15. It's Called Switching Sides, Sirin.
Heheh….
Sirin affected an air of composure on the outside, but inside she was wound tight as a spring.
The thing wearing Seolrin's face began to speak, its eyes cracked open into a thin, knowing slit.
"You were wondering why the Facility Director summoned me, weren't you? It wasn't the leisurely small talk you're imagining. The Director split his skull open for the first time in ages."
"…Split his skull open?"
"You know how it is. Almost everyone in this facility—the Director, the Team Leaders, the researchers—is a mutant. So even if the Director's head cleaved in half and his true body crawled out, would that really be so strange?"
"……."
"Ever since you arrived, this facility's rules have been coming apart at the seams. The standards I set began to warp, and thanks to that… here I am. Honestly, it's my first outing in a long while, so I ought to thank you."
Seolrin flicked the black cube floating in midair with her fingertip.
An ability even she herself didn't know she possessed.
Her mutant power: Absolute Reality Correction.
The power to fix in place, as an inevitability of reality, any situation she believed to be common-sensical and ordinary.
No matter how dangerous an entity might be, within her field of vision, around her body, it became bound and shackled to comparatively mundane laws.
A power on par with the authority of Sirin's true self.
The facility as a whole, unable to designate her as a dangerous mutant it couldn't control, had instead approached her true personality for cooperation and assigned her the role of an ordinary researcher.
In other words, it used her power to park extremely dangerous anomalies, entities, relics, and mutants around her and keep them contained.
Seolrin could not bear the weight of her own memories, her original personality, her power—and she had realized that if she ever came to understand it, the activation condition of her ability would collapse.
The reason was simple.
Her ability made any situation she herself deemed common sense come to pass, without fail.
And the common sense of a powerless, ordinary researcher exerted a far stronger binding force than the common sense of a mutant…!
"I see. So the reason my power didn't work on you wasn't your mental fortitude, Senior—it was that your ability was competing against mine?"
"Exactly. It seems you've never once met anyone on your own level, have you? You've always had your fun kneading around inside other people's heads."
"Hah… a mere fragment of a fake senior sealed inside the Cube…!"
"Don't be absurd. I'm the real deal. Not a split personality, not a fragment—I'm simply the true body. Think of it like your tentacles and your body being separate things."
Whirr, whirr, whirr.
The black cube began to spin like mad.
Nine black blocks started rotating in different directions, at different speeds.
'…What is this?'
Sirin realized she had forgotten to beat her heart. Then she realized she had forgotten to breathe. Then she realized she had forgotten to think. Then she realized she had forgotten to sustain her own existence….
"Hah. It's called switching sides."
Seolrin slowly moved her body toward Sirin on the bed. She was smiling.
Just as Sirin had smiled down at Seolrin, so now Seolrin smiled down at Sirin.
"I like you, you know."
Seolrin took Sirin's chin in her hand and lifted it. And then… she assaulted her lips.

Mmh, chuu…!
Rougher than the kiss Sirin had given her, denser, more relentless….
Seolrin's tongue pried apart Sirin's parted teeth, slipped inside, coiled around the soft tongue within, and squeezed tight.
The sweet, fruity saliva pooled in Sirin's mouth slid down Seolrin's throat, while from the opposite direction Seolrin's breath and tongue flooded into Sirin's.
"Nn, ngh… hah…."
Their lips finally parted, a translucent strand of drool stretching long between the two of them before dropping with a soft plop onto Sirin's chest.
Lee Sirin's star-shaped eyes, their movement arrested, trembled helplessly from side to side.
Seolrin toyed with Sirin's lips with her fingers, then moved her hand lower and tore away the pajama bottoms.
Pale white shoulders and the slender line of her neck came into view.
"…Looks delicious."
Seolrin stroked the nape of Sirin's neck, then ventured further inward, toward the smooth hollow of her armpit.
Seolrin's hand made contact with the sleek, hidden skin of her underarm.
Moving her other hand, Seolrin slipped off Sirin's pajama top and extended her tongue toward the armpit.
A slow lick, a wet drag. Each time that tongue swept upward, Sirin's whole body shuddered.
The flat of her tongue pressed down lightly, lifted away, pressed down again—teasing Sirin's nerves higher and higher.
Always the one to violate others, now she lay utterly dominated….
Reeling from this unfamiliar stimulus, Sirin's mind trembled and quaked.
Tok.
One cube fragment stopped rotating.
"It's fine to make noise, you know."
"Hah… senior… nn…."
"This scene will linger in your faint memories and your subconscious, won't it? Heheh. I can't wait to see how I react when I wake up tomorrow morning."
"Ah, aahn…."
Seolrin seized Sirin's breast with a firm grip.
Pressing hard into the heavy swell of flesh through the fabric of her underwear, she kneaded the nipple relentlessly through the bra.
Then Seolrin trailed down along the valley of Sirin's chest.
Her instrument was her lips.
Chu, chuuup….
She pushed the naturally loosened bra aside, pressed her mouth to one rounded dumpling of flesh, and swallowed the stiffened nipple whole.
Chuuuup….
Sirin's star-shaped pupils contracted from a light climax.
"Oh… it moves? Like a normal pupil?"
"Haaahn, aah…!"
Drowning in pleasure, Sirin couldn't answer.
That was the price of modeling a human body far too meticulously.
She'd implemented not a single pain receptor, unnecessary sense, organ, viscera, drop of blood or vessel—and yet the one thing she'd built to an exquisitely fine standard was her sensitivity.
Why? Obviously, so she could devour Seolrin.
She just never imagined she'd be the one getting devoured.
Seolrin did not stop. She kept licking around Sirin's navel, descending steadily lower.
At last, Seolrin pulled down Sirin's pants.
Her soaked panties revealed themselves!
Sirin's body had already responded to Seolrin's caresses, leaking slick honey down her thighs like a bedwetter.
Seolrin nudged the panties aside and laid her palm flat over Sirin's glistening pussy.
"Your lips down here are rather warm, aren't they?"
With her other palm she pressed down firmly on Sirin's lower belly, around her womb, circling as if massaging.
She was deploying the weaknesses she'd mapped out of Sirin back at the massage table!
The moment her womb took direct pressure, Sirin's eyes rolled back, and then Seolrin's other hand spread her pussy wide and began to rub the sensitively swollen folds of flesh.
Squelch, squelch, squelch….
"Aaahn…! Senior…! Aah!"
Seolrin bowed her head and pressed her lips directly, chuu, against the dripping, moisture-drenched pussy smeared with honey.
She thrust out her whole tongue and licked broadly up the slippery folds, then targeted the clitoris with ruthless precision.
With the illusion that her entire pussy had been swallowed into Seolrin's mouth, Sirin's brain underwent a dopamine detonation and began going blank in real time.
Please refrain from the cheap remark that she was always blank to begin with.
"Aahn…! I'm cumming! C-cumming! Sirin's cumming…!"
Fwoosh, fwoosh!
Honey burst from Sirin's pussy like a fountain, soaking Seolrin's lips and face.
Her joints still immobilized, Sirin's inner muscles convulsed like mad—finally, the climax.
Seolrin drank down every last drop of the liquid flowing from Sirin's pussy, glug, glug, then wiped her mouth with the back of her hand and flashed a bashful, indecent smile.
"Such a delicious body you have, Junior."
Sirin, still awash in the afterglow of pleasure, could only stare up through hazy eyes at Seolrin gazing down at her.
A total, perfect defeat.
***
The next morning.
The angle of the sunlight pouring through the window was so lethal that my eyes snapped open.
"Hnnggh…!"
My head throbbed.
My whole body ached, and my crotch was damp.
I tried to push myself up from the sofa, but feeling a heavy weight around my lower belly, I looked down.
Lee Sirin—that lunatic—was lying there in what could only be described as a loose reverse triangle choke clamped between my thighs, staring blankly at the ceiling.
"You… why are you doing that down there?!"
"Senior… Senior scared me…."
"Are you even lucid right now?!"
Lee Sirin's star pupils had lost focus and stopped sparkling, and her body kept trembling with fine, incessant convulsions.
I tried to figure out what on earth had happened, but my brain, refusing to accept the situation, slammed its red self-destruct button and attempted discharge.
Ha….
I glanced down at my pants.
'Ah.'
I'd apparently had some kind of dirty dream—the stains were plain to see. Sticky, half-dried honey and body fluids near my crotch and the insides of my thighs.
If I didn't wash up soon, there'd be a strange smell….
I rubbed away the white traces roughly with my fingers, shoved Sirin aside, and kept wiping with tissues.
Emergency first aid so I could wash up and get to work.
I brushed myself off and stood.
Sirin, still processing whatever the hell had happened to her yesterday, could only stare blankly at the ceiling, panting out strange moans—hah, hah.
"If you don't get up, I'm leaving without you?"
"Yeees…."
With that drained reply, I began getting ready for work.
Something was caught between my teeth.
A yellow hair?
"What is this?"
"What's wrong…? Senior…?"
Hearing me mutter to myself, Sirin stirred on the bed.
"Nothing, it just feels like your hair's stuck in my teeth."
"WHAT?! I always keep it perfectly groomed?!"
"Huh?"
"I-I meant my hair!"
What kind of nonsense is that.
Forget it—time for work.