Masturbation Is Not a Sin
Masturbation is not a sin.
If it were, then most adults—men and women alike—would be sinners.
Still, the fact remained that things had grown awkward between us after my little sister caught me in the act.
Our daily schedules barely overlapped to begin with. After that incident, we could hardly even look each other in the eye.
“Haa…”
She wasn’t ignoring me outright, but her replies were curt. Short, cold, and distant.
I even considered apologizing after some serious thought. It felt ridiculous to apologize for something like that, yet I wanted to fix things between us.
But my little sister kept dodging me. Busy, tired, tomorrow, later—she threw out every excuse she could to avoid me.
We hadn’t shared a single meal together in nearly a week. The atmosphere had seemed fine at our last dinner, but afterward her attitude flipped again, leaving me completely bewildered.
“…Don’t tell me she’s actually sulking because I wouldn’t tell her the title.”
I’d gone over it a hundred times. 486 Ways to Eat My Little Sister. I’d rather bite my tongue and die than say that out loud. Even if my mouth were torn apart, I could never let those words escape.
Unfortunately, that was my conclusion—and reality.
“Haa… What the hell am I supposed to do…”
And because of that, a chain of frustrating problems followed.
As a so-called writer, I’d been blocked for ages. The main heroine—the most popular character in the story—was “little sister” Park Eun-yeong. Setting aside the fact that the model was literally my real little sister, I’d clearly been influenced by her more than I realized. Now that things were awkward with her, my writing had dried up completely. Worst possible situation.
“I can only coast on sex scenes for so long. I’m seriously fucked…”
I was out of inspiration. I scoured every incest-themed material I could find—erotic novels, videos, even comics. Since the genre itself was so niche, I found nothing useful today either. Watching the same stuff over and over did nothing; I already had most of it memorized anyway.
Lying around fiddling with my phone only made the frustration worse.
“Haa…”
I decided to get some fresh air. Maybe a breeze would spark something. I threw on the simplest clothes I could find and headed for the park near the house.
“Ugh… This is already annoying.”
Forcing myself past the laziness, I jammed my feet into my sneakers, stepped into the hallway, and stomped the floor a couple times.
“Huu…”
Just leaving the apartment eased the tightness in my chest a little. Dragging my feet, I walked to the elevator and pressed the button.
I stood there blankly staring at the floor numbers. Today it felt especially slow.
Then my phone chimed.
Please choose which version you prefer from the three attached files.
— Illustrator
Three illustrations arrived with the short message. They perfectly captured the style and colors I’d requested, each with slight variations.
Right then, the elevator arrived with a soft chime. The doors slid open, and inside stood my little sister, alone.
“Oh, you’re here?”
“……Ah, yeah.”
Her expression was lukewarm, nothing like my own relieved greeting. We just stood there facing each other without moving.
“Not even gonna ask where I’m going?”
I took a step forward. She took a step back, even though she’d already reached her floor.
“…You’ll do whatever you want anyway.”
Her voice was small and indifferent, yet it echoed loudly in the empty elevator.
“Hey, look at this.”
I wanted to break the awkwardness. We barely saw each other once a day, so I figured I might as well keep talking. I held out my phone screen.
“W-what is it…?”
“This is what I’m working on right now. Which color looks better?”
I flicked through the saved photos while asking. She stayed frozen in place.
“None of them appeal to you?”
“……”
“They all suck?”
“…So it was real.”
She finally spoke. It wasn’t an answer to my question, but at least the conversation continued.
“What was?”
“…That thing you asked me to do last time. That’s what this is, right?”
“Ah, yeah. I told you it was real. You still didn’t believe me?”
“……”
She pressed her lips shut again. The elevator doors closed behind us.
“Ah!”
“Oh, since it’s closed anyway, let’s go get some air together.”
“W-why would I! W-who said you could decide that!”
“Because I decided.”
I quickly stepped in front of her and pressed the button for the first floor. Thankfully, she didn’t throw a fit about getting off. The elevator carrying the two of us descended quickly.
“You’ve been coming home late a lot lately?”
“…I told you I’ve got a lot of work.”
“Ah, I thought you were avoiding me again.”
“……”
That probably wasn’t the best thing to say. The old saying about keeping your mouth shut if you want to stay neutral came to mind.
“Ah… So which one looks best to you?”
I held out my phone again, shaking it in front of her on purpose.
“Number two seems the best. What do you think?”
“……Then go with two. Why are you even asking me?”
She glanced at the screen, then looked back down at the floor.
“Still, your sense is better than mine, right?”
“…Hah! Th-then… do three instead…”
It was a plain, unflashy gray—almost the textbook choice for that outfit.
“Hmm… That your taste?”
“It’s just… s-safe. B-because… readers are gonna see it anyway… If it stands out too much, it won’t appeal to the general audience…”
Her voice trembled, like being alone with me made her uncomfortable. Still, I appreciated that she gave her honest opinion. And seeing her like this only made me feel more guilty.
“Hey, and also…”
“…Wh-what now, dragging it out like that…”
“No, it’s nothing big. Just, uh, whew…”
I scratched my head. The words “sorry for getting caught jerking off” refused to leave my mouth out of sheer embarrassment.
The elevator chimed.
“I-I’m getting off first.”
She bolted out the moment the doors opened on the first floor. I couldn’t help staring at her plump, jiggling butt as she ran.
“Whoa…”
The pale skin I’d seen that day, the defenseless curves—memories kept flooding back, making my head spin.
“Hey, wait up!”
I chased after her even though I had no idea where she was going. She just kept running.
“Hey! Hey!”
“Huu! Huu! Haa! Haa!”
I stayed right on her heels as she tried to escape. Reaching out, I grabbed her shoulder.
“Kyaa!”
The way she flinched and recoiled stung a little. I quickly moved beside her and wrapped an arm around her waist.
“Hey, let’s go together, okay?”
I held on tight while she kept trying to pull away. Panting, she shot me sideways glances.
“…Why’d you suddenly start running?”
“I-I didn’t… huu, haa… I just felt like running, that’s all…? A-and let go already…”
She smacked my hand off her waist. I didn’t let go, gripping the hem of her clothes instead.
“Ah… seriously… you’re stretching my clothes…”
She grumbled under her breath, lips jutting out, and walked ahead.
“Come on, walk with me. Yeah?”
“…We are walking together.”
“A little slower, more relaxed, okay?”
“…It’s already slow enough.”
Her legs were pretty long, but still shorter than mine. She stomped the ground with those shorter legs, clearly annoyed.
“You’re the one who said you wanted air, so why’re you clinging to me like this? It’s not like you’re taking me for a walk on a leash. Seriously… ridiculous…”
“Heh, heheh…”
“…Why are you laughing like a creep again.”
This was the longest conversation we’d had in a while. For a moment, it almost felt like old times.
“I just… like it.”
The cool breeze filled my lungs. Fresh air from outside tasted sweet compared to the stale stuff in my room.
“……Wh-what do you like… A-are you crazy…? Did you lose your mind or something…?”
“No, I haven’t gone crazy yet.”
“……”
This was rare free time for me. Normally I’d still be holed up in my room writing. Whatever the reason, taking a walk with my little sister felt pretty good.
“Ah, and like you said, I’ll go with number three.”
“…Do whatever you want.”
On impulse, I pulled out my phone and typed a reply with my left hand.
They all look great, but I have to pick one.
Personally, number two looks the best to me.
Please proceed with number three.
Thank you!
I hit send. I liked them all, but I respected her opinion and chose three.
The phone chimed again. Same notification sound, but this time it wasn’t mine.
“Not gonna check your phone?”
“Ah, I’ll do it later.”
I double-checked the email I’d already sent. Maybe because I typed with my left hand—there was a typo.
It’s number three.
Sorry for the typo. Please proceed with number three, not two.
It’s late—have a good night. Thank you.
The phone chimed once more. Again, it was hers.
“Still not checking? What if it’s something urgent from work?”
“…Ah, it’s fine!”
She snapped at me, then immediately looked like she regretted it.
“Why’re you getting annoyed? I just thought maybe you weren’t checking because of me. I’m fine, so go ahead and look.”
“Aish… Seriously, you nag about everything.”
She looked reluctant, but started rummaging through her bag. Her phone appeared in her hand, then quickly disappeared back inside.
“Ah, it’s… j-just spam.”
“Ah, r-right…”
But in that brief moment, I saw it.
