The Girl Who Wants to Show Me Her Photos
"...Oppa, is something wrong lately? You've been looking a bit pale..."
My kind younger sister sat across from me at the dining table, her eyes filled with concern as she examined my complexion. I felt my face flush, and I hurriedly shook my head, waving my hands in denial.
"No, it's nothing like that... Don't worry, Hyun-seo."
"Hmm..."
She raised one eyebrow, looking at me with a skeptical, piercing gaze, before letting out a sigh.
"...Oppa."
"Y-yeah?"
"...Is working so hard for my sake taking a toll on you...?"
As she muttered those words, looking so dejected, I looked up at her and offered a faint smile. Her large eyes welled up with tears as she continued to mumble.
"...My poor brother, with that pathetic, weak body that can't even beat me at arm wrestling, what kind of money are you trying to earn... Are you just going there to be bullied all day long...?"
"W-what are you talking about? That's not it at all..."
'...Though, to be fair, I've already been through things much worse than bullying for the past two days.'
Flustered, I set down my chopsticks and gently patted the head of my sister, who was now sniffling.
A moment later, calmed by my touch, she wiped away her tears and flipped her hair back. Suddenly, she looked me straight in the eye and spoke clearly.
"...But Oppa."
"Y-yeah?"
"So, what exactly is this job you're doing? You should tell me, since we live together."
Meeting my sister's expressionless gaze, I felt a jolt of panic. I flinched and stammered out a response.
"It's... it's nothing much. I'm just tutoring some girls nearby... You know, Oppa was always pretty good at math, right...?"
"...Girls...?"
As she glared at me with eyes wide like a yandere, I broke into a cold sweat and waved my hands frantically to brush it off.
"...They're all nice kids, don't worry too much... Haha..."
I shoved the rest of my rice into my mouth, jumped up from my seat, and hurried out of the house.
I had told my worried sister that they were "all nice kids" to put her at ease, but obviously, that was a bold-faced lie that was about 20,000 kilometers away from reality.
The landlord's daughter, Na-yeon, whom I had met so far, and her best friend, Ye-eun, were undeniably demonic delinquents.
Just looking at them brought back my past trauma, making my legs tremble, and their behavior was that of absolute thugs.
For two days now, those girls had been threatening me, forcing me to take off my pants, and playing with my private parts as if they were toys.
Of course, I was partly responsible for reaching climax because I couldn't hold back, but still...
Regardless, with things turning out this way, I was already filled with anxiety about the last person I hadn't met yet.
If she was Na-yeon's friend, there was no way she could be a normal person. She was bound to be another delinquent, or at the very least, someone who was messed up in some way.
That day, I was terrified as usual, carefully entering the passcode to Na-yeon's front door.
"...I-is anyone home...?"
Fortunately, there was a sign of life from the entrance today. Loud Korean hip-hop music, likely playing from a phone, was blaring from Na-yeon's room.
I approached cautiously and opened the door. Inside, I saw a girl with blonde hair wearing a mask, sitting demurely at the desk and looking down at her phone.
"...?"
Her face was incredibly small, so even though she was wearing the smallest size mask, it covered everything from just under her eyes to her chin without a single gap.
She was staring at me intently with cat-like, sparkling eyes peeking out from above the mask. It was a gaze that made it impossible to guess what she was thinking.
I flushed, swallowed hard, and spoke.
"...Um... so... a-are you Seung-hee...?"
When I was given a rough explanation last time, I was told the girl with yellow hair was Seung-hee, so it had to be her. Sure enough, Seung-hee just gave a silent nod.
But looking closely, unlike Ye-eun, who had tossed her skirt aside and unbuttoned her shirt to scratch her chest, or Na-yeon, who dressed in equally trashy, delinquent attire, Seung-hee was dressed neatly, like the most model student of the three. It was only after seeing Seung-hee that I realized their school uniforms actually came with neckties.
Judging by her posture—kneeling demurely while she waited—and her exemplary attire, Seung-hee at least appeared to be a model student on the surface.
The bright yellow blonde hair and the piercing in her ear were a bit concerning, but considering the others, I felt I could be generous enough to overlook that level of rebellion.
I felt a surge of joy, my heart beginning to race at the thought that I had finally met someone normal. I carefully closed the door and sat at the desk opposite her.
"...Hello, I'm Lee Jihwan, your new tutor... Did the other two not come today?"
Seung-hee tilted her yellow head, pondered for a moment, and then nodded.
She had been staring at me with those large eyes without blinking even once since I arrived. Feeling a bit burdened by her gaze, I looked away and muttered awkwardly.
"Umm... r-right... well, since this is my first time meeting you, Seung-hee, shall we start with a light test to check your level...?"
"...Yes."
At that moment, the mouth area of Seung-hee's small mask puffed out slightly as a thin voice escaped, and I gasped in surprise.
'...Has a student finally appeared who treats me with formal language for the first time...!'
Of course, Na-yeon had called me "Teacher" and used formal language occasionally since our first meeting, but that was less about actual respect and more about mocking me.
I felt inexplicably happy over such a trivial thing, scratching my head and smiling foolishly.
I was excited to pull the test papers out of my bag when I suddenly realized Seung-hee hadn't turned off the music on her phone yet.
I smiled sheepishly and asked cautiously.
"Hey, Seung-hee...? Since class has started, should we turn off the music now...?"
"..."
Seung-hee stared at me with those transparent eyes that were impossible to read, and after a moment, she replied in a small, obedient tone.
"...Yes, I will, Oppa."
"Right, thank you."
It was so natural that I didn't even notice what was wrong with her response for a while. Then, I suddenly realized she had called me "Oppa" instead of "Teacher," and I frowned slightly.
'...W-what, I got confused because it sounded like what my sister says, so I let it slide...'
'...Well, whatever, titles don't matter. If she uses formal language, I should be grateful...'
I rationalized it to myself, trying to suppress the ominous feeling crawling up from the depths of my chest.
Soon, Seung-hee picked up a mechanical pencil and began to struggle with the test paper I had handed her.
She furrowed her brows and started scribbling a few characters, but it was obvious at a glance that she didn't know what she was writing.
I sighed inwardly and shook my head.
'...Well, I was told all three of them had low academic achievement... But with this attitude, at least she'll listen if I teach her, right...?'
Thinking that, I took the test paper back and began to explain each problem kindly and in detail.
"...Alright, the first problem is a simple binomial expansion. When there's a square on the parentheses like this..."
However, since Seung-hee showed absolutely no reaction throughout my enthusiastic explanation, I glanced over at her.
To my embarrassment, she wasn't looking at the test paper, but was staring intently at my face with a devious, smiling gaze.
"...S-so, the square is applied to x and y, and 2xy is created...! D-do you understand now...?"
Feeling the pressure as if my heart were being squeezed, I finished my explanation hurriedly, almost like I was rapping.
Seung-hee tilted her head slightly toward me and replied in a sultry, almost whispered tone.
"...Yes, Oppa❤️"
"...Ugh..."
Overwhelmed by that peculiar atmosphere, I began to tremble.
Seung-hee smiled broadly at me, looking relaxed, and suddenly stood up slowly, pressing her skirt down demurely with her hands.
Then, she hopped toward me in her socks, hands behind her back, and sat down right on my lap in a face-to-face position.
The hem of her school skirt wrinkled, revealing the white skin of her inner thighs. The scent of the sultry perfume she had sprayed on her neck wafted out in rhythm with my heartbeat.

I stared, mouth agape, at Seung-hee, who had climbed onto me. Even in such a situation, she kept her back straight, maintaining a proper posture.
Of course, only her posture was proper; her expression had been "gone" for a long time. Even with the mask on, Seung-hee breathed heavily, her breath felt clearly, and she muttered softly.
"...Oppa."
"Y-yeah...?"
"...Did you see that photo of you last time?"
"P-photo...? What photo are you talking about..."
At that moment, I remembered Na-yeon taking a picture of my penis with her phone camera during our first meeting and sharing it with someone, and a chill ran down my spine.
Seung-hee narrowed her eyes like crescent moons, smiling deviously as her cheeks flushed red. I stammered, breaking into a cold sweat.
"...T-that's..."
"...So, I want to show you my photo too, Oppa."
Just then, Seung-hee muttered that out of the blue and pulled her phone out of her pocket.
She unlocked the screen, opened the Twitter app, and suddenly thrust the screen toward me, smiling with her eyes.
"...How is it? I'm cute, right, Oppa?"
On the phone screen held by Seung-hee, who was smiling brightly as she said that, was a selfie she had taken for her "rebellious" account in a bathroom, wearing only gray Calvin Klein panties, her chest exposed, and making a V-sign with her fingers.