Kang Cheonhu's Conspiracy VI: Losing My S-Rank Hero Sister and Childhood Friend - 22
"Heh heh heh. I'll shove the succubus essence right up your asshole."
Park Jeongcheol circled behind Song Jia-e, pressing his face so close to her ass it was practically buried in it. He extracted the succubus essence from the test tube with a syringe. The purple, gelatinous blob of essence writhed like it was alive.
"Heh heh heh. Here it comes."
"N-no! Don't! Ahhhh!"
Squuuish! Song Jia-e screamed and begged it not to happen, but with her limbs tightly bound by the restraints, she couldn't escape. Park Jeongcheol easily plunged the succubus essence into her asshole.
"Ah! Ah! Aaaah!"
(I-it's going in!)
As Park Jeongcheol pushed the succubus essence into her asshole with the syringe, it slid in smoothly, as if seeking its rightful place inside her.
"Aaaah! N-no! Stop!"
The essence felt cold and foreign, and the moment it entered her asshole, it began wriggling like a living thing. Song Jia-e shrieked at the bizarre sensation deep inside her.
"Heh heh heh. Too late now. And now, the kaijin transformation begins."
But with the succubus essence already inserted into her body via her asshole, Song Jia-e's resistance was pointless. Park Jeongcheol knew the kaijin mutation would start any second.
"Aaaah! Aaaaah! Uwaaaah!"
The succubus essence began melting into her asshole at a rapid pace, seeping into her bloodstream and infiltrating her body. Purple essence spread along the veins in her ass cheeks.
"Heh heh heh. The mutation's starting. Time to become a kaijin!"
"Kukuku. This is fun. A monster and human fusing together."
Park Jeongcheol watched Song Jia-e's transformation with perverse excitement, while Kang Cheonhu grinned in delight.
"No! No! I don't want to become a kaijin! I don't want to turn into a monster! Aaaaaah!"
Song Jia-e felt the utterly alien monster essence spreading from her asshole throughout her body. The foreign sensation in her veins was driving her mad. She could feel herself being remade into a monster.
The effects were visibly manifesting on her body. The purple liquid raced through the veins under her skin, spreading across her entire ass like a web of purple spider silk.
"Aaaaaah!"
Song Jia-e trembled in terror at the sensation of the foreign substance invading her body, transforming her into something else entirely—a monster.
Where the succubus essence spread, it brought stinging pain and a perverse pleasure like her body was melting away.
"Hah! Haaang! Hueut!"
Drip, drip, drip!
As the essence spread from her asshole to her pussy, an intense pleasure hit her like fingers teasing her folds. Love juices gushed from her pussy, sticky and clear, dripping down her thighs.
"Heh heh heh. It's succubus essence, after all—it amps up the sexual pleasure. You'll have to get used to it. You'll feel ecstasy several times more intense than a normal human body. Your whole body will become an erogenous zone. A true sex machine!"
"N-no! I don't want a body like that! Ahhh!"
The succubus essence was making her body hyper-sensitive sexually, turning her entire form into one massive erogenous zone. Song Jia-e was horrified by the declaration that she'd be remade into a sex machine, but she had no way to stop the process already underway.
The essence raced through her body, purple-veined spiderwebs covering her from head to toe. Once it had spread completely, her skin began changing to purple starting from her asshole.
This was the full kaijin transformation into a succubus—human cells fusing with monster ones, irreversible now.
"Hah... Hah... Ahuuuuk...!"
Tears streamed from Song Jia-e's eyes. As her skin turned purple, she realized her body was being remade beyond saving, plunging her into utter despair.
(Turning into a monster... Nooo!)
She was already Kang Cheonhu's sex slave, but becoming a subhuman monster was horrifying. Yet regardless of her will, the essence proliferated inside her, steadily eroding her human cells. Every tissue was becoming succubus.
"Haa... Haaa... Haaaang...."
Her sensory nerves rewired into pleasure centers, putting her in a constant state of arousal, her whole body hypersensitive.
Her lower body was fully purple now, the color creeping upward.
"Heh heh heh. It's regaining elasticity."
"Kukuku. That saggy ass is firming up again."
As the kaijin mutation progressed in her lower body, her cells fundamentally changed. Her ass, sagging from age and weight, swelled like a rubber ball being inflated, regaining its taut youthfulness. Wrinkles and flab vanished elsewhere too, cellular renewal reversing natural aging—an effect no cosmetic tech could match.
"Haat! Hak! Aaaak! M-my ass! Uuuk!"
But Song Jia-e couldn't rejoice in her restored firmness. With every cell changing, it felt like her whole body was creaking and twisting.
Crunch, crunch!
Then, a succubus tail sprouted from her ass. Flesh elongated from her tailbone, forming into a heart-tipped succubus tail.
"Kukuku. A tail's growing. This is entertaining."
"Heh heh heh. The succubus traits are manifesting in her body."
Kang Cheonhu chuckled with interest as the tail emerged. Park Jeongcheol explained it was the succubus traits taking hold.
Crunch, crunch!
"Ahuuaak! Haaaak!"
The purple skin mutation climbed to her upper body. Now, bat-like, leathery wings began sprouting from her back—pure succubus features.
"Aaaaaah!"
Crack! Craaack!
As her entire body mutated simultaneously, Song Jia-e's physical abilities skyrocketed. The restraints creaked whenever she struggled.
"Hoo. Her body's gotten incredibly strong."
"Heh heh heh. The monster essence boosts physical prowess too."
Her strength now far exceeded a normal human's. That's why Park Jeongcheol had used heavy-duty restraints from the start. Weaker ones would have snapped mid-mutation, letting her rampage free.
"Aguaaak!"
(N-no... My mind...)
With nearly her whole body transformed, the mutation finally reached her head. The monster essence eroded her brain, warping her consciousness and self.
The horror of losing herself to the erosion filled her with despair.
"Kukuku. Once the mutation finishes, she'll obey me completely, right?"
"Heh heh heh. Yes. The monster essence includes a submission factor. It erases resistance, turning her into a perfect slave."
Watching Song Jia-e complete her kaijin transformation, Kang Cheonhu chatted with Park Jeongcheol. The scientist had even engineered absolute loyalty—to Kang Cheonhu, of course.