The Siblings' Secret
I was losing my mind. How the hell was I supposed to look at my older sister from now on? And why wasn’t she saying anything? Normally she never shuts up when she’s cursing me out.
I even found myself resenting her for staying so quiet. She should’ve told me to stop. She should’ve said enough. She should’ve asked what the fuck I was doing to my own sister. If she had just stopped me, I wouldn’t be suffering like this. She wasn’t an idiot—she had to have known. The way I touched her body was wrong. That I was lusting after her. That we had already crossed way beyond the line of innocent sibling play.
I stared down at my hands, still flushed red. Even after all the pain I’d caused her, the sensation of her body lingered on my fingertips. How soft she was. How elastic. How smooth. No matter how hard I squeezed my eyes shut to forget, her body kept flashing through my mind. How white her skin was. How sweet she smelled. The way her panties had hidden what lay between her legs… how dizzying it had been.
I rolled around on the bed, kicking my feet against the mattress. No matter how much I thrashed, thoughts of her kept rising up.
What if… she was too scared of me to say anything?
What if she’d been afraid that resisting would make me do something even worse? What if she’d silently hoped I’d be satisfied with just groping her and then back off? Guilt flooded my head until I felt like I was drowning.
Why did it come to this?
Kang Yunseo. We weren’t like this before. You were just my long-haired, dickless older brother. So why the hell am I losing my mind over you like this? No matter how pretty you got, no matter how beautiful you became, it never bothered me. I never felt anything. So why? Why… is my heart making me suffer like this?
I got up from the bed. I needed to see her. Whether it was to apologize or get on my knees and beg for forgiveness, I had to talk to her.
She wasn’t in the living room. She’d been lying there just a little while ago. She couldn’t have gone outside, right? I checked the entryway. Her favorite shoes were still there.
Is she in her room…?
I trudged over. Gulp. I grabbed the doorknob and swallowed dryly. I had no idea what to say or how to say it. I didn’t even know what I wanted to hear from her. I just knew I had to see her. But how? No matter how much I thought about it, I couldn’t figure out what kind of expression I should wear when I faced her.
My hand on the doorknob was shaking violently. Calm down. Just say whatever comes to mind. Can we talk for a second? Just for a bit. Just normal sibling talk like always. The kind of everyday conversation siblings are supposed to have.
“Nu—”
The moment I forced my trembling lips open—
“The little brother started touching her feet? No. Why would his hand go there after touching her pussy?”
“Did these two even kiss in the first place? Ha, if I knew this was going to happen I should’ve saved the spanking for later.”
????????
What… the hell?
Beyond the door, my sister was muttering the strangest things.
“Even if I want to write about touching her legs or feet, the pace has already gone too far.”
“But I can’t have them have sex already either. Ha, what do I do?”
I pressed my ear right up against the door. What on earth was she doing?
“If I don’t upload this time… the view count is going to tank.”
A sigh mixed with frustration. Between the hard-to-follow sentences, I caught the word “view count.” View count? Was my worst fear actually true?
Was she showing things that should never be shown to others and getting paid for it? The most private parts of her body that even I hadn’t seen yet. My sister couldn’t be doing that. Not my sister.
At the very least, I should’ve been the first one to…
I moved even closer to the door. Closer. Just a little closer.
Then—click.
Oh, fuck.
I’d forgotten I was still holding the doorknob.
“Kyaaak!”
Crash. The door flew open and I tumbled straight to the floor. My sister let out a piercing scream.
“Haa. Haa. Haa. Haa.”
She must’ve been startled—her breathing was ragged. My heart was pounding so hard it felt like it would explode.
What do I do, what do I do?
I couldn’t just stay face-down on the floor forever. I had to look up…
“………”
“………”
Neither of us said a word. I stared hard at the floor, but sadly there was no mouse hole to escape through.
“You… what are you doing?”
She spoke first.
“What are you doing? Hey. Hey! Are you deaf?”
She nudged me with her toes. Tap, tap. Like she’d found some kind of bug.
“Th-that is…”
I lifted my head, trembling. She was looking down at me with ice-cold eyes.
“Can’t you hear me? I asked what you’re doing.”
Think, damn it. Use your brain. Come up with at least some excuse that won’t completely destroy our sibling relationship.
“You’re the one making weird noises. I was going to the bathroom and I kept hearing stuff about legs and pussies and whatever.”
“Th-that… wait, were you eavesdropping on me?”
“Are you crazy? You were practically shouting so loud the whole house could hear. I was going to ask what you were doing and then I tripped in front of the door.”
“Ah, fuck…”
Even someone with a quick brain like hers seemed flustered. There was no reason for me to suddenly fall over in the house, after all. She didn’t suspect my ridiculous excuse.
Because you were doing something suspicious.
“Hey.”
“What?”
“You… can you keep a secret? You can’t tell anyone, okay?”
Her expression was dead serious.
“What is it?”
Please. Please let what I’m suspecting not be true.
“Haa… I didn’t think you’d find out.”
Find out what? What exactly did I find out? You really…?
She pointed at her laptop. There, a Word document was open with the cursor blinking.
“Sorry, but I’m not really following. What does this have to do with all the pussy talk?”
“You idiot. I wasn’t doing any weird pussy talk. The truth is… I write stuff online.”
“Stuff? You mean like web novels?”
“Yeah. That’s right. They say if you read your writing out loud, it’s easier to tell if it sounds awkward or not. So I was muttering to myself for a second… and it looks like you heard me.”
“Didn’t know you had a hobby like that. Guess my sister really mastered Korean after all.”
I felt relieved. It wasn’t what I’d been afraid of. My chest felt lighter.
“Bullshit. Quite a lot of people read it, you know? I get decent donations too.”
“Really? What’s the title?”
“……It’s a secret.”
Why was she suddenly shutting her mouth? We already knew it was erotica.
“I want to read it too and see how well you write. I’m curious.”
“Ah, no way.”
When I tried to approach her laptop, she suddenly grabbed me.
“Why not? It might help. I read a lot of novels too.”
“I said no. Later. I’ll show you later.”
“You’re acting like this even though I said it’s fine. It’s erotica, isn’t it?”
“How did you know that?”
“Because the only things I could hear were erotica stuff. Pussy this, legs that.”
“I wasn’t doing any pussy talk!”
“Okay, okay. Don’t worry. I won’t tease you. Let me take a look at my sister’s writing skills…”
“………”
“Wait… is this the title?”
It had to be. The file name at the very top of the Word document. It was painfully familiar. It was the novel I had secretly read in her room multiple times.
The title of the novel my sister was writing.
“What kind of story has a title like this?”
I pretended not to know, putting on an innocent act. There was no way I could admit I’d read incest novels—especially ones about a brother and sister.
“It’s… that kind of thing.”
“What kind of thing?”
“Exactly what the title says.”
“What kind of secret would siblings have? Are the whole family spies or something?”
“You’d know if you read it. It’s about siblings doing… that. S-sex.”
“Siblings? You mean actual blood-related siblings?”
“……Yeah.”
I already knew it was about a sister and her little brother.
“People actually like this?”
“……Yeah.”
I had even donated money to it. That’s what was driving me crazy. That I’d sent my own sister money. That I’d cheered her on while she wrote a story about a big sister and little brother rolling around together. That I’d gotten hard reading my own sister’s novel.
……Fuck.
“Haa. Well. If people like it, that’s good. Guess you’re a talented writer, sis.”
What was I supposed to say now? Keep writing that erotica? Fighting?
“Make sure you get up and stretch once in a while. Don’t just stare at the laptop all day.”
I should get out of here now. Her expression looked complicated too. I could apologize later. Or maybe it was better to just put off talking to her altogether. Far into the future. So far that today’s events would feel like a faint memory—something we could laugh about like, “Oh yeah, that happened once~”
“Well, good luck. I’m heading out.”
“Hey.”
She suddenly grabbed me.
“……What?”
“You said earlier that you’d read it once.”
“Uh, uh? No, I can read it next time. If you don’t want me to—”
“No. Read it now. I’m asking you.”
“Right now?”
“The truth is I’ve been stuck on the next part for a while. I can’t figure out how to write the rest. Read it and give me some feedback.”
“Then wait a second. I’ll go to my room, read it quickly, and come back. The title was The Siblings’ Secret, right?”
“No. Just read it here. It’s annoying to go back and forth. You can just tell me right away.”
“Ah… I guess that works?”
Click. Click.
“Here. Read.”
“Mmm.”
In front of my sister. In front of my own blood-related sister, I was reading the erotica she had written.
“Oh, so when you said siblings, it’s the older sister and younger brother?”
“Yeah.”
“The brother is muscular, and the sister has really white skin.”
“……Yeah.”
“The siblings even spank each other on the ass. The description is so vivid. It feels like it really happened.”
“………”
Fuck. I didn’t notice when I read it before, but this was clearly about us. What the hell was she thinking, writing something like this?
Of course, writers often put their own experiences into their work to make it feel alive, but still—
I have no idea how I’m supposed to react.
She really shouldn’t have asked me to read this. What did she expect me to do? Should I offer to fuck her next time so she can write better? Would that help?
“U-um.”
She called out to me.
“You… touched my leg before, right?”
“Ah, ah. Ah. Ah. Yeah.”
Fuck. Fuck. Fuck. Fuck. I thought we were just going to quietly move on.
“I want to use that in the story too. But look.”
She came closer. The mood felt strange. I instinctively tensed my toes like last time.
It’s just a novel. It’s different from reality.
Sad thoughts. Sad thoughts.
“It feels weird for his hand to go from her ass to her leg. I don’t know how to make it work.”
“Ah… isn’t that something the writer should figure out herself? I wouldn’t know.”
“You said you’d help me. Look. Here, he spanks her ass. Then he touches her p-pussy or whatever. Normally the next thing would be sex, right?”
“Then save the leg stuff for later.”
“But it’s better to write it while the feeling is still fresh.”
This situation was too much for me. It was a relief that she wasn’t showing any reaction, but it was still agonizing. Or was she doing it on purpose? To make me die of embarrassment. To drive me insane.