The First Stamp
Thump!! Thump!!…
Ha-rin smiled as she met his steady gaze, listening to the pounding of her own heart.
If I confess, how will he answer…? Maybe I should ask for more time? That would be the right move, right? …Or not? What if he just accepts it? Ah, I really don’t know!!
“Why are you so nervous?”
“……!!”
Heat rushed to her face as if her thoughts had been laid bare.
“Haha! I called you because I have a gift for you.”
A gift? Ah…
The words weren’t what she had expected, and Ha-rin quickly smothered the flicker of disappointment that tried to surface.
“R-really? Haha… I thought for a second you were going to confess to me, oppa~.”
She waved her hands like a fan while speaking in a joking tone. He smiled and replied,
“Close your eyes. You’ll feel something touch your forehead, but just ignore it. It’s not a surprise kiss or anything, so don’t worry.”
“Hmm… But why the sudden gift? And why only for me…?”
“You’ll understand once you receive it. Or do you not want a gift from me?”
“N-no! Okay, I’ll close my eyes. Like this?”
Questions lingered, but she figured he wouldn’t do anything bad. Besides, no one in the world hated receiving gifts—especially unexpected ones.
Tap.
The moment she closed her eyes, something touched her forehead exactly as promised.
What is that?
When nothing else happened, she cautiously opened her eyes.
“Kukuk!!”
He stood there holding what looked like a stamp, trying and failing to suppress his laughter.
His face, twisted with mockery as he looked at her, filled Ha-rin with a sudden sense of wrongness. The Yoon Seung-woo she had known until now felt like an illusion, and a strange fear crept over her.
“Hey, oppa, what are you—”
Before she could voice her belated suspicion, something inside her mind was forcibly severed.
Thud.
“Heh?”
Along with the sensation of something being cut inside her head, her consciousness began to fade.

That was the moment Kim Ha-rin’s thoughts, her body, and her very soul became the property of one man.
* *
“…Huh?”
Ha-rin regained consciousness with a chill running down her spine. The first thing she saw was him, smirking as if something was terribly amusing.
“Oppa…?”
“What? Is there a problem?”
A problem?
Ha-rin looked around. The lecture hall contained only one man and one woman. She, one of the two, stood completely naked, exposed to the cool air.
There’s… no problem, right?
There shouldn’t have been any problem. And yet…
She tilted her head, feeling an inexplicable discomfort, when he spoke.
“You took your clothes off to receive my gift, remember? It’s only natural to get naked for a gift. That’s common sense, isn’t it?”
…Ah, right.
She had to be naked to receive the gift. It was such an obvious fact that she wondered why she hadn’t remembered it until now.
“You don’t have any hair down there, Ha-rin. Did you shave?”
He examined her lower body with an appraising look, the corner of his mouth twitching upward.
“Huh? Th-that’s… yes…”
Under the man’s piercing gaze that stripped her bare, Ha-rin felt embarrassed. Was this also natural? Common sense…? Then why did it feel so shameful?
???
Countless question marks floated through her mind, yet none of them turned into actual doubt.
“Your breasts are about the size I saw in the photos. A little disappointing, though.”
“Is… that so?”
He reached out and began kneading her chest without permission. No one had ever touched her there before, and the sensation was strange. It made her body grow faintly warm, stirring a vague sense of excitement.
Tap.
“Kyaa—! Hup.”
When his fingers brushed her nipple, Ha-rin trembled and instinctively covered her mouth. The vague, formless pleasure suddenly took shape. It was sexual arousal. She was feeling pleasure from a man’s touch, from the contact of skin against skin.
“Why?”
“N-no, it’s nothing…”
“Tell me. Why are you like that?”
“That’s…”
He smiled mischievously, as if he already knew. Ha-rin hesitated for a moment before answering. What lingered on her tongue was a shameful, secret feeling, but she had no choice but to be honest. Because he had asked. She always had to answer Yoon Seung-woo’s questions truthfully.
“Just now… I felt a little… something…”
She answered while fidgeting, her fingers twisting together.
“Haha! That’s normal. I set it up that way.”
“You did?”
Set it up?
She didn’t understand. But she didn’t need to. Whatever he said was always the truth, always common sense, always something she had to obey without question.
“Why are you making that face? You’re supposed to keep smiling until you receive the gift. That’s common sense. Come on, smile.”
“Ah… Haha, right…?”
Ha-rin forced the corners of her mouth upward.
“Hahah!! ‘Right,’ she says. That answer is priceless. This experiment is even more fun than I thought.”
“????”
At his burst of laughter, Ha-rin looked confused for a moment before forcing another foolish smile to follow common sense.
“Well then, time to receive your gift.”
When he pointed between her legs with his finger, Ha-rin finally failed to understand. She looked at him blankly, and he answered.
“It’s inside my pants. Take it out.”
“Huh…?”
Ha-rin was flustered. A gift inside his pants? Obviously, what was between his legs was his male organ. She couldn’t understand, but she couldn’t refuse a gift that had been given. That would be rude. It wouldn’t be common sense.
“Not going to take it out? You have to unwrap it.”
“Th-that’s… yes, I have to unwrap it… right?”
Ha-rin knelt in front of him without moving. With trembling hands, she reached for his zipper. She had never undressed anyone in her life—let alone a man. She glanced up sideways and saw him looking down at her with amusement.
Slap.
“Kyaa!”
Trying not to think about his gaze, she carefully pulled down both his pants and underwear. His manhood sprang out like a released spring and slapped against her cheek. Ha-rin let out a cute yelp, eyes wide.
Th-this is a… dick…?
It was the first time she had seen a man’s genitals in real life. She had seen videos and photos out of curiosity, but never the real thing.
“The gift is inside the dick. Do you know what’s in there?”
“What… is it?”
Even as she spoke, something she didn’t want to think about rose in her mind. The first thing that came to mind when thinking about what was inside a man’s genitals was—
“Semen.”
“……!”
Hearing the word she had only thought about made shame flood through her.
“You know what semen is, right?”
“O-of course I do! Oppa, aren’t you underestimating me too much!?”
Offended by his tone, Ha-rin raised her voice reflexively.
“Then explain it.”
“That’s…”
Her words caught in her throat. She desperately didn’t want to answer—it was too humiliating—but his words were absolute. She had no choice but to obey.
“I-it’s… something that goes into a woman’s reproductive organ and… makes a baby…”
Her voice trailed off at the end as she kept her head down.
“Reproductive organ? You mean pussy, right?”
“Ugh…”
“Right? Pussy?”
“Yes… pussy… it’s a pussy… you’re right.”
Ha-rin wanted to crawl into a hole and die. But the humiliation wasn’t over.
“Then you also know how to make semen come out of a dick, don’t you?”
“Of course I do…”
You put the dick inside a pussy. There were also handjobs and blowjobs, but saying those out loud was far too embarrassing.
“You know, right? Our Ha-rin isn’t a child, after all.”
Provoked, Ha-rin raised her voice again.
“Of course! Geez! If you underestimate me one more time—!”
“Kikik! Then show me.”
“Ugh…”
Ha-rin was immediately at a loss. She had never done anything like this before. She had never even had sex, and this was the first time she had seen a man’s genitals. How could she possibly do something like that? But she had to. She had received the gift, so at the very least she needed to take out what was inside. Fortunately, she had some theoretical knowledge. She never watched much porn, but she never expected to be recalling those memories now.
Even so, using my genitals feels wrong… and my mouth too…
In the end, after much deliberation, Ha-rin chose to grab his dick with her hand.
Twitch.
The male organ she held for the first time was large and warm. It pulsed faintly in her grip, like a separate living creature attached to a man’s body. And somehow… holding it made her feel strangely lewd. Her lower body—no, her pussy—was getting hot. Her mind felt like it was being pulled somewhere, as if something had taken hold of it.
“Hah…”
A lewd breath escaped from somewhere. Realizing that the vivid moan she had only heard in videos was coming from her own mouth, Ha-rin looked up at him in surprise.
“O-oppa, is this… really okay?”
Her voice, tinged with confusion, was filled with embarrassment.

Ha-rin looked up at me with countless question marks floating above her head, voicing her doubts. At first I thought the brainwashing had worn off like last time, but seeing her innocent, completely clueless expression changed my mind.
“What is?”
“No, it’s just…”
“Do you not want the gift I’m giving you?”
“That’s not it! It’s just…”
She kept hesitating, unable to answer. I smiled faintly and asked,
“You like it too, don’t you?”
“I… do like it.”
The answer that finally came out after her hesitation could only be honest. No matter how embarrassed she was or how much she didn’t want to say it, she couldn’t hide anything in front of me. She tried to hide her expression, but she couldn’t erase the lust that had risen to the surface. Of course she couldn’t. Every time she touched my body, I made sure she felt pleasure too. She would gradually accept the changed common sense and crave me more and more, eventually drowning in depravity. In truth, this gradual process wasn’t necessary. I could have turned her into a whore so lewd that even prostitutes would be shocked the moment the brainwashing was complete. The reason I didn’t was simple—
[Because it’s fun.]
The voice in my head interrupted my thoughts. Officially this was an experiment with the Brainwashing Stamp, but I couldn’t deny the Guide’s words.
[Kik, kik…]
“Well then, you have to keep going if you want to receive the gift, right?”
When I urged her with a smile, Ha-rin hesitated for a moment before starting to move both hands wrapped around my dick again.
Slide, slide…
Her touch was awkward, probably because she was a virgin with no experience with men. I didn’t scold her. After all, she would eventually do it desperately for her own desire.
“Haa…”
Her languid, wet eyes began to stare at my dick as if entranced. Whether she realized it or not, hot breaths were escaping her lips at a rapid pace.
Slide, slide, slide…
Her hands moved faster and faster.
“Haa— Haaah—”
Ha-rin’s lewd breaths grew longer and louder. Her half-closed eyes became hazy. The embarrassed expression quickly faded, replaced by nothing but lust on her face. The excitement had rapidly transformed her into a female lost in depravity.
Slide.
“Haa—”
Huh?
She suddenly brought her face closer to my dick, her nostrils flaring. I hadn’t expected her to start smelling it.
[Ahaha— Looks like she has a fetish for smells. She probably didn’t even know it herself. Well, she’s never had any experience, so it makes sense.]
“Sniff—”
After smelling my dick, Ha-rin’s eyes grew even more languid. When I glanced down, I saw a silver thread of fluid dripping from between her legs and sticking to her inner thigh.
“Oppa… Can I… suck this with my mouth? I-I mean, that way I can get the gift faster, right!?”
Using the altered common sense as an excuse, Ha-rin said something completely nonsensical. Her desperate appearance was so foolish and cute that I laughed.
“Sure.”
“Chuuuup—”
Unable to hold back any longer, Ha-rin took my dick into her mouth the moment I answered. Even so, there was still some awkwardness from doing it for the first time—she only took in the glans at first.
“Don’t use your teeth… That’s it.”
“Chyuup—”
Following my words, Ha-rin’s fellatio began. It wasn’t bad for a first time, but it was less stimulating compared to what I had received from Se-ah.
“Chyop— Uuuuum——”
Still, as she gradually got used to it and desperately tried to extract the “gift” called semen from inside my dick, I simply watched in silence this time. While sucking my dick, her arousal steadily increased as well. As proof—
“This ish sho guud— Chyup chyup—”
“Haha, that’s quite a sight.”
Before I knew it, her face had completely broken into an ahegao. With my dick in her mouth, she looked up at me with half-lidded, unfocused eyes, showing her true depraved self. Her flaring nostrils kept inhaling my scent, seeking even more pleasure.
“Chyup, chyupyut— Hueee…”
The break time is almost over…
It was enjoyable to watch Ha-rin realize a sexual preference she hadn’t even known she had and turn into a sow. As much as I wanted to watch more leisurely, unfortunately there wasn’t much time left. I could have held back, but the urge to climax was building, so I decided to finish.
“It’s coming…! Don’t swallow, keep it in your mouth.”
“Uhuuuuup—”
Now taking me all the way to the back of her throat, Ha-rin answered with a muffled voice.
Gulp…
“Uuuuup…!”
When I poured semen into her mouth, Ha-rin’s expression twisted grotesquely. I was the one who had climaxed, yet she shuddered as if she had orgasmed herself. Beneath her trembling hips, I could see her love juices pouring out in a flood.
“Huu…”
After finishing my refreshing climax, I looked down at Ha-rin again—
“Wow…”
There was the explicit sight of my semen filling her tongue and clinging to her teeth. That surprised me a little, but what surprised me more was Ha-rin’s face as she obediently kept the semen in her mouth without swallowing.
Her expression, lost in ecstasy, was so grotesque it looked like she had taken drugs. I could hardly believe this was the same girl I knew.

“Now swallow.”
After watching the unexpected scene with mild disgust, I gave the order.
“Gulk—!”
Her throat bobbed slowly as she swallowed the foreign substance that had just been inside my body.
“Hwaaaah…”
The moment she swallowed the semen, Ha-rin’s eyes widened to their limit. A dangerous sense of alienation appeared in her gaze, as if she were looking at another world. I could see her love juices pouring out from her pussy in real time, forming a puddle on the floor.
“Oppa… This… feels so good…! This gift…!! It’s the best!!”
After lingering in that dangerous afterglow for a moment, Ha-rin suddenly grabbed my legs and begged.
“Again.”
Pressing her face against my dick, Ha-rin looked up at me with eyes still hazy from pleasure.
“Give it to me♥”
She was openly displaying her lust, craving me.