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🕑 Added 2025-09-13 21:38:06 +0000 UTCEP.82 The Secret Only My Sister Doesn’t Know – 1
“Hmmm...”
It’s been a week since I slept with my oldest sister and mom.
Because everything was out in the open, we’d been able to have sex as much as we wanted.
But there was still one person I had to be careful around.
Sister Chaea was busy with work, so I rarely saw her,
but Sister Chaehee was at home fairly often.
Of course, I only needed to be careful with one person, so it wasn’t much of a hassle,
but I’d already decided to reveal the secret to her, too.
‘Should I just tell her outright?’
Chaehee noona has a playful and naughty personality.
With a sister like that, maybe she’d just laugh it off and accept it easily.
After all, it was with Chaehee noona that I first crossed the line with a family member.
‘Still, just blurting it out would be a bit awkward...’
Maybe it would be better to make it obvious from the start, like with Mom.
That way, there’d be no time for awkwardness-everything would be exposed at once.
‘Should I try to get caught, like I did with Mom...?’
With Mom, I called her into the room, blindfolded her in secret,
then called my sister in so she’d be forced to witness something lewd.
But with Chaehee noona, I couldn’t come up with a clear plan.
“Hmmm... not easy...”
At some point, simply revealing the secret had become a secondary concern.
Now, I was more focused on how to show Chaehee noona to my oldest sister and mom.
“Isn’t there some way...”
While I was pondering what to do about my sister,
the door opened and someone came in.
Creak-
“Master, is there anything you’d like to eat?”
It was Mom who came in.
It seemed she’d come to ask about the menu since it was mealtime,
but as soon as I saw her, an idea flashed through my mind.
‘Sometimes, it’s better to think together than alone.’
Mom and Chaerin noona.
It might be fun to plan how to handle Chaehee noona with these two beauties.
“Mom, is big sis at home right now?”
“Yes... she’s lying on the sofa on the first floor.”
“What about Chaehee noona?”
“She went out earlier, so she’s not home now.”
So right now, it was just me, my sister, and Mom at home.
No matter what we planned, Chaehee noona wouldn’t know.
“Mom, can you call my sister? I want to talk with both of you.”
“Yes, Master.”
Mom looked a little curious for a moment,
but turned and left the room to call my sister.
‘While we’re planning, I should also ask how they’ve been getting along when I’m not around.’
It didn’t take long for Mom to bring my sister back.
Soon, my sister came into the room with Mom to see me.
Creak-
“You called, Daehyun?”
“Yeah, sis. I wanted to talk with you and Mom.”
“What’s up?”
She looked curious, just like Mom,
and both of them looked at me, waiting for an answer.
“You know Chaehee noona, right?”
“Yeah.”
“I’m thinking of revealing the secret to her, like I did with Mom.”
“Like you did with Mom...?”
For a moment, my sister glanced at Mom.
Mom glanced back at her.
Maybe they were remembering showing each other their embarrassing sides a week ago,
or maybe they were thinking about the week of intimacy since then. Both had a strange look on their faces.
It was like they were enjoying a shared, embarrassing secret.
“Anyway, I wanted to hear your ideas for how to do it, and I have some questions first.”
“What do you want to ask...?”
“When you and Mom were alone this past week, how was it?”
“U-um...”
Both my sister and Mom blushed at the question,
as if I’d asked them to confess something they wanted to hide.
But my sister only hesitated for a moment,
then opened her mouth.
“We did what you told us to...”
“Tell me in a little more detail, sis.”
“Mom was next to me...”
That was unexpected.
A week ago, I’d thought my sister would make the first move.
“Hmmm... really? Mom, is that true?”
I looked at Mom as if pressing her for an answer,
and she nodded with her face flushed.
“Yes... Master...”
“How did you ask her to finger you, Mom?”
“Ugh...! At first... I just went up to her... and she asked me...”
It seemed she couldn’t resist the excitement of being fingered by her daughter.
She didn’t ask outright,
but it looked like she gave a lewd look and signaled what she wanted.
Mom must have approached my sister with a lustful intent,
and my sister noticed and fingered her.
Mom was the one who approached,
but in reality, it was as if she’d asked her daughter to finger her.
“Did you ask if she’d finger you, sis?”
“Yes...”
Both Mom and my sister’s gestures showed their embarrassment,
but they also seemed a little happy about it.
“Good job, Mom.”
That confirmed it.
Now, all that was left was to get Chaehee noona to share the secret like they did.
“So, moving on, what do you think is the best way to do it with Chaehee noona, sis?”
“Ah...! Chaehee likes to joke around, so how about teasing her with lewd jokes little by little?”
My sister, who’d been embarrassed, was flustered but still gave a pretty good idea.
“Hmmm... Lewd jokes, huh? That sounds good. Mom, do you have any ideas?”
“I-I do have something in mind...”
From Mom’s reaction, it seemed she’d thought of something.
Naturally, both my sister and I looked at Mom.
“Sometimes... just sometimes, I used to wonder... what if we got caught having sex by the rest of the family...”
It was a very Mom-like idea.
Having sex in secret and getting caught by the rest of the family.
She must have secretly gotten off on that fantasy.
“Did you think about that all by yourself, Mom?”
“Ugh... yes, yes...”
Mom hung her head in embarrassment,
but to me, it only made her seem more alluring.
“So when you got fucked in front of your sister last time, you liked it, didn’t you?”
“Ugh... y-yeah, I liked it...”
Mom confessed her lewd secret in front of her daughter.
I didn’t even need to check to know her panties were wet.
Thanks to that, I came up with a plan for Chaehee noona.
‘I’ll just combine both Mom and my sister’s ideas.’
First, tease her with lewd jokes,
then expose her most embarrassing side.
That was the next plan.
‘I’m already looking forward to seeing her reaction.’
One night, when the whole family was home,
Chaehee was quietly using her laptop in her room.
‘Mom and big sis are home today and tomorrow, right...?’
Chaehee felt a bit disappointed.
Honestly, she wanted to have sex with Daehyun as much as she wanted.
But with the rest of the family around, she had to hold back a bit.
Of course, even with everyone home, she’d sometimes sneak off to see Daehyun,
but their chances to have sex freely were limited.
‘If we do it in secret too many times... we might get caught...’
Chaehee remembered Daehyun’s intense sex.
Even with the rest of the family home, the pleasure was almost unbearable.
‘If... we got caught...’
Before she knew it, her panties were slowly getting wet.
The thrill of having sex in secret from the family was arousing.
She especially fantasized about getting caught in the act.
“Haa... haat...”
Of course, Chaehee didn’t plan to get caught on purpose.
But she couldn’t help but have those decadent fantasies.
For now, her panties were only a little wet,
but the juices inside her wouldn’t stop.
The more she imagined those shameful situations,
the more her juices seemed to flow.
“Ugh... should I go to Daehyun’s room...?”
She had two choices in this situation:
masturbate in her room without anyone knowing,
or go to Daehyun and ask to be held.
Usually, Chaehee chose to go to Daehyun.
Sometimes she’d finger herself alone,
but when she couldn’t resist her desire, taking her brother’s cock gave her a thrilling pleasure.
“Huu... huu...”
While she was lost in thought in her room,
she heard a knock at the door.
Knock-knock-
“Sis, are you asleep?”
“Huh...? N-no...!”
It was Daehyun who had come to her room.
The moment she heard his voice,
Chaehee felt a wave of joy rising from within.
“Can I come in?”
“Uh...! Y-yeah, come in...”
A moment later, the door opened and Daehyun entered,
and Chaehee’s mind was filled with fantasies of being taken by her brother.
