Unfamiliar Gender, Unfamiliar Lust (1)
Today, I had planned to take a shower as soon as I woke up.
To avoid any misunderstandings, I should add that I have always been someone who showers every day.
However, being a jobless bum with my days and nights reversed meant I preferred to avoid running into my family members. That also meant it was difficult to head out to the living room on weekends, or to the bathroom that required passing through the living room.
Yeah.
A bum.
Han Ji-eun, twenty-four-year-old male, no occupation. After failing the college entrance exam three times, I had given up, so I was not a student either.
A high-school-graduate bum.
That was me.
Anyway, since it was now Monday afternoon, I figured all three of my family members would be out, so I reached for my door—
‘Huh?’
A sense of wrongness hit me a moment too late.
My body felt unfamiliar.
The center of gravity?
The eye level?
Or maybe—
“…Huh.”
I looked down.
The fog in my head, still thick right after waking, cleared in an instant.
“Huh!?”
Something that should not exist was there.
Panicking, I grabbed it with my hand, wondering if someone had played a prank by stuffing a balloon down there—even though that made no sense.
“Agh!”
Pain.
And a softness far too realistic to be fake.
‘It’s real.’
Then.
Could it be—
I rushed to the bathroom. As expected, the living room was empty.
The moment I stepped inside, the mirror came into view.
“…No way.”
Reflected in it was an impossibly beautiful woman.
Her long black hair was tousled, and she wore a wrinkled T-shirt and sweatpants from sleeping in them, yet her beauty could not be hidden.
Her facial features resembled the other women in our house—cat-like. But while the other three gave off the air of fierce alley cats or aloof aristocratic felines, mine was softer, rounder, like a lap cat. Was it the shape of my eyes, or the curve of my lips?
Her skin was pale and flawless, smooth without a single blemish.
Her height was around 160 centimeters. The legs visible beneath the T-shirt were slender, yet the thighs looked soft and plump.
And then—
“Whoa…”
No.
Could breasts really be this large? How was something like this even possible in real life?
‘This has to be a dream.’
Just as I was about to pinch my cheek, I heard the sound of a door opening.
“!?”
Who was it?
It was Monday afternoon—my older sister and mother should be at work, and my younger sister at university.
‘I didn’t close the bathroom door!’
Before I could shut it, I came face-to-face with my younger sister, who had burst out of her room.
“J-Ji-yeon unni! Did you also get something weird down there—”
Our eyes met.
Silence.
“Wh-who are you?”
Her voice was full of wariness.
Han Ji-ah.
My younger sister, the prodigy who had gotten into a good university on her first try—unlike me.
“Are you one of Ji-yeon unni’s friends?”
Of course.
She had called me “unni” because she mistook me for our older sister.
More importantly—
She was dressed in a T-shirt and dolphin shorts, her usual at-home outfit.
Yet something about her silhouette felt off.
Especially the lower half she was pressing down on with both hands.
“I-I’m…”
What was I supposed to say?
“Who are you!?”
Ji-ah shouted, her cheeks unusually flushed, her breathing ragged.
“Tell me before I call the police!”
“I-it’s me, your oppa.”
I felt embarrassed. In any other situation, I probably would not have been able to call myself her oppa at all.
“…What?”
“I’m your older brother, Han Ji-eun!”
My younger sister’s disbelieving gaze raked over my body.
The long hair.
The feminine face, the legs, and then—
“!!”
After seeing my chest, Ji-ah gritted her teeth and squeezed her hands tighter over her lower body.
“J-Ji-ah.”
“Don’t come any closer!”
Her voice was strained, her breathing heavy, her cheeks bright red.
Maybe—
“Do you have a fever or something?”
Why had I not considered it earlier?
If I had changed like this, then Ji-ah might have changed too.
No.
It was not that I had not thought of it.
I had deliberately looked away.
If something had happened to Ji-ah, it would feel like my fault somehow.
So I had looked away, wanting to be a good older sibling for once.
“M-maybe you’re coming down with a cold? That’s why you didn’t go to school, right?”
I stepped closer.
With every step, Ji-ah’s condition seemed to worsen.
Not just her cheeks—her entire face was flushed, and ragged breaths escaped through her slightly parted lips.
“I told you not to come closer! Whether you’re really Han Ji-eun or whatever, just get out of my sight!”
Her words were harsh, but she did not turn away or move, fidgeting in place.
“If you’re not feeling well, I can help—”
When I took the final step forward, something pressed against my stomach.
Thud.
‘Huh?’
An unbelievable heat that should not have been there.
I looked down.
Between Ji-ah’s hands, which had been desperately trying to hold it down, a massive shape had sprung free, standing erect and pointing straight at my stomach.
“What… the hell…”
It was huge.
Even through the fabric of her dolphin shorts, I could feel its scorching heat against my stomach, pulsing with every heartbeat.
‘Why does Ji-ah have this?’
A stupid thought.
It was as if the blood meant for my brain had gone somewhere else entirely.
Slowly, I lifted my head again, trembling.
“Y-you bitch!”
Ji-ah’s hands shot forward and grabbed my neck.
***
Han Ji-ah, younger sister of Han Ji-eun, had always prided herself on her strong will—whether it was studying or managing her weight.
Yet the desire that had woken her this morning, burning through her lower body, was far more powerful than any temptation she had ever felt.
‘What the hell…!’
Hot.
Her body was hot. Her head was hot. Everything felt hazy, and even her own breath burned.
What was this sensation?
This intense thirst, this craving, this urge to release?
As she sat up, pressure was applied to the “something” between her legs.
In an instant, a bolt of pleasure struck her.
At the same time, she became aware of a body part that should not exist.
“…!”
A moan that never became a scream escaped her throat.
Ji-ah hurriedly sat up.
‘No way.’
The fabric of her favorite dolphin shorts was stretched to the point of tearing, bulging outward as if a thick rod had been forced inside.
She carefully reached out to touch it.
“Ugh!?”
Half pleasure.
The other half—shock at confirming that it was truly part of her own body.
Ji-ah quickly pulled her hand away and slowly tugged her pants down.
“W-wow…”
This was—
That.
A penis.
In crude terms, a cock.
She had never imagined that the first real one she would see in her life would be her own.
Well, she had seen one before.
Back when she was little, attached to that pathetic person who used to live with them.
‘But still.’
The one on the person she refused to even call “oppa” had not been this big.
Then belated embarrassment washed over her.
‘What do I do…?’
There was no way she could attend lectures or meet friends in this state.
Whether she wore a skirt or pants, there was no hiding something this large. She could not keep covering it with her bag all day either.
Plus—
“Ugh.”
Again and again.
This heat, this urge to release, stirring through her body.
Once she realized the unfamiliar sensation was sexual desire, her head spun.
‘Sexual desire?’
The only kind of lust Ji-ah knew was the mild warmth that spread through her body before and after her period.
A quick rub of a sensitive spot was usually enough; she did not need to go all the way to climax if she was tired. Or if something important came up, she could simply ignore it and move on.
‘Right. Just forget it. Forget it for now.’
She could not bring herself to touch her own penis.
And yet—
Somewhere deep in her instincts, Ji-ah already knew.
If she touched this new organ growing from her body—
If she did more than just brush it lightly, if she wrapped her hand around it and stroked—
She would never be able to stop.
It would not be like simply rubbing her clit until the urge passed.
She would keep going until she expelled all the heavy, smoldering heat pooled in her lower belly through her penis—until she came, shaking her cock like a beast in heat.
“Ugh…!!”
No.
Think about something else.
‘I don’t want to.’
A single phrase containing two conflicting desires.
She did not want to touch her penis.
And she did not want to distract herself from the desire either.
Then what?
Right now, the base of her cock was twitching.
The desire was burning black and hot.
That was when she heard a sound from outside her room.
‘Who is that!?’
She had thought it might be that freeloader in the house, but—
“Whoa…”
The breathing she heard when she listened closely belonged to a young woman.
Then—
‘Ji-yeon unni?’
The eldest of the three siblings… probably.
Something felt different, but she had no room to notice such details. The strange thing between her legs had taken all her attention.
“J-Ji-yeon unni!”
Ji-ah hurriedly pulled up her pants, pressing down on her cock as it tried to spring forward, and rushed out of her room.
However—
“Did you also get something weird down there—”
It was not Ji-yeon.
It was not their mother either.
‘Who the hell is this woman?’
Her harsh reaction was not simply because the person was a stranger.
Right now, of all times—while Ji-ah was struggling with a male lust she had never experienced in her life—the thing standing right in front of her was—
A defenseless, clumsy female with an obscenely voluptuous body.
And the moment Ji-ah saw her—
‘Crazy bitch, double bitch, dog bitch…!’
Ji-ah was not someone who enjoyed swearing. If anything, she avoided it.
Yet now, curses rose naturally in her mind.
As if the unreleased sexual desire had undergone some bizarre metabolic process and turned into insults.
Ji-ah clenched her teeth.
The breath leaking between them was hot.
“Wh-who are you?”
The fact that she could even speak in this situation was proof of just how strong-willed Ji-ah truly was.
“I-I’m—”
They exchanged a few words.
But at that moment, Ji-ah’s mind did not care about the woman’s identity, whether she was really her older brother Han Ji-eun, or anything else.
Her cock was the only thing that mattered.
No.
The only things that mattered were her cock and the female standing before it, the one her cock desired.
‘Fuck, bitch.’
Her head was burning with heat, yet the details of the female in front of her burned even clearer into her vision.
A pretty face that could never look prim.
Long, tousled hair that would probably smell like a woman if she pressed her nose into it.
‘And that body—fuck, what a slut.’
Narrow, delicate shoulders.
A cinched waist, but a lower belly so plump it looked like it would yield under her fingers.
‘I want to spank that ass until it turns bright red and she’s crying.’
Her hips flared wide, and her buttocks were so soft and round that slapping them felt like the natural thing to do.
And her breasts.
Two massive mounds the size of melons—no, watermelons.
‘If I kneaded them like rice cakes or clay, she would probably cry out in pain, right? Then I could tell her to shut up while I—’
Standing before Ji-ah, who was experiencing male lust for the first time, was a prime specimen of a female.
Despite having such a body—
Whenever she whined, her hips swayed. Her breasts bounced, unrestrained by a bra.
An unconscious seduction.
A defenselessness that seemed to beg to be hit, to be devoured.
‘Fuck. Fuck, fuck.’
This was bad.
Her mind was going strange.
If she stayed like this any longer, she would definitely end up doing something dangerous.
So she needed to go back into her room, but—
Her cock, which she had barely been keeping hidden, had grown even harder at the sight of the female in front of her.
One wrong twitch and it would slip out from between her hands. She could not move.
Right at that moment, the female took one step closer, then another, until finally—
“I can help you with something—”
The cock that had been held back finally sprang free.
Like a released spring, it thrust forward and poked into the soft stomach.
And at the same time—
The last thread of reason barely holding Ji-ah’s desire in check—
“Y-you bitch!”
Snapped.
She could no longer hold back.