Sexual Processing by Pussy Play, and the Record
Chaerin, both hands sticky with my cum, tried to rise from the mattress with a flushed face.
She was probably heading for the bathroom to rinse the semen off.
But I still wanted to finger her pussy, so before she could get up I caught her wrist and laid her back down.
"Wait."
"Why?"
"It's not over yet."
"What isn't?"
Chaerin glanced down at my cock with a look that clearly said, Don't tell me you want more sexual processing already?
"Thinking about it, it's unfair if only I get sexual processing."
I spoke while looking straight into her eyes.
"This time I'll give you sexual processing."
The moment the words left my mouth I cupped her face in both hands and kissed her.
This was the first kiss between me and my twin little sister.
"Mmph…!?"
Chaerin' s eyes flew wide in disbelief.
I felt her soft, plump lips stiffen with shock.
As if she had forgotten how to breathe, she surrendered her body to me like a doll.
Her flustered pupils trembled.
If not for the cum still coating her hands, it would have been a thrilling scene straight out of a romance movie.
She tried to speak, but every time she opened her mouth mine sealed it again.
"Mmph, chuu, hey, wait, haah, smooch…."
I wasn't especially skilled at kissing either.
But the sensation of the heated kiss I had shared earlier today with my homeroom teacher, Iseol-noona, was still vivid on the tip of my tongue.
Recalling that memory, I gently rubbed the tip of my tongue between Chaerin's tightly closed lips.
When I licked upward as if lightly tickling her, the strength drained from her shoulders.
A tiny gap formed between her lips.
I didn't miss the chance and pushed my tongue inside.
"Nngh chuu, kiss… it's my first time… mmm, churu…."
While our tongues tangled, Chaerin's mouth—shy because it was her first—tasted sweetly of strawberries.
When I carefully swept the soft flesh inside with my tongue, she twisted her waist.
A helpless little gesture against the foreign sensation she was feeling for the first time.
But she never pushed me away; she clearly didn't dislike my tongue.
So I found her small tongue and wrapped it with mine.
Her tongue kept wriggling as if the contact felt awkward, yet I refused to let go and intertwined them thoroughly.
My hands had already drifted back to her breasts.
No man could look at Chaerin's F-cup tits and not get hard.
When I put strength into my fingers, the soft mounds of flesh kneaded at my whim just as they had before.
"Nngh…."
With her lips sealed, a faint moan slipped from her throat.
Kissing and breast play at once. The double stimulation seemed to be scrambling her thoughts.
Wearing a satisfied smile, I slowly slid the right hand that had been kneading her chest downward.
Past her smooth waist I stroked the slender line of her hips.
The lower my hand traveled, the more lewdly her thighs rubbed against each other.
When my hand finally slipped inside her pants and panties, that sexy body flinched hard once more.
I paid no attention and pushed deeper.
The warm heat inside her panties transferred straight to my palm.
"Chuu, hoob, there…!"
It was incredible.
Her panties were already past damp—they were soaked through.
Sticky love juices coated my fingers thickly.
And beneath that, the soft feel of neatly trimmed short hair.
Of course I didn't hesitate; I slid a finger into her pussy.
When I carefully pushed inside, hot, soft flesh wrapped around me.
It was tight.
Moreover the walls writhed like a living creature and squeezed my finger.
If I ever had sex with a pussy like this I wouldn't last three minutes before cumming.
-Squelch!
The sound was louder than I expected.
The wet, explicit noise of a finger being shoved into a tight, dripping place.
With only the two of us in the room it rang out especially clear.
I felt precum surge up from my own cock.
Chaerin hastily tore her lips from mine and panted as she spoke.

"H-ha, don't… Sihyuk…."
Despite the words, anyone could see she wanted me to keep going.
Her voice thick with heat was so sweet I wanted to kiss her just from hearing it, and her face burned red as if she had a fever.
Her eyes were steeped in anticipation.
I grinned and stole her lips again.
This time the kiss was far deeper and thicker.
While my tongue ravaged the inside of her mouth, the finger below began stirring her pussy in earnest.
At first, unsure what would work best, I only inserted shallowly and wiggled.
But matching the flinching reactions of her body I gradually changed my movements.
The finger that had been poking aimlessly began rubbing the vaginal walls as if tracing them with my fingerprint.
"Heup… nngh…!"
-Squelch squelch squelch
The wet sounds never stopped.
I wanted to find her most sensitive spot.
So I bent my finger and slowly scraped upward along the inner wall.
All the while I never broke the kiss, diligently locking eyes with her and moving my tongue.
Her hands still sticky with cum, Chaerin could neither grab me nor clutch the mattress; only her thighs trembled.
Not long after I started probing for her weak points the reaction arrived.
"Heut, there, there…!"
Found it. This was the spot.
I pressed hard with my fingertip so I wouldn't forget it.
Her breathing grew even rougher.
I gently rubbed in slow circles centered on that place.
But something felt off.
When I pulled out a little and gently rubbed the lower wall instead, she twisted even harder.
"Ah, ang…! There feels weird too…"
What? Two weak spots? Curious, I tried other places as well.
This time the left side.
"Hiiik! W-wait, if you do it like that…!"
Her body began trembling as if it had lost all control.
It wasn't that one place was especially weak. Her entire pussy was a mass of erogenous zones.
Wherever my finger touched, Chaerin reacted with raw sensitivity.
As climax approached her legs clamped shut.
They squeezed my finger and began shaking violently.
I didn't stop. If anything I moved faster, deeper.
From the overwhelming orgasm her hips instinctively tried to pull back a little. Of course that wasn't nearly enough to escape my finger.
Seeing her squeeze her eyes shut and push her face forward, hungry for more of my kisses, only made me finger her pussy even more enthusiastically.
"Ah, euk! Haaung…! I-I'm cumming…!"
The climax moan burst out between the lips we were still kissing.
Her body stiffened as if turning to stone, then immediately convulsed with violent spasms.
The force of her walls clamping down on my finger became tremendous.
-Pshuut, pyutsuutsu!
At the same time hot love juices spurted like a fountain, soaking my hand and thighs.
The mattress got so thoroughly drenched that all of Chaerin's earlier efforts to keep cum off it became meaningless.
Even while climaxing she never pulled her lips away from mine.
Did she like kissing me that much?
I waited until her body calmed, then slowly broke the kiss.
Chaerin looked up at me with moist eyes, gasping for breath.
Someone once compared a woman's orgasm to waves; her face still looked like she hadn't fully come out of them yet.
Even after cumming twice today and just receiving sexual processing, my cock was still throbbing vigorously.
Only after a long while did she recover her senses. Seeing her pants and the mattress soaked with love juices, and her own hands still coated in cum, she hung her head low.
She must have been terribly embarrassed; without a single word she leapt up from the bed as if fleeing and bolted for the bathroom.
"Hoo…"
Left alone in the room I let out a satisfied sigh.
Judging by that reaction, it seemed I could have sex with Chaerin whenever I wanted.
If I propositioned her tonight she wouldn't refuse. She'd probably act annoyed while spreading her legs for me.
I'd already done it with my homeroom teacher; there was no reason not to fuck my twin little sister either. Chaerin seemed to like me too.
Chaerin, Subin, the vice class president Cha Ayeong, and the countless classmates who already showed me blatant interest…
Couldn't I fuck every last one of them if I just put my mind to it?
Just thinking about it made my lower body heavy. This world was without a doubt a paradise for a man with a libido like mine.
Still lost in pleasant fantasies, I stood up.
While Chaerin washed I looked around the room for something to do, and an old bookshelf in the corner caught my eye.
An album and a fairly thick diary on the bottom shelf drew my attention.
Come to think of it, I knew almost nothing about this body's—Kim Sihyuk's—past.
How his parents had died, what his childhood had been like.
I'd heard the rough version from Chaerin, but I wanted to see it with my own eyes.
When I pulled the album and diary free they were clean, without a speck of dust.
Maybe after the original owner of this body got into the traffic accident, Chaerin had looked through them out of longing.
Imagining her flipping through these because her twin oppa had been in an accident made my chest ache a little for her.
I took the album and diary and started toward the dining chair.
That was when it happened.
Thud.
A thin sheet of paper slipped out from between the pages of the diary I held in my left hand and fluttered to the floor.
What?
Without thinking I bent down to pick it up—and before I could stop myself I read the sharply scribbled writing across it.
It is not amnesia. I must remember. I am—