as if to block the words from leaving her mouth.
"But if I think you’re saying 'save me' when you could have actually held on, there will be absolutely no mercy after that. You decide, you fucking bitch!"
Maintaining that same whispering tone, he switched to the other ear to deliver a warning filled with degradation and profanity.
"Hnghh!"
Her body stiffened instantly just as she was about to spit out the safe word.
Her pussy hole tightened around Si-woo’s penis with enough force to snap it.
A different kind of resonance and trembling, distinct from the maximum-level vibration of the device, was being generated deep within her cave.
Even though there was a way to escape this torture of extreme pleasure, she hesitated, unable to be certain of her own limits.
Leaving the hand pressing against her pussy where it was, Si-woo placed his other hand on her buttock and straightened his back.
He looked down at her with a look of contempt as she struggled to endure.
"Look at this! You could have held on, but you were just going to say it, weren't you? You fucking piece of shit!"
Si-woo spoke harshly, pointing out the deceptive attitude she had shown within their master-slave play.
He spread the hand on her buttock wide, stroking it gently before raising it into the air.
Crack!
Si-woo’s palm sliced through the air and landed hard on her buttock.
"H-aaaaah!"
She curled her body and let out a pained scream at the powerful spanking.
Crack! Crack! Crack!
Si-woo continued the merciless spanking, alternating between both cheeks to keep things balanced.
"H-ah! H-ngh! Ha-aaat!"
Her moans were now closer to full-blown screams.
Si-woo took the hand that had been crushing the vibrator against her groin and moved it forward.
He grabbed her arm, which had been supporting her on the table, and pulled it toward her groin where the vibrator was attached.
He forced her own hand to cover the vibrator, just as he had been doing moments ago.
Then, he pressed her hand down hard against her own groin.
Zwaaaaaang!
The vibrator, now crushed between her hand and her groin, let out another wild, roaring vibration.
The tremors were violent enough for Si-woo to feel them clearly through his penis.
"I can feel the vibrator rattling my cock, too. Just try letting your hand go limp!"
He barked at her again, slowly withdrawing his hand from on top of hers.
Even after he pulled away, she kept the pressure on the vibrator.
"H-ah! H-nghh... H-aaaaah!"
Exhausted, she buried her face against the table, gasping for air.
Her large, well-shaped buttocks, swollen and red like a pair of rising moons, were thrust toward him.
Si-woo extended a finger toward her inflamed skin.
As if playing a game, he began to trace letters onto her buttocks with his fingertip.
[Mom], [Pussy], [Se-young], [Sex], [Pregnancy]
He wrote out the two-syllable words as they came to mind, alternating between her left and right cheeks, listing them one by one.
White lines appeared on her flushed flesh as the letters were etched in.
With every completed word, she flinched, letting out a breath that seemed laden with complex emotions.
Once he finished writing, Si-woo wrapped both hands around her waist.
He pulled his hips back before slamming his penis into her pussy hole with all his might.
Splat!
Si-woo drove his penis deep into the back of her pussy and held it there.
