Chapter 6
The bathroom door opened cautiously, and Chaerin appeared through a cloud of milky steam.
A fresh, youthful body-wash scent wafted from her newly showered body.
Though she'd dried her hair, it remained slightly damp, while her pale cheeks were flushed from the hot steam.
As the moment when her breasts would be touched approached, her usual prickly demeanor vanished without a trace, leaving only the face of a shy girl.
Chaerin was wearing loose, short-sleeved pajamas. Through the thin fabric, the clear outline of her perky breasts was visible.
“…You were still looking?”
Chaerin noticed me holding the textbook and averted her gaze. I chuckled, moved the book aside, and beckoned to her.
“Come here.”
Chaerin worried at her lip for a moment. Then, as if she'd resigned herself, she trudged over and carefully sat in the chair before me.
Despite probably being tired from her part-time job and preparing dinner, her eyes held a faint, tremulous anticipation.
“Can I touch your breasts?”
At my words, Chaerin's shoulders trembled. With her head bowed, she mumbled softly,
“…D-do whatever you want.”
“I’m going to do it as the textbook says. Think of it as previewing the material.”
I said it playfully as I brought my hand to the hem of her pajama top.
The thin, soft fabric felt smooth beneath my fingers. As I slowly lifted her top, Chaerin's pale, slender waist and belly were revealed.
Chaerin sucked in a sharp breath and tensed her stomach. Her entire body had gone rigid with tension.
When I pulled the top completely up, her pale-pink bra came into view.
This was the first time I'd ever seen my twin younger sister's underwear up close like this.
At the unfamiliar sight, my cock suddenly throbbed.
Her bra couldn't fully contain her ample breasts. The soft flesh of her upper breasts spilled slightly over the top.
“Take this off too.”
“……”
Instead of answering, Chaerin lowered her head and undid the hooks behind her back with trembling hands.
Whether from anticipation or nervousness, her fingers fumbled several times before a tiny click signaled that she'd undone the bra.
At last, her two lovely breasts appeared fully before my eyes, completely uncovered.
“Wow….”
An exclamation escaped me before I knew it. Two breasts nestled against beautifully fair skin.
At their tips were shy, pale-pink areolas and small nipples that were still asleep.
I recalled the words from the textbook.
“Get ready.”
“…What?”
“That’s what the textbook said. Before welcoming your master, you’re supposed to make your nipples stand erect and get ready.”
At my words, Chaerin's face flared bright red.
“A-are you crazy? H-how am I supposed to do that…!”
“You have to do it yourself. Come on.”
I folded my arms and urged her on like a strict teacher.
Normally, I wouldn't have been able to be so forceful with Chaerin, but somehow, things were different now.
Maybe I had a talent for handling women.
In my previous life, I hadn't even properly held a woman's hand, so I'd lived without knowing I possessed such a talent.
Chaerin hesitated for a moment before bringing her trembling hand to her breast.
Her small hand lightly gripped her pajama top and began gently rubbing her nipple through the fabric.
The sight of her caressing her own breast. Chaerin squeezed her eyes shut in embarrassment, but I was so aroused that I clenched my fist.
Before long, a thin moan slipped from Chaerin's lips.
“Hngh….”
After a while, Chaerin cautiously withdrew her hand. I held my breath and watched the change.
Her nipples, which had been fairly flat only moments ago, were now standing stiffly.
The small protrusions stood hard and erect, flaunting themselves—a perfect signal that she was ready.
“Good job.”
With a satisfied smile, I stripped off Chaerin's pajama top and finally reached my hand toward her breasts.
The moment my fingertips touched her warm, soft flesh, Chaerin's body jolted violently.
“Haa!”
Her reaction was so intense, it was as if electricity had run through her body.
For a moment, I wondered if something was wrong, but her expectant gaze made me keep touching her.
I gently enclosed her right breast with my entire palm.
It was full and yielding, overflowing from a single hand.
I slowly applied pressure, rolling my palm in a circle.
I could feel her nipple standing stiffly beneath my palm. I could also see Chaerin flinch each time I pressed it with my hand.
“Haa… ngh…!”
Chaerin twisted her waist and bit her lip as if trying to hold back her pleasure.
By what I knew, it was strange for a woman to collapse helplessly from this degree of breast caressing.
Maybe the women of this world not only had stronger libidos, but more sensitive bodies as well.
Further aroused by Chaerin's appearance, I caressed her other breast in the same way.
I cupped both breasts with both hands and gently rolled them in opposite directions.
It almost made me sad to think that I'd lived this long without ever touching a woman's breasts.
With the tip of my index finger, I flicked her erect nipple lightly—very lightly. It trembled beneath my touch.
“Hyaa!”
Chaerin made a sound bordering on a scream and jerked her pelvis. Her reaction was far more sensitive than I'd expected.
Amused, I alternated between the two nipples, teasingly flicking them with my fingertips.
Each time, Chaerin grabbed my shoulders, trembling as though she didn't know what to do.
I recalled what I'd seen in the textbook. Then I carefully took Chaerin's right nipple between my thumb and index finger.
“Wait, Sihyeok… haa… stop….”
Chaerin asked me to stop in a sweet voice.
I ignored her and tightened my fingers, lightly pinching her right nipple. Then I pulled it upward.
“Hwaaang…!”
A scream close to climax, on an entirely different level from before, burst from Chaerin's lips.
Her eyes lost focus and grew moist. Sticky vaginal fluid was already flowing between her legs, soaking the crotch of her pajama bottoms.
“It’s not over yet.”
I whispered mischievously and slipped the pinched nipple into my mouth.
“Kyaa…!”
Chaerin couldn't even manage a proper scream.
She merely trembled as the surprise and shock of a man's mouth on her nipple mingled with the overwhelming pleasure surging through her.
I wrapped my tongue around Chaerin's nipple and rolled it very slowly.
Each time I lightly tapped the nipple with my tongue and its tip, Chaerin's lower body jerked as if convulsing.
With my mouth, I softly sucked her right nipple while applying steady pressure.
When I stiffened my tongue and pressed the most sensitive part at the tip of her nipple, Chaerin's body sprang up like a coiled spring.
“H-hey! You’re only supposed to touch them…!”
The only sounds that came from Chaerin's lips were moans steeped in pleasure.
It was the first time I'd ever made a woman orgasm.
As I watched Chaerin tremble, I felt a sense of conquest as if I'd gained the entire world.
The emotion was so unfamiliar and intense that I didn't know how to stop. No, I hadn't even thought that I should stop in the first place.
I continued enjoying her reactions while tightening my grip on her left breast.
With my fingers, I lightly took her hardened nipple between my thumb and index finger and slowly, persistently twisted it clockwise.
“U-uh…! It’s strange, strange… My head’s spinning…!”
Soft, wet pleasure overwhelmed Chaerin on the right, while sharp, tingling pleasure assailed her on the left.
Her brain seemed to completely overload from the two contradictory sensations.
In the end, Chaerin couldn't endure it and twisted both thighs together.
I didn't stop this time either.
“Sihyeok, my, my breasts feel strange… Please… hngh!”
Chaerin's plea was the highest praise I could receive.
As before, Chaerin's waist began to lift. She looked like she was about to climax again.
The hand gripping my shoulder continued to tighten.
I used both my mouth and hands to stimulate both of her nipples at the same time.
“No, no, no…! I can’t take any more…! I-I’m cumming…!”
Finally, I lightly—very lightly—bit the tip of Chaerin's thoroughly moistened right nipple with my front teeth.
It was a sharp stimulus she would certainly feel, but not enough to cause pain.
At that moment,
“Hiiiiing!”
A long, tearing scream burst from Chaerin's lips.
Her white body went rigid on the chair and trembled as if in a seizure.
Her eyes were nearly rolled back, and saliva dripped from her mouth.
Both hands lost their grip on my shoulders and desperately flailed in the air as if trying to grasp something.
A gush of arousal fluid poured from between Chaerin's legs, completely soaking her pajama bottoms.
How much time passed like that?
After the storm of intense pleasure had passed, Chaerin was completely exhausted and went limp in my arms.
Between the energy she'd spent on her part-time job and preparing dinner and the intense nipple stimulation she'd experienced for the first time in her life, she was utterly drained.
Chaerin breathed heavily, her hair damp with sweat and clinging to her cheek as she leaned against my shoulder.
“…I’m tired.”
The voice Chaerin barely managed to squeeze out was hazy, as if she were drunk with sleep.
I quietly held her close. Her soft, warm breasts pressed fully against my chest.
A satisfied smile naturally formed on my face. Completely exhausted, Chaerin fell asleep in my arms, breathing softly.
I lightly kissed her forehead, damp with sweat. That was as far as we went tonight.