I stopped Nari for a moment as she was about to lie facedown on the floor, though I remained seated on the bed.
Nari looked up at me with a puzzled expression.
“Take off your clothes and do it.”
When I told her to undress, Nari’s face lit up.
As if she’d been waiting for this, she rose and began taking off her clothes.
Perhaps she had learned how to undress from her mother as well, because she removed them slowly while maintaining eye contact with me.
She grasped the shoulder line of her minidress and slowly pulled it down.
The tight black fabric slid smoothly down, revealing her pale shoulders and collarbones.
Fluorescent light from the sexual-relief room poured over them, creating a soft sheen.
Next, Nari bent slightly at the waist and pulled the dress all the way down below her hips.
When the black fabric slipped to the floor, all that remained on her body was a black bra and black lace panties.
Without a hint of embarrassment, Nari unclasped her bra with a click and let it fall to the floor, then gripped the sides of her panties with both hands and slowly pulled them down.
Past her white thighs, knees, and then ankles.
When the black lace panties finally slipped off her feet, Nari’s naked body was fully exposed.
I liked Nari’s body very much.
She was tall and slim, but had an ideal figure with large breasts and buttocks.
Her voluptuous breasts, too large to fit in one hand, her slim waist, and the smooth curves of her legs were perfectly proportioned.
Her neatly groomed pussy, in particular, was beautiful enough to be a work of art.
Having finished preparing, Nari knelt before me again.
Then, without the slightest hesitation, she lowered her head deeply until her forehead touched the floor. It was a perfect dogeza posture.
When Nari raised her head to give me a reverent kiss, I said with a grin:
“If you give me good fellatio, I’ll have sex with you too.”
Nari’s eyes widened with astonishment and uncontrollable joy.

“…Yes!”
Nari approached my cock with a solemn expression, as though she had made up her mind.
-Smack.
Her lips, which had just kissed it reverently, parted, and at last that long tongue appeared.
“…Wow.”
As soon as my glans entered her mouth, her long, soft tongue wrapped perfectly around the entire glans.
The strange sensation of her tongue being long enough to circle my glans and still have length to spare never grew familiar.
The feeling of her soft, warm tongue squeezing my glans tightly made my thighs tense involuntarily.
Realizing that I was pleased, Nari gave me an alluring smile and began using her full technique.
“Mmm, slurp….”
She didn’t linger long on stimulating my glans.
After softly licking my glans several times to warm it up, she immediately took my cock deep into her mouth and began working the shaft.
Nari’s long tongue licked in spirals from my glans to the root, then from the root back to the glans.
At the same time, she gently cupped my balls with her free hand and rolled them softly.
The pleasure assailing me from above and below simultaneously left me unable to think straight.
“Smoooch, smack, slurp, schluup.”
I vividly felt her tongue moving over the shaft.
Next, she rubbed it with her lips. It felt completely different from her tongue.
Her thick, soft lips moved up and down the shaft, rubbing it gently.
After thoroughly caressing the entire shaft with her lips, Nari began using her tongue again.
“Hwaup….”
This time, she swept her tongue upward over my glans. Her broad, flattened tongue dragged heavily from the root to the tip of the glans.
That fellatio technique made it feel as though semen were rising from my balls.
I was completely swept up in Nari’s fellatio rhythm.
Nari wasn’t using her techniques haphazardly; she was carefully controlling the pace and intensity.
On top of that, she occasionally dried out her mouth, giving it a rough texture.
Her technique of tickling my sensitive glans and urethral opening with the tip of her tongue truly lived up to its reputation.
Softness and intensity, wetness and dryness, ceaselessly alternated.
“Ngh…!”
“Chup, chup, shrrr, shrrr, shrrr…!”
As she frantically licked my glans with her rough tongue, a tingling pleasure surged through me, along with the sensation of all my nerves converging on my glans.
My glans alone had already reached its limit, but she didn’t stop there and began attacking the shaft as well.
Nari’s lips sucked hard on the shaft, creating a vacuum inside her mouth.
It was overwhelming pleasure, as though my entire cock were being sucked inside her.
When I let out a soft moan, Nari, as if she’d been waiting for it, tried to demonstrate one more technique.
“Shall I deep-throat you?”
The deep-throat technique we’d learned in class today.
Apart from Iseol noona, no one had practiced it on me yet.
“Try it.”
It was a technique even Iseol noona had struggled with because of the size of my cock.
“Mmm….”
But Nari swallowed my cock deep into her throat without so much as twitching an eyebrow.
The sensation of my glans sliding down her esophagus, along with the pressure of her narrow, hot throat-pussy squeezing it tightly, made it difficult to endure.
“I’m going to cum!”
I pressed down a little more firmly on Nari’s head while she was deep-throating me.
I heard a startled gag from Nari, but I paid it no attention.
The lips covering the root of my cock twitched.
My urge to ejaculate had built to the brim, so I didn’t hold back and came right then.
-Brrrlt!
Hot semen poured deep into Nari’s throat.
“Hoo.”
Once, twice, three times, four times, five times.
I sprayed semen in five shuddering bursts, and all that fluid traveled down Nari’s esophagus and into her stomach.
When I pulled my cock from her mouth, Nari exhaled violently.
“Phaa…!”
She coughed a little, as though she had been unable to breathe for a long time, but there was no trace of resentment toward me.
Rather, her upturned gaze held an emotion that seemed to crave praise.
“Was that all right?”
I nodded, acknowledging Nari’s perfect fellatio.
If Iseol noona’s mouth-pussy was the product of hard work, Nari’s had both talent and effort behind it.
At present, the two were evenly matched, but after a little more time, Nari’s fellatio skills would probably overwhelm noona’s.
No—if I judged coldly, Nari might already be a little better at fellatio.
Perhaps it was because I’d already had sex with Iseol noona that I was unconsciously rating her more favorably.
In any case, I languidly rose to keep my promise.
“Get on the bed.”
“Yes!”
Unable to hide her joy, Nari climbed onto the bed.
She tried to push me down, spread her legs, and assume the cowgirl position. But I deliberately stopped her by gently pressing down on her shoulders.
“Wait. Have you ever learned the cowgirl position?”
Nari’s face reddened slightly at my question.
“Um, only the theory… I had to preserve my virginity, so I couldn’t practice properly. I just learned the position a little from my mother.”
I smiled involuntarily at those words.
“Then I’ll teach you. Lie down.”
I gently laid Nari down on the bed. Cowgirl was nice too, but perhaps I’d start with missionary.
Nari obediently followed my instructions and lay down on the white bed sheets.
My gaze slowly traveled from the crown of Nari’s head to the tips of her toes.
Her moist lips were slightly parted, as if waiting for a kiss.
And I noticed the subtle change as her pale pink nipples slowly stiffened from lust and anticipation.
My gaze passed over her slim waist and softly curving hips before reaching her pussy.
The area around her entrance was already glistening with the arousal fluid that had flowed out while she gave me fellatio.
“You have a great figure. Do you take after your mother?”
My teasing question made Nari’s face turn even redder.
“Yes… Mom was even prettier than me when she was young….”
“Hmm, is that so? I’d like to meet her sometime. Since she raised such a well-brought-up daughter, I should at least greet her.”
Of course, that was only half a joke. Why would I go out of my way to fuck my classmate’s mother?
I’d only said it to get her excited.
I positioned myself between Nari’s legs. Instead of inserting my fingers right away, I first gently stroked the flesh on the inside of her thigh with my palm.
“Hng….”
Nari’s body shuddered at my touch. Her breathing began to grow faster little by little.
Enjoying Nari’s reaction, I moved my hand gradually higher, toward her pussy.
At last, my fingers touched her pussy, wet with arousal fluid.
The viscosity of the sticky fluid, the heat within her, and the sweet yet faintly fishy feminine scent coming off her stimulated all my senses.
“Why are you so wet? All we did was kiss and have fellatio.”
Though she blushed shyly at my teasing question, Nari answered honestly.
“Because I’ve been looking forward to it since… you called me, Mr. Sihyeok.”
Her audacious answer made my lower body throb. I spoke while stroking Nari’s wet inner flesh with my fingers.
“Just in case, I’ll tell you now: I don’t want you getting pregnant before marriage, so make sure you take your birth-control pills.”
“Don’t worry.”
Nari answered clearly even as her waist trembled under my fingers.
“Even if I do get pregnant, I’ll never bother you, Mr. Sihyeok.”
Even though I knew that was common sense in this world, it left me with a strange feeling.
I said nothing more and fingered her pussy.
When I gently spread open her wet entrance with my fingers, pale pink inner flesh appeared.
I lightly pressed the most sensitive spot inside her pussy with my fingertip.
“Nngh…!”
Nari shuddered and let out a short moan.
Without teasing her any longer, I brought my precum-slick glans to her entrance and gently rubbed it from side to side.
Swish, swish.
Along with a slick friction sound, the tip of my glans brushed against the clitoris, which had already swollen hard.
“Haa, ah…!”
The moan that burst from Nari’s mouth was incredibly sultry.
Nari’s large breasts rose and fell rapidly, a thoroughly lewd sight.
I slowly pushed my hips forward.