Lovers' Common Sense
"Senpai, you and I are lovers, right?"
"Uh, yeah? That's right, isn't it?"
Seolrin felt a flicker of wrongness at the answer that had slipped out of her own mouth, but Sirin's reality distortion papered over that feeling with ease.
Lee Sirin curled the corners of her mouth into a smile.
Sure, she'd gotten thoroughly beaten down by Seolrin's hidden true self yesterday, but this defenseless, adorable female standing right in front of her was still firmly in the palm of her hand—or so she thought.
As long as her true self doesn't come out, senpai is my darling… my darling lover!
Sirin reached out and slid her fingers deep between Seolrin's, interlacing them, and closed the distance between their bodies in one smooth motion.
"Ah… why are you grabbing my hand all of a sudden?"
"Lovers hold hands. It's just common sense."
"…Right. I suppose it is."
Seolrin's cheeks flushed a faint pink.
My senpai with a blush on her face is so cute!
As the two of them walked down the corridor, sweat began to pool between their pressed palms, thick with a tepid warmth.
Sirin gently steered Seolrin's footsteps toward an empty materials storage room tucked into the corner of the hallway.
"Let's take a quick break!"
"Huh? I'm fine, though."
"Get in, hurry!"
Before Seolrin could even put up a resistance, Lee Sirin tugged her by the wrist and slipped into the pitch-dark storage room with her.
Click.
Locked.
The storage room's lights were off, plunging the interior into near-total darkness, but the faint glow leaking through the tiny window in the door was enough to make out shapes.
Sirin pressed Seolrin up against the wall and pushed her chest firmly against Seolrin's own.
"…Sirin. Doing this at work, out of nowhere—"
"Yap!"
Sirin popped a finger into Seolrin's mouth, gagging her.
Slurp.
Seolrin started licking the finger on her own, without even being taught—and watching that lewd talent on display, Sirin marveled inwardly.
Senpai, are you actually a genius or something?!
Perhaps because of the darkness, Sirin's blue eyes and her star-shaped pupils glittered all the more brightly.
The shampoo scent unique to women in their twenties, rising from both Sirin's and Seolrin's bodies, gradually began to fill the room.
Sirin used a strawberry-scented shampoo; Seolrin used a plain, fragrance-free one.
And yet, somehow, the scent drifting off Seolrin's body was far stronger than the one coming off Sirin's.
Nom, schlop… mwah… pop.
The finger Sirin had stuffed into Seolrin's mouth slid free, and their lips crashed together almost immediately after.
Mmm….
"Hahh…."
Whether it was the right adjective to use in a situation like this was anyone's guess, but a moan that could only be described as intimate spilled from between Seolrin's lips.
Sirin's tongue glided across the row of Seolrin's teeth like a virtuoso performance, then burrowed deep into the hollow behind them.
And Seolrin, offering no resistance to that wandering tongue, naturally parted her jaw to widen the gap and cleared an open road for Sirin's tongue to venture deeper.
Seolrin's brain already recognized Sirin as her lover, and so she was accepting Sirin's kiss as the most natural, most pleasant expression of affection there was.
Sirin's hands peeled Seolrin's coat off and dropped it to the floor with a soft thump, then rolled the hem of her knit sweater up over her chest, baring the heavy breasts cradled in a black bra.
Sirin hauled the bra cups down with her hands, letting Seolrin's nipples meet the cold air—and it took hardly any time at all for the air-kissed buds to stiffen.
Schlop, suuuck….
What happened next was obvious, wasn't it? There were breasts and nipples here, so, well—somebody had to suck them.
"Ngh, Sirin… ahhn, my chest, don't… don't suck so hard…!"
Seolrin was lying through her teeth. It was a sentence with two meanings—her lower mouth was telling the truth, and her upper mouth was telling a lie.
Seolrin gripped Sirin's blonde hair tight, bowed her head deep, and nibbled at her lower lip in tiny, quivering bites.
Every time her nipple was softly chewed inside the heat of Sirin's mouth, fresh arousal secreted from Seolrin's lower belly came sliding down the slick slide of her sex in a gushing rush.
Sirin laid Seolrin down on the large sofa sitting in the corner of the storage room. Why a sofa was being stored here in the first place is not important.
She popped the button of Seolrin's jeans, dragged the zipper down, pushed the panties—soaked through and utterly drenched with arousal—to one side, and exposed a reddened, swollen, glistening vulva.
"…A-are we really doing it here?"
"You seduced me first, senpai."
"I-I did?"
Before Seolrin could mount a proper rebuttal to that nonsense, Sirin spread the damp folds of her labia apart and licked at the gaping entrance of her vagina and the puffy, achingly swollen clitoris.
In a relationship between human beings—especially between two women in a same-sex couple—nothing matters more than fingers.
There was even a school of thought that held the giddy, butterflies-in-your-stomach atmosphere of a couple who'd just started dating—where a mere brush of the fingertips was enough to set you smiling—was what constituted true, orthodox yuri.
Sirin had fingers too, and she adored that fresh-faced atmosphere. So why was it that, the moment things turned physical, both she and Seolrin kept obsessively resorting to tongues and lips and mouths?
The reason was simple. Sirin's essence was an anomaly, and Seolrin's essence was a mutant.
For creatures like these, innocence suited them far less than a good, filthy screwing did.
Those influenced by the Black Gate frequently developed an obsession with—or a deep, intrinsic connection to—the very concept of consumption, and that is precisely why their coupling so often resembled a pair of dogs in heat.
Lick.
Sunlight lapped vividly at the leaves of a tree.
"Ahhn…."
Hips bucking, tongue rubbing, flicking—and with every repetition of the act, one crude, plaintive cry after another burst from her mouth.
Sirin thrust her tongue in and began widening the tight little square footage of that narrow vaginal entrance as if she were driving down the property value.
Hah….
Squelch, squelch….
Having withdrawn her mouth and tongue, Sirin immediately moved two fingers—her middle and ring—into residence inside Seolrin's vagina to survey the floor plan.
—At some point, the two of them were completely naked. Why?
"It feels so good… I love you, I really, truly love you…."
Because Sirin's distortion had rewritten Seolrin into regarding her as her most precious lover, Seolrin was surrendering body and soul entirely to the pleasure this insolent anomaly was giving her.
Every time Sirin's fingers pressed hard against the sensitive spot on her inner walls, Seolrin's legs clamped around Sirin's waist—tight, with tremendous force.
Even as the obscene squelching mingled with the moans to build into one great chorus, there was no one to peer in at the soundproof-sealed storage room.
After all, this particular storage room of this particular containment facility had been fitted with special measures to keep its various contents safe and sound.
Measures that completely sealed off the inside from the outside? Those were so common that even the abandoned corner storage rooms had them.
"Mm, mm, mmhh…! I-I'm coming…! Sirin…!"
"Me too, I'm coming too…!"
In truth, Sirin experienced no orgasm whatsoever.
She was simply savoring, on a purely mental level, the fact that right now she owned and dominated Seolrin completely.
Seolrin's vagina clamped down and sucked at Sirin's fingers as if they were a cock (a device that would never, ever get to enter it), and jet refined arousal from deep within her walls like a fountain, soaking Sirin's hand, her clothes, her body, and the entire sofa.
At this rate, Seolrin was liable to collapse from dehydration.
Her eyes, shaken loose by pleasure, rolled back to show the whites like a magnitude 7.0 earthquake had hit them, and the muscles of her thighs trembled violently, throwing one thick cord of tendon into sharp relief.

Sirin sensed Seolrin's climax and moved her mouth to her chest. She sucked a nipple into her mouth while her other hand kept working between her legs.
The peak of climax.
Whirrr, whirrr, whirrr.
Creak, creak, creak.
The Black Cube slid out of Seolrin's pocket of its own accord and began spinning rapidly.
At the same moment, Sirin's counterfeit common sense that had been filling Seolrin's brain went pop—burst like a bubble.
Absolute Reality Correction.
The pleasure-hazed glaze over Seolrin's eyes faded, and her true self showed through.
"Th-this is inside the facility… why…?"
"Huh…?"
Sirin, flustered, went tumbling across the storage room floor in a clatter, her body still glistening wet.
Seolrin's true self curled her lips into a smirk and sneered down at her. Now then—what was about to begin?
"Why…?"
"You… you don't even know your own power's time limit, do you? Its ceiling? Well, you've never had an opponent who could push you to it."
"……."
"It shows all over you—never once fought anyone in your own weight class."
Seolrin seized Sirin by the nape of the neck and yanked her roughly toward her. It was time for a change of possession.
"Senpai… ugh…."
"How much longer am I supposed to put up with your little games?"
"L-let go of me, please…."
"You were having the time of your life violating my body just a minute ago, and now you're a little scared? Shall I break that fake body of yours into pieces?"
Seolrin's true self rose from the sofa, reinforced the strength in her arm, and hoisted Sirin up by the throat, dangling her in midair.
With her throat suspended, the rest of Sirin's body naturally floated up as well. Her neck stretched out slightly downward, her body swaying back and forth on the tether.
A body drained of all strength.
The Cube was controlling Sirin's flesh.
"……."
"My turn now, isn't it?"
"Ahhn, senpai, wait—!"
Seolrin drove two fingers deep into the place beneath Sirin.
With a squelching sound, arousal came spilling out in a rush.
Sirin's body and name were modeled directly after Seolrin's own body and name, and the parts relating to erogenous sensitivity had been replicated with suspicious, meticulous detail.
In other words—as pathetic as Seolrin was, Sirin was exactly as pathetic.
And why is it that Seolrin can manifest her true self inside the facility? That has something to do with a certain special measure the Facility Director took.