"I don't mind if it's with Onii-chan."
With moonlight shining through the room, on the bed in the middle of the night.
She places her hand on her crotch and spreads her private parts open.
Her silver hair falls onto the pillow while her moist eyes stares straight into mine.
"Miu... Miu...!!"
My burning, throbbing cock got harder and harder as I continued rubbing it with my right hand.
My genitals were being stimulated by the 4,000 Hz sound waves striking my ears and the array of 4 million pixels in front of me.
That seductive, beautiful girl is my precious lover.
"Onii-chan... nn... a-aah!"
Miu's body had not yet known a man. Her body writhed in agony as her vagina was pried open.
She is the one and only angel who never betrayed me.
"Hah... it feels so good... Miu..."
"Onii-chan, you can't... If you go that roughly... aahh...!"
"Miu... I love you... I can't hold it in anymore...!"
"Onii-chan? Are you there...?"
"Ah... Mi... u...?"
"Onii-chan?"
That voice came from behind me.
The direction the door of my room is at.
I thought that my family, whom didn't care about me at all, would suddenly choose to barge into my room.
"NuoaAHHH!? Mi-Miyu!?"
My real sister, different from the one shown on the display, was standing there.
Right next to my exposed lower body.
"I-It's not what it looks like! This is not what you think it is...!!"
I couldn't decide which to hide - the screen showing a sex scene with a virtual little sister, or my genitals, which was getting erect from excitement, causing me to repeatedly flap my hands.
"It looks to be the case no matter how I look at it, though."
Miyu looks down at my cock with a straight face.
Its moist, shiny glands were bulging, indicting that it would have had ejaculated soon.
"I'm sorry for disturbing you. I was behind your back so I didn't notice."
"I-is that so."
"She's cute, isn't she."
"Yeah..."
Miu's desperate moans leaks out of the headphones, making the atmosphere even more awkward.
The audio, which is played independently of the text, continues to play despite the Auto function being turned off.
"Were you about to cum?"
"T-that's... kuh... not wrong though..."
"Huh. I see."
My sister said in a calm voice and looked down at my penis once again.
Her big eyes remained unfazed even while staring at the engorged penis.
That glossy skin and black hair seduces me as if ignoring our blood ties.
Her breasts so thick that they fit in the palm of her hand and her toned body... I wonder who in the world those were created for.
And when did she even learn about male masturbation?
Miyu and I aren't particularly close, and since I'm a shut-in, I've hardly ever had a conversation with her.
Therefore, I don't know what kind of youth Miyu is living.
Even so, she's always had a sour look on her face.
She's never had any male presence around her, so I thought she would remain innocent forever.
To think that such a younger sister had known a man before I knew it.
"Shall I help you out as an apology?"
"Ah, sure ...Sure???"
What the hell did she just say.
"Then, please excuse me for a moment."
Miyu walked in front of me, picked up the mouse, and bent forward while standing.
She unplugs the headphone jack from the computer and turns to me to see if I'm ready.
Her pure white legs peeking out from her culotte pants are so sexy.
...Wait. Wait just a minute.
Why am I lusting after a three-dimensional woman? Even worse, my own sister?
"Haahh... Onii... chan...! So rough... aahh...!!"
Click, click, Miyu continues progressing through the game.
After waiting until all the text was displayed and Miu's voice finished speaking, she carefully clicked each page one by one.
...Eh?
That's all?
"Shouldn't you be moving your hands?"
Miyu asks naturally.
I have so many questions I can't sort them out.
Does this little sister of mine not think it's anything much seeing her older brother masturbate?
"Should I wait a little longer?"
"Ah... yeah."
Feeling like I was being urged, I instinctively put my right hand on my penis.
While staring at my little sister's sexy thighs.
Is this even okay?
I can't believe I'm fapping to my real little sister right in front my 2D lover sister.
A double sense of guilt looms over my chest.
"Aah..."
Without realising it, I was holding back my breath.
My right hand slowly started to move to pump out semen again.
"Ah... Kuh..."
Because I was taking small, half-hearted breaths, my voice was mixed with short moans.
My eyes were glued to my younger sister's legs, ignoring the fact that Miyu was politely clicking through the dialogue.
I had never observed a girl this closely before.
I thought there was nothing in the real world that could match the excitement of what was in the 2D world.
Oh no.
My erection hurts more than usual.
I want to move my hand faster.
"Uh... Miyu... um..."
"Hmm? Are you gonna cum?"
"Ah...It's just...I don't have a place to cum onto..."
I want to cum on her thighs.
Feeling this excited, I don't want to grab a tissue, and I don't feel like throwing it on the floor.
"Since you're helping out anyways..."
If she's feeling apologetic...
Just one time is fine.
I want to experience cumming on a girl.
"Let me cum on Miyu's thighs...!"
I said it.
That look on my little sister's face is fueling my sexual desire even more.
I have no choice but to admit it.
I'm horny for my little sister.
I'm masturbating to my blood-related little sister.
"Eh, that's a no."
My sister refused with a straight face.
"Ehh..."
"Don't give me an 'ehh'. Spraying semen on your little sister is just disgusting."
I-I don't understand this girl's standards...
"You're going to cum onto a tissue, right? Here."
Miyu handed me a box of tissues that was always kept next to my desk.
Ah, I see. This is reality.
"How do you usually cum onto it?"
Although my sister knows that men drain semen onto tissues, she doesn't seem to know exactly how they do it.
What an unbalanced level of knowledge she has.
There's no reason not to take advantage of this.
"I usually hang it on a drawer and cum onto it there."
I've never done that even once, though.
"I see. Your hands are full while clicking."
Miyu was fully convinced.
There is an Auto function, but let's keep quiet about that.
"So, if you're willing to help, I'd appreciate it if you could hold up a tissue for me."
"Is that so? Is it okay if I just sit in front like this?"
Miyu sat flat on the floor, grabbed a piece of tissue with both fingers, and laid it out in front of my penis.
It's obviously thin enough to penetrate, but this is my opportunity to strike.
I'm prepared to cum on Miyu and get scolded by her for that.
A chance like this would never come again.
"Then, I'm gonna cum."
"Okay."
I click the mouse with my right hand and resume masturbating with my left.
Miyu doesn't question the change in hands and continues staring at my penis as it regains its hardness.
Even if you spend money at a store, you won't be able to easily find a scene like this.
A cute younger girl is watching me masturbate right in front of her.
I was sure.
I would cum twice as much as usual.
Then I would cum on my sister and make her body sticky with my cum.
"Aahh... Mi... Miyu..."
Taking advantage of the fact that Miu and Miyu have similar names, I rub my rod while saying my little sister's name out loud.
It didn't matter whether Miyu noticed or not.
I haven't been paying attention to the game audio for a long time now.
Miyu is looking at my penis.
Every time Miyu blinks, the sense of realism resonates in my lower abdomen, making my cock grow even bigger.
Miyu stares at the tip of the glans of my penis.
The obscene liquid finally comes out, and point of climax becomes apparent to me.
"Ah... Kuh... Miyu... I'm gonna...!"
The ejaculation was approaching the point at which it could no longer be stopped.
Whether I let go or continue holding the base, I can't change the future where I ejaculate right in front of my sister.
"Miyu... I'm cumming... I'm cumming... ahhh...!!"
I immediately switched to my right hand and stimulated my penis with all my might.
So that a larger amount of semen would be ejected.
So that the semen would be ejected more powerfully.
I can feel something hot passing through my urethra.
As expected, the semen that flew out broke through the tissue and stained my sister's body with its genes.
"There's... still more..!"
There's no way it could end with just one shot.
Throb after throb, waves of semen reverberated out of my urethra. Semen continued flowing from the tip where the spasm had subsided.
"Ugh... come on. You came too much. It got all over my clothes."
Cloudy white, viscous liquid was splattered all over Miyu.
She scoops the semen up from her cheek and glares up at me.
I got scolded as per normal.
It felt like that wasn't really the point though.
Wrapped in a pleasant feeling of fatigue, I didn't even listen to half of what she was saying.
After that, there was an awkward feeling of distance between us for a while. To be honest, it had always been that way, so nothing had changed - but one day, after a few days had passed...
An unforeseen situation had befallen me.
"Haah... Miu... Miu...!"
As soon as I got home from school, I confirmed that my sister wasn't home and started playing the H-game again.
"Fuck... haah... shit... why...!"
No matter how much I rubbed my penis, I couldn't feel the sensation of impending ejaculation.
Even though my penis was so hard and excited.
My favourite scene didn't help.
Using lotion also didn't help.
Lastly, I even took out my onahole, which had been sealed away for a long time and stimulated myself as much as I could. In the end, I was getting tired and losing my hardness.
I know the reason for this.
It's Miyu.
After giving Miyu a bukkake, for the past few days, I could only cum one time.
By using my little sister as fap material.
I must confess that I couldn't even hold it in for one minute as soon as I started rubbing it off.
It felt so good to masturbate with Miyu as my fap material.
The amount of semen that came out was so large that it couldn't be caught with a tissue.
"What am I doing..."
Feeling impatient and empty inside, I stopped moving my hands.
Apparently, it's bad for your health to stop without cumming, but it can't be helped in a situation like this.
I washed the lotion off in the sink and went downstairs to take a bath.
"Oh. You were here this whole time, Onii-chan."
Miyu was resting on her back on the sofa in the living room.
Holding a manga in her hands, she seemed have been reading it for quite some time already after returning home.
I didn't realize that she had come back because I was trying so hard to cum.
That was dangerous.
If I was seen by her again...
What would I have made her do afterwards?
"Yeah."
I respond in a socially awkward way as usual.
She really just talked to me normally after something like that had happened.
I had been assuming that she was avoiding me, but now that I think about it, she had never slandered nor made any crude remarks about me.
"...What... manga are you reading?"
I mustered up the courage to talk to her.
I took a can of juice from the fridge and rested my back on the leg of the sofa.
"A supernatural mystery story called Half Game."
"Woah."
I couldn't keep the conversation going because it was a manga I didn't know.
I've read a lot of manga over the years, so I was confident that I'd have plenty to talk about.
It seems that what is necessary for conversation with people is not just a wealth of topics.
The silence continues. Seeking solace, I take a sip of my canned juice.
As I placed the can on the table and leaned back against the leg of the sofa, it suddenly caught my eye.
(Uniform skirt and bare legs... so sexy.)
I thought 3D was shit.
Even, I always stared at the female students passing by the street.
No matter how addicted I am to 2D, my body is honest.
As proof of that, my crotch, which should have completely lost its energy, was pitching a magnificent tent.
(Oh no... If she sees it, she'll find out...)
I can't stand up and move, and it would be unnatural to change my position so that I can hide my crotch.
More than anything, the vile feelings that had grown inside me wouldn't allow me to escape from this place.
(I want to jerk off...)
My cock, which should have withered due to exhaustion, was now painfully erect again.
I guess this is what they mean when they say they're "about to burst".
It wouldn't be strange if a blood vessel had actually burst.
Even though I'm only average-sized, my penis feels magnificent right now.
The panties visible through the gap between my little sister's thighs were extremely erotic.
Even though I see underwear in the laundry every day.
"Miyu."
What the hell am I doing right now.
"What?"
Miyu replies while reading her manga.
Even though we didn't come into direct contact with each other, she was the little sister who helped her older brother masturbate.
There was something semi-convincing about that.
"Can I let one out here right now?"
Hearing those words, Miyu finally turned her gaze towards me.
Towards the top of my tent, supported by my swollen penis.
"I don't mind."
She curtly responds and gives the OK.
Miyu starts reading her manga again.
Though, despite receiving permission, I hesitated when it came time to take off my pants.
Unlike last time when my privates were already laid bare, this time I had to expose them myself.
At the same time, it was an act that officially recognised that I saw my little sister as a sexual object.
I used to be a 2D believer until now.
I can't believe I would fall so easily just by being seen masturbating one time.
"Then, I'm going to start."
First, by taking off my pants.
It would have been easier to take my underwear off too in one go, but underwear over an erection are also quite provocative.
Miyu sensed my movements and glanced at my crotch, but her attitude didn't seem to change.
Full consent.
I don't have to worry anymore.
I took off my pants, exposing my son enshrouded in lust.
Just exposing my genitals in front of my little sister made my heart jump in pain.
I stare at Miyu's legs while holding my erect cock.
It wasn't long before my hands started to move.
"Haah... haah... ahh..."
I don't think my voice would come out if I was alone.
For some reason, when I'm with Miyu, I can't hold back my breath.
"Hey, Miyu."
It feels so good that my head goes crazy, making the pleasure even more intense.
"Can I touch your legs...?"
Touching a girl's body.
That's something I've never experienced before.
As someone who denied the third dimension, that was something I had always considered taboo.
"That's a no."
I was flatly refused.
I see.
If that's the case, I'll visually rape you to my heart's content.
I'm already using my little sister as fap material and masturbating to her.
What's more, in front of the person in question.
Oh no.
Until just now, no matter how hard I tried, it wouldn't come out.
I want to cum so badly already.
"Fuuh... ufuu... haah..."
The glans of my penis, turning bright red from gathering blood, sends a signal to me to ejaculate quickly.
While sniffing the smell of her legs without hesitation, I was so excited that I didn't know what was going on anymore.
"Ah... Miyu... tissue..."
There's no place to cum on.
She refused to let me cum on their thighs, and she also didn't want it to get on her clothes.
If I just cum in the living room, the semen will stain the carpet.
"Miyu... I'm already... gonna cum..."
That was a semi-forced request.
I didn't mean to get tissues ready.
I let out those words, hoping that Miyu would somehow be able to deal with it.
"Hmm? Is it coming out? What should I do. The manga is borrowed, if it gets dirty I'd have to pay extra, you know."
She's acting like it's someone else's problem.
Even though she's being fapped to.
The fingers of my right hand begin rubbing the back of my penis strongly, and it's slowly becoming more and more unbearable to hold back.
I don't want to have to keep looking for tissues and disposing of them.
I want Miyu to take care of it.
Just like that time.
I want to ejaculate while Miyu is watching.
"Miyu. I'm sorry, please put down the manga and take it."
I stood up and vigorously rubbed my penis in front of Miyu, who was lying on the sofa.
Miyu seemed to sense that there wasn't much time before I would cum.
However, her response easily exceeded my expectations.
"Nn..."
In a nasal voice, Miyu tells me, "Please cum here.''
It seems that Miyu misunderstood my intention for her to take it with her hands like a plate.
Miyu's mouth opened and was waiting for me to ejaculate.
Her red tongue, wet with saliva, covered her lower lip, ready to drink the cum.
"Haah... guh... Miyu...! I'm cumming... I'm cumming...!!"
I ejaculate into my little sister's mouth.
The level of guilt I felt when I could no longer control myself from ejaculating was nowhere near compared to last time.
I felt something thick running through my urethra again, and the cloudy white, viscous liquid poured straight into Miyu's mouth.
"Ah... nnh..."
Miyu was surprised as expected, and her eyes stiffened slightly.
Because of the illuminating lights in the living room, I could see her pink mouth smeared with veiny strokes of semen, dripping straight down the back of her throat.
"Just a little more... cumming...!"
Squeeze out every last drop.
Semen was pooling in her throat, blocked by the back of her tongue.
Confirming that my ejaculation had stopped, Miyu grimaces as she swallows my semen down her throat.
"Ugh... it's bitter... So this is semen."
Miyu glares at me while complaining.
So she didn't know the taste of semen.
There are many girls who don't like ejaculation in the mouth.
However, judging from this response, Miyu isn't the type who can't drink it.
If that's the case, that means she's never had this kind of experience in the first place.
Does this girl really only have the knowledge but never knew about men?
I wonder if she's ever had a boyfriend.
"Hey, Miyu."
"Hmm?"
I stroke the glans with my sticky fingers.
"Just the tip is fine, so can you clean it for me...?"
I want to touch that mouth even for just a moment.
If things go well, she could even give me a blowjob while cleaning-
"I don't wanna."
Miyu picked up the manga again and turned away to the other side.
It didn't seem like she was in a bad mood, though.
I don't really understand her criteria, but I'm grateful for a clear refusal.
It's much more troublesome to be disliked without knowing it.
"...I see. Um, can I ask you something?"
"What?"
Miyu responded while looking at her manga.
"Don't you hate drinking semen?"
"Not really."
Miyu still has an expression-less face.
I wonder why.
I get overly excited.
"It doesn't seem to have calmed down yet. If I let one out again, would you drink it...?"
No one likes persistent men.
Even though I knew that, I thought that unless she really didn't want to drink it, I should have been able to ask her.
"Sure."
Miyu turns the page of the manga and takes a glance at my still hard penis.
"It's fine until mom and dad come home."
My sister replied curtly.
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