Miyu told me not to eavesdrop, so I went down to the living room on the first floor.
It's not like I want to hear the sounds from upstairs, but I'm sitting on the sofa without even turning on the TV.
No, would it be more accurate to say that I was absentminded?
It was about time that the cool air of the air conditioner circulated around the room, clearing my mind up.
Since my parents come home late, I don't come into the living room often until night.
After we returned, Miyu and I went straight to our room, so the living room had still absorbed plenty of heat from the sunlight.
We have a rule that the shutters are to be raised in the morning, but since we don't have a habit of closing them when going out, this room is just heated every day for no reason at all.
"Fuuh..."
I lie down on the sofa and exhale loudly.
Ever since I received an erotic image of my little sister's friend, Yuka, I can't seem to calm down.
A raw photo of a junior high school girl pulling up her disheveled uniform and exposing her boobs.
I repeatedly press the button on my smartphone to open and close it.
While my libido was accumulating, it wasn't enough for me to take off my underwear yet.
Unlike Miyu, Yuka is a complete stranger to me.
I know it's crazy that it's harder for me to let one out to a stranger than to my little sister, but this is just my instinctive standard of value. I can't help it.
I'm sure that letting one out to my little sister's friend is not that different from watching an AV.
Still, if she found out that her friend's older brother was using her as fap material without her permission, she would probably get angry if she wasn't even compensated.
"Haah."
My heart beats faster as I sigh uncontrollably.
Even though I tried not to think about it, my body was etched with guilt due to the fact that I had used that photo to bust a nut.
How much time has passed since I tried to rest and calm my racing mind?
I don't know, but in the end I couldn't sleep as due to my palpitating heart and overbearing stress, so I moved to the kitchen.
Drinking some coffee should calm me down a bit.
With that in mind, I set up the coffee maker and sat down with my back facing away from the kitchen.
The only sound echoing in the living room was the erratic sound of coffee being boiled.
When I closed my eyes, only that pleasant sound occupied my hearing, that alone easing my nervousness.
However, it was only for a few minutes that I could be enveloped with such comfort.
My ears, completely alert, picked up the sound of the living room door opening, and my heart was once again forced to beat loudly.
"Nn-! I'm already tire-ed!"
It was an unfamiliar voice, but from its lively sound I knew right away that Yuka had come to the living room.
After that, there was only the sound of the door closing, and it seemed that she had come down to the first floor by herself.
I had told Miyu that I was in the living room.
Miyu would have tried to avoid her from running into me, so she probably sneaked out, saying she had to go to the restroom or something.
Yuka seems to be bothered by the study/punishment session, and it doesn't look like she'll be going back for a while.
Things just got complicated.
Even though it's already awkward with my little sister's friend.
The girl I used as fap material is lying on the other side of the kitchen.
It's a pain to stand up, but I'm worried that the sound of the coffee maker would catch her attention.
If you don't want the other person to be suspicious, say hello first.
I stand up and look across the kitchen at the junior high school student.
Yuka, who was wearing a uniform, had her feet pointed my way.
Her knees were bent, and the inside of her skirt was completely visible.
And in it.
"-?!"
Like a prairie dog that had discovered its natural enemy, I quickly hid.
Shit.
I saw something I shouldn't have again.
No, but.
Why, just why.
-Why aren't you wearing panties!?
I could distinctly see the crack due to the lighting hitting it well.
The place where hair has starts to grow is definitely an important part for a woman.
I had seen Miyu naked before, but I had never witnessed the view from below so clearly.
What do I do.
If I call out to her now, she'll find out that I've seen her important place for sure.
Fortunately, she didn't seem to be bothered by the sound of the coffee maker.
If on a whim she happens to come to the kitchen.
She asks me why I was hiding.
Maybe I should make a more understandable noise to get her to notice.
If I can explain in a natural way that it was just a coincidence I didn't know she came into the room, Yuka might realise it on her own and close her legs.
It's better to just pour my coffee without worrying about anything.
It would be unreasonable for me to claim that I didn't notice the sound at the door, but since we didn't know each other, there was nothing strange about not calling out to her.
It's fine.
Business as usual.
I spend my day in the living room thinking there's no one there but me.
"Yuka, you were here after all."
Following the rattling sound of the door opening, a familiar voice came in.
As soon as she entered the room, the sound of footsteps moved to the sofa.
Miyu had come.
Nice timing.
"You're not in a position to slack off, are you?"
"Come on! After you did something like that, of course I'm going to slack off!"
I hear the sound of banging on the sofa.
Does that mean Miyu took a photo of Yuka's breasts?
"It's not okay that Yuka shows no remorse at all, you know."
"Because I don't know what's wrong. Even if you ask me to remember, it doesn't make sense. It doesn't make sense that punishment is studying."
"Are you sure you don't know? Or do you just not want to admit it?"
"Ug-!"
Yuka lets out a strained voice and relaxes as she lets out a breath.
"Well, it's not like I don't have a few ideas on my mind. If Miyu just asked me to apologise, I'm going to obediently hear you out, okay? But, of course, when Haruka's not around."
It was a dissatisfied voice.
The atmosphere was friendly and fun, but it was a little unpleasant.
An indescribable feeling of anxiety spreads within my chest.
"Hey, Miyu too. Why don't you stop listening to what Haruka says? I understand that you owe her a favor, but no matter how you think about it, it doesn't suit Miyu."
Yuka advised Miyu in a strong tone.
Have you finally decided to listen?
After all, every girl has this kind of thing.
They seem to get along on the surface, but behind the scenes something else is going on.
I thought she was cheerful, bright, and didn't have any dark side to her.
Is this what she's like in reality?
I can't see any reason to be hostile towards such a polite and cute girl.
She has such a privileged appearance that it makes you feel jealous. I can understand that.
Even so, you're friends, right?
What kind of terrible things did that girl do?
"I mean, come on. She's the kind of girl who stuffs egg vibrators in herself during exams!? No matter how you think about it, she's crazy!"
I'm sorry for doubting you, Yuka.
That is definitely way too crazy.
Wait.
I can't believe it.
Is such an innocent girl really hiding an egg vibrator and wetting her pants while she's taking a test at school?
She looks as cool as a doll, mixes with her classmates, is watched over by her teacher, but only her vagina is being dominated by other emotions...
If you think about it, that's extremely perverted behaviour.
Despite wearing such a serious face, she's too bold.
It's pretty quiet during the exam.
I wonder if they haven't found out yet.
"Yuka. Don't say anything unnecessary."
Miyu's voice suddenly became cold.
Perhaps it was because of Haruka's insults.
Or maybe...
"Onii-chan is in the kitchen, after all."
"Eh!? Seriously!?"
Miyu realised my presence as I thought, huh.
I mean, did Yuka really not notice?
"H-Hello."
I muttered my condolences in my heart as I stood up and met Yuka's gaze.
"Ahahaa-. H-hello."
Yuka flutters her hands and makes a stiff smile.
After all, she just exposed Haruka's terrible secret to me.
I'm sure there will be additional punishment for this.
"I-I'm sorry!!"
Yuka ran upstairs to escape the piercing gaze of Miyu.
I don't think the situation will change even if she runs away, though.
I was left behind, alone with Miyu again.
Today's atmosphere is just getting more and more awkward.
The air seemed to freeze for about a minute before Miyu came around to the kitchen.
With a look of displeasure on top of displeasure.
Miyu glared at my swollen crotch.
"This is, um, yeah."
It's impossible not to get excited.
I can't believe that Haruka, a beautiful, serious-looking, doll-like girl, is indulging in lasciviousness amidst more than thirty people.
The image of Haruka, face down on the desk, suppressing her voice in agony, flashed in my mind.
There are probably times when she can't stand it anymore and wants to touch it.
Does she wipe her chair with a tissue when she gets up?
No good.
My fantasies can't stop.
"Onii-chan."
My fantasies were interrupted by the low voice of Miyu.
Haruka was the only one I was told not to use as fap material, and in return I received erotic photos of Yuka.
I want to hold back too, but I'm sorry.
It's impossible now.
"...Was she really like that?"
I asked, ignoring my accusing sister.
I don't want to criticise her.
I thought that if I could explain the situation properly, my selfish fantasies would stop.
Miyu came in front of me, looked me straight in the eyes, and opened her mouth.
"Don't get the wrong idea. Haruka does it because it helps her concentrate the most. Ever since she was in elementary school, she's been the best in her grade at both school and cram school."
That's amazing.
There are so many things that are way too amazing about this.
Genius and pervert really were two sides of the same coin.
"I did indeed back away when she handed me the remote control though."
Miyu looked away and muttered.
You blurted out something unnecessary, little sister of mine.
You must have been really taken aback when that happened, huh.
"Well, I'm sorry for making assumptions. Is she also doing something like that on the second floor?"
I ask, nervously nervous.
My mouth was dry and I swallowed my saliva.
I thought I could speak without biting, but Miyu just glared at me and didn't respond.
Silence is affirmation, so it's all alright, right?
If that's the case, it makes sense why Yuka wasn't wearing panties.
And so, it wouldn't be strange if they had some serious skinship.
Their relationship is so close to the point where she can take off her bra without any problem.
"Could it be that Miyu likes girls?"
Even Miyu has such good looks that the boys in her class won't ignore her.
However, even now she hasn't had any male presence around her. Meaning, she doesn't actually swing that way.
In response to my pile of questions, Miyu narrowed her mouth as if they were difficult to answer.
But this time, she replied properly.
"I don't feel that way. Haruka is a lesbian though."
The sigh in her voice reveals her true feelings.
She doesn't seem to have any sexual preferences.
"Is that so. Since you protected her secret so much, I thought for sure..."
"I'm not going to tell you why. Just forget everything about Haruka."
Miyu kneels in front of me again, welcoming me to this scene for the second time today.
"You're not allowed to be horny anymore today. I'll take care of everything, so if you have any left over, just cum it out."
As Miyu rushes me, I hesitate as to whether I should take my pants off. Even though I was excited, I didn't feel like busting another one out.
It would be nice if there was a little more atmosphere, but since Miyu isn't in a good mood, I feel like she would just be more depressed.
"That's going to be difficult right now."
"Even though it's gotten this big?"
"Sorry."
Those words alone stung me in the crotch a little.
"You have a photo of Yuka. Use that."
At Miyu's command, I look at Yuka's erotic images again.
Men are not so simply structured as to be able to ejaculate on that basis alone.
"Muu..."
I'm not going to cum even if you show me such a sulky face.
Although it's much better than the scary face from earlier.
I stood there without even zipping down my pants.
In the meantime, Miyu continues to be troubled and a few minutes pass.
Miyu bowed her head one last time and stood up with a determined look on her face.
"I'll get ready, so please wait."
Miyu returns to the living room and begins rummaging through the drawers looking for something.
I think that area was where I kept my sewing tools and stuff.
"Preparing for what?"
I asked, but of course she wouldn't tell me.
"I'll call for you when I'm ready. Until then, don't think about anything naughty."
Miyu sticks a nail in me just like that.
She grabbed a white cloth and nylon tape and went upstairs.
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