"Cum."
Miyu declared that with her face right in front of my cock.
She got down on both knees and grabbed my waist, making me feel like she was about to give me a blowjob, causing it to arch upwards even more.
"If you ask me to cum, I'll cum, okay."
It was the first time I had been asked for it.
While I do feel happy, I also feel confused.
Miyu sometimes gets angry at me and has even shown disgust towards me, but she has never hated me.
However, for that reason, I had never felt affection from her even once.
When I met a girl named Haruka and tried masturbating to her, Miyu interrupted me and immediately begged me to ejaculate.
I don't know how to interpret this.
"I won't forgive you if you have any thoughts about Haruka."
Miyu looks me with a piercing sharp gaze.
There was an unusual amount of emotion in that sentence.
"I got it."
After acknowledging her statement, Miyu placed her hands on her knees as she sat straight on the floor.
"Very well."
Miyu said so and fell silent.
In front of my little sister who was sitting straight and staring at my glans, the movements of my gripped hands slowed down.
If you take my masturbation that seriously, I'm not gonna be able to concentrate though.
I tried sliding my hand along with all my might, but it was extremely difficult to make it feel good.
I need some stimulation.
Because Miyu asked for it.
I'm not asking you to show me your boobs.
If you could at least sit down like a girl and give me a glimpse of your thighs, I'd be thrilled.
Miyu continued remaining silent.
Just twitching and blinking.
I could almost hear the birds singing in my silent room.
Even the sound of my dripping sweat was as deafeningly silent as this.
"-Haruka, if you use Miyu's stuff without permission, she'll get angry you know."
"I won't use it, I'm just looking."
"Ehh, I wonder. I'll tell Miyu about it later."
"Miyu doesn't get angry at me no matter what I do. Don't forget that we're having a study session today in order to teach Yuka."
I could hear the girls playing through the wall.
As far as I know, there should have been only two girls named Miyu and Haruka, but the voices coming from next door were clearly a conversation amongst two people.
"Did anyone else come?"
"Just Haruka and one other person. Her name is Yuka. ...Are you not going to let it out?"
I nod my head in response to Miyu's question.
Maybe she doesn't want to waste time because she doesn't want to keep her friends waiting.
Normally, it would be no problem to get it out in just a few minutes, but there was just so much new stimuli causing my mind to become cluttered.
"It may be difficult to do it quick."
"I see. Hmm."
Miyu put her hand over her mouth and thought for a few moments.
"Hold on for a second."
Miyu slowly stood up and left my room.
While I'm standing naked from the waist down.
Emptiness envelops my whole body.
Should I just sit on the bed instead?
Just as I was thinking about this, another voice from the next room reached my ears.
"Ah, Miyu! Listen! Haruka was using Miyu's thing without permission!"
Her voice sounded energetic.
I'm sure that Yuka is a bright and adorable girl.
Partly because I knew Haruka's appearance, my brain has decided that since she's Miyu's friend, she must be cute.
"I wasn't using it, you know. I was just touching it."
"That's practically the same thing, isn't it? Hey, hey, is it really okay with you, Miyu? Come on, scold Haruka."
What in the world are they talking about, I wonder.
Putting my ear against the wall, my lower part was once again stiff.
It wasn't a particularly erotic conversation, but my instincts seemed to be in a completely different place than my thoughts.
I'm really curious about how Miyu talks to people aside from me.
I wonder if that Miyu is still able to smile a lot when she's outside the house even if she's always wearing a sour look on her face.
"It's time to stop studying, huh... ...wait, hi-Miyu!? What are you doing!?"
There was a rumbling sound of something falling onto the floor, as well as someone collapsing near the wall.
"Don't worry. Just be quiet."
"I-idiot! I can't be quiet when my clothes are being taken off! The button is going to break...! "
There was the sound of the futon rubbing against the wall.
"I never heard that you were gonna go this far! Not my bra! Don't take my bra off!"
"Miyu, I've never heard of you doing this kind of stuff either."
I don't know the voices of the two other than Miyu, but I can guess by the way they speak and the atmosphere.
It seems that Miyu is doing something bad to Yuka.
She made me wait and took her friend's bra off...
What does this mean?
Does this mean she'll give it to me?
No no no.
She got mad at me for simply using her friend as fap material.
But, I'm sorry Miyu.
My erection hurts.
"Pull your camisole up by yourself. Hold still, okay."
"Ugh... this kind of punishment, it's too harsh..."
Click, click, I hear the sound of the shutter.
Looks like she's taking a photo.
I don't know what kind of bad things this Yuka girl has done, but how she can be so ruthless to her friends?
Or did she bother Miyu to the point where Miyu wouldn't forgive her?
"What are you going to do with that?"
"Hmm. For personal use."
"What about my photos?"
"Don't need them."
After that conversation, it became quiet for a while.
I hear Miyu open the door.
There seemed to be an ongoing argument in whispers on the bed through the wall.
"Thank you for waiting."
Miyu came back to my room as if nothing had happened.
With her smartphone in hand.
This little sister of mine had brought back something incredible to me.
"Did you hear all that?"
Miyu asked when she saw me near the wall.
"Sorry."
"This time it's fine. I'll send you the photos, okay."
"You're gonna give it to me!?"
"You can use it as many times as you want."
After Miyu finished operating her smartphone, my smartphone vibrated loudly on my desk.
When I peeked at the screen, one photo had indeed been sent.
I unlock my simple lock and open the attached image.
On the dimly lit screen appeared the image of a girl wearing a disheveled uniform, causing my heart to jump.
As the downloading spiral rotated and the progress bar at the bottom advanced, my urethra twitched and tightened.
"Wow..."
My hands trembled.
Catching my eye was a photo of a junior high school girl in the room next door.
She blushes her cheeks and, while looking away, grabs the hem of the camisole herself, exposing her chest.
Her brown twintails hung gracefully from her shoulders, and pink buds were peeking out from her undeveloped bulge, completely contrasting those of Miyu's.
Although Yuka was short in stature, she was a girl with a good figure and smooth features.
Having the same dignified eyes as Miyu, her strong-willed face was contorted with shame.
Because the photo was taken forcibly, her whole body wasn't well-captured, but it also emphasizes the vividness of the photo.
"How is it?"
Miyu asks in an expression-less voice.
"Is this really okay?"
"Yeah."
"Didn't you hate me using your friends as fap material?"
"...There are a lot of circumstances."
Miyu lowers her eyes.
A pose saying to not pursue the matter.
"Then I won't hesitate to..."
I focus on the screen and start moving my right hand.
The photo itself is erotic, but the thought of this naked girl being in the next room makes my balls clench with a sense of immorality.
The boobs of a schoolgirl with her uniform partially exposed.
The things that I thought could only be seen in 2D were now in my hands.
"No... this is... as expected..."
Even though it was sent by Miyu, my real little sister is watching me masturbate to an erotic photo of her friend.
It was so impure and immoral that my ethics didn't matter anymore.
Even this small bulge must be soft to the touch.
I wonder what kind of voice she would make if I touched her breasts and licked her as she turned away in embarrassment.
Not only that.
I want to rub my penis against that white skin and smear it with the pre-cum overflowing from my tip.
Yuka's skirt had its pleats messed up because she was forced down.
If I fuck her, she'll probably moan really loudly.
Glaring at me with those determined eyes of hers while her lower body loses to pleasure and cries out for my cock.
Such a sight comes to mind.
"Ah... aah... uaah...!"
I want to let it out.
While raping this girl in my mind.
I want to fill her with my semen.
"I'll drink it so it doesn't overflow. Just let it out."
Miyu's voice brought on a rush of pleasure, as if my prostate had been stimulated.
"Haah... I'm cumming... I'm cumming...!"
My eyes flashed, semen flowing down my urethra.
My muscles tightened as if squeezing down on my hard cock even more, and my consciousness faded due to the momentary pleasure from when the semen flew out.
"Ah... Miyu... I came..."
Even though my right hand was pulling down my upwards-twitching cock, it didn't seem like I was able to hold it down properly.
I feel like I fired it quite spectacularly, but I wonder if she was able to drink it without it splattering everywhere.
If it got on her clothes, I might be scolded again.
I take my eyes off the screen and check Miyu's face.
"Nn... are youw fwinished...?"
Miyu keeps her mouth open and exchanges gazes with me with her eyes upward.
She had about half of my cock in her mouth.
Of course, there was no way she would let me touch her tongue or lips, though.
It seems that she didn't grab my waist probably because she didn't want to disturb me in the midst of fantasizing.
So, she probably judged that unless she got close enough to take my entire glans in her mouth, she wouldn't be able to properly catch all of my semen.
"Miyu, um, can you keep the semen like this for a little..."
"Nn... gulp... haah, I can't do that, Onii-chan."
Miyu swallowed my semen and immediately sealed my words.
What difference is there between licking off the semen and leaving it there after going so far?
I just wish I could finally be freed from the emptiness of wiping my own penis.
"You feel refreshed, don't you? Then, Onii-chan, you have to thank your little sister for what she's done for you."
"I guess you're right."
I did get some raw fap material from her.
She even disposed of my semen for me.
"Now then, this is an order from your little sister. From now on, you must wear headphones. I will get angry you overhear us."
Miyu pointed to my headphones, which I had left unattended for a while since I stopped playing eroges.
"I understand. But it's fine as long as I stay in the living room on the first floor, right?"
"If you move as quick as possible, I'll allow it."
Miyu said sharply and left my room.
I didn't feel like wearing those headphones anymore.
(T/N Note: I changed a few of my definitions and terminology in some chapters. e.g. "Let it out." -> "Cum.")
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