First Sex with My Yandere Childhood Friend
Seo Narae, twenty-three, college student.
She had not just one but four childhood friends—a breed rare enough that even a single one was supposed to be a miracle.
There was the one who never came out of her room, the one who played big sister and den mother to everyone, the one whose love for one particular person burned heavy and obsessive… Their personalities were so wildly different that if their homes hadn't all been so close together, they probably never would have crossed paths at all.
But the cream of the crop was a boy named Kim Yuseon—the very first friend Narae had ever made.
'Yuseon! Let's play house!'
'Okay, you be the patient. I'll be the doctor.'
'…? Okay! Got it!'
A mischievous boy who was always pulling some strange prank on her.
Truthfully, "the first friend she ever made" might not even be the right way to put it. The two of them had been side by side since the day they were born.
They'd known each other since the dimmest reaches of early childhood, and their parents got along so well that the two families traded visits back and forth more times than anyone could count.
But somewhere through elementary school, middle school, and high school, the distance between them quietly grew.
'Yuseon! Let's walk to school together!'
'Nah. It's embarrassing. Go ahead.'
'Yuseon, we could be in the same club—'
'I'm not joining any clubs. It'd cut into my time at home.'
'Kim Yuseon. It's been a while—want to play a game or something?'
'I'm on a streak right now. Later.'
How had it come to this? The boy who had always walked ahead of her, pulling her along, was slowly losing his vitality and degenerating into a pervert interested in nothing but lewd things.
And on top of that, as the veil of "childhood friend" gradually peeled away, they somehow drifted even further apart than an ordinary friend of the opposite sex would have been.
It's a kind of stagnation nearly all childhood friends go through. As you grow up, familiarity becomes poison, and the relationship naturally regresses into the same distance you'd keep from a stranger.
But Narae still couldn't bring herself to let go of her precious childhood friend. Her exterior was breezy enough, but deep down she was a woman still carrying the weight of a marriage promise the two of them had made as children.
When he took a leave from college and shipped off to the military, she was so unmoored that for a while she could barely manage to eat properly.
During their school years, she had even gone out of her way to shoot warning glares at any girl who got too close—actions born of the anxiety that as Yuseon grew more and more handsome, someone was bound to come sniffing around eventually.
Narae herself never realized this was behavior rooted in love. In her heart of hearts, she was always thinking of her childhood friend, scheming up ways to spend even a minute more of the day by his side.
Then one day, a once-in-a-lifetime opportunity arrived—the kind that could turn their drifted-apart relationship right back around.
'Would you all be willing to have sex with me?'
A request that made it sound like he saw the childhood friends he'd grown up with as nothing more than tools for relieving his urges.
But to a girl in love, that request could only register as the chance of a lifetime.
First, using the slightly underhanded excuse that it would be a problem if he knocked up the other girls, she got a look at his cock.
Jumping straight into actual sex felt a little too much like losing, so for their first round she'd tested the waters with a handjob.
A few more times after that, she helped him take care of his needs—and then the days rolled by until yesterday.
After twenty years of history, the two of them had finally become connected, if only physically.
'Ugh, my hips still ache…'
Never in her wildest dreams had she imagined her first experience would end up like this. After all, Narae had been imagining something with a far more romantic atmosphere.
What had actually happened, though, was that she'd been secretly peeping at the two of them—no, at him—from outside the door, got caught masturbating, and ended up having sex because the mood demanded it. An event that sat, shall we say, somewhat apart from romance.
'If all that semen went inside me, I'd have to be pregnant. No question.'
She rubbed her lower belly as she recalled the way her childhood friend had cum, hard, deep inside her womb.
The professor's voice rattled on right in front of her, lecturing this way and that, but not a word of it made it into her head. She just kept turning over everything that had happened yesterday, drowning in the afterglow.
And then, a little while later.
"Narae? Do you think you could spare a little time for me?"
The moment class ended and she moved to leave the lecture hall with her friends, a familiar-looking male student stepped into her path.
He was a returning student, two years her senior, and decently popular within their department thanks to his good looks.
'I distinctly remember rejecting his confession last time. Diplomatically, even.'
He'd already made his dash at Narae once and been shot down, but apparently none of that mattered, because here he was flashing his charms at her all over again.
Did he genuinely believe he still had a chance? Whatever the case, Narae found it nothing short of repulsive.
Let me buy you dinner and we can talk, let's go see that new movie that just came out…
The textbook repertoire of a guy trying to reel in an underclassman girl. Having turned down countless men before, Narae saw right through every word of it.
But she had grown another level, thanks to what happened yesterday. It might sound strange to say sex makes a person grow, but the fact remained: mixing bodies with the childhood friend she loved had given her courage.
"Nope. I have a boyfriend now."
One who's way hotter than you and packing way more cock, too—she kept the insult safely inside her head.
And just like that, the excuse she used to turn down confessions changed from "I'm a little busy" to "I have a boyfriend."
One day after graduating from virginity.
I was getting my cock inspected under the withering glare of Areum, who had materialized out of nowhere the moment I walked in.
"Sniff sniff. Your cock smells like another woman, oppa… I'd already guessed as much, but you really did have sex."
Figured I'd get caught. Though I have no idea how she clocked it by smell alone.
"Well, uh. I went over to Seol-ah's place yesterday and the mood just kind of happened… More importantly, I hear you taught her how to masturbate?"
"Yes. I wanted unnie to discover the pleasure of fingering her pussy while thinking of you too, sniff sniff."
Apparently the inspection wasn't over yet, because she kept answering like that while poking and prodding at every part of my cock.
"There's one more woman's scent besides Seol-ah unnie's. And this scent, I know exactly—"
One look at her face told me she'd already figured it out. She probably couldn't bring herself to accept that I'd had sex with Narae, the girl she hated so much.
"That woman, in any case… she takes oppa's firsts every single time…"
"Every time? Wait, what else did Narae and I do besides sex?"
"Do you… not remember?"
She stared straight into my face like she was genuinely worried about me.
Still, I had no memory of Seo Narae stealing my firsts often enough to earn the phrase "every single time." If I had to pick one, the only thing I ever did first with her was getting my first handjob.
But Areum, looking like death itself, began listing off my memories with Narae one by one—
"Your first hug with oppa, your first hand-holding with oppa, your first bath with oppa, your first trip with oppa, your first walk to school, your first snowball fight, your first time at the pool, your first time at an amusement park, and even your first kiss with oppa… There are about twenty more besides those, and now even your first sex has been stolen from me… sob…"
The girl forced each word out through welled-up tears, struggling to get it all out.
More to the point—what timeline is any of this from? Going by her list alone, we sound like the happiest damn couple on earth.
It's impressive that Areum remembers all of it, but who knew my first kiss had been with her, of all people.
"Well, you have known me the longest, so I guess that's just how it goes. You and I got close at daycare, after all."
"It's the regret of my life. If only I could have met you just a little sooner, oppa…"
"You've got the face of someone witnessing the apocalypse."
Saying this might make me a terrible person, but I couldn't help thinking Areum was being awfully hung up on the past—still dragging around the kindness I'd shown her back when we were little kids.
That said, having a childhood friend this pretty stay faithfully devoted to me all these years is obviously a blessing, no complaints there.
"Just don't go hating Narae too much, okay? She does look out for you in her own way."
After all, the girl had gone so far as to throw her own body at me to stop me from having sex, just in case Areum might get pregnant.
"Hmph. I'm sure that was just an excuse she cooked up to monopolize you."
For someone who puts on a sweet little act the moment Narae's in the room, she sure turns into a biting, tearing machine the second she's out of sight.
As long as she doesn't go stabbing me in the back, I suppose I'll count myself lucky…
'Better deal with this fast.'
The poor girl had been completely deflated by the crushing sense of loss that my first time had gone to Narae.
If it came to that, things would get troublesome. Back in middle school, she once launched a two-day hunger strike because I wouldn't kiss her.
If my precious little sister starved to death, that would be a genuine disaster—so this body of mine would just have to step up and intervene.
"Show me your pussy. I'll have sex with you."
"……!"
It was a pretty cringe-worthy line, honestly, but Areum didn't seem remotely bothered by it. She peeled her panties off without a moment's hesitation.
"I've been waiting for this day all my life…!"
Deeply moved, she spun around and offered up her dripping pussy in doggystyle—my favorite position—presenting it to me like an offering.
I'd already finished twice yesterday, and yet my cock, having seen all this, revived magnificently and began craving yet another pussy.

"Oppa. Please, take my first time."
"…Yeah."
I pulled a single condom out of the cardboard box I'd stashed away after my session with Narae, and rolled it down over my cock.