Little Sister, Don't Use Me as Your Fap Material! ~Operation to Capture the Perverted Brother-Sister's Special Fetish Girl~

Chapter 11: Beautiful Girl M / The Sign Is T

“Alright then, let’s begin the Midorigawa Kaede Conquest Operation! Yaaay~ Don don paff paff!”

Three days after attaching the GPS to Midorigawa’s loafer.

In my room after school, Madoka and I were holding a strategy meeting.

Sitting on my bed, she spoke with unusually high energy.

“You seem way too cheerful for someone whose life is on the line.”

“Hey, being all gloomy won’t solve anything. Might as well enjoy it! If you’re gonna be an idiot anyway, you might as well dance!”

When an actual idiot says it, the line somehow gains more persuasiveness.

Yeah, being positive really is the best in life.

“You’re right. Even as a virgin, ‘you might as well jerk off’!”

“Onii-chan, doesn’t saying that yourself make you feel empty inside?”

“So, was attaching the GPS worth it?”

“It was! It was totally worth it! I’ll explain the results right now!”

“Yeah, go ahead…”

“…Hey Onii-chan, I don’t think you’re listening to me at all. What exactly are you doing?”

Madoka glared at me with clear displeasure as I sat at my desk staring at the PC screen.

“Hm? It’s fine, it’s fine. I’m listening to you with one ear.”

“Don’t listen to a conversation about your little sister’s life with just one ear! What are you even watching so intently?”

“Of course, I’m watching Mochizuki Ayane’s live stream. Is there a problem?”

“There’s a huge problem! Pay attention to my story!”

“I am. I’m watching the live stream while also listening to you.”

“Why is the sexy actress’s live stream the main focus and your little sister’s life-or-death situation just a side activity!? Is the content of this stream really that important?”

“Yeah. Today they’re announcing the tracklist for Ayane’s first cover song album that’s coming out soon.”

“That’s completely irrelevant! My story is losing to some worthless announcement!?”

“What do you mean ‘worthless’!? Don’t make fun of her challenge to please her fans through more than just AV! She’s working hard in many different fields for us fans! Support this diligent and admirable girl!!!”

“My brother really is the epitome of a sexy actress stan…”

“Plus, Ayane always does her live streams in a miniskirt, so sometimes you get real-time panty flashes♡ Ah! Look, just as I said — there it is! Uhyohyo, today it’s pink♡”

“My brother’s eyes are sparkling at a sexy actress’s ‘fashion panties’… This is getting pretty rough…”

Tap tap tap tap.

『Ayane-tan, you’re as cute as ever today♪ Those pink panties are way too erotic! Such a lewd Ayane-tan is definitely becoming my fap material tonight♡ I’m gonna jerk off a lot to you♡ I love you, Ayane♡♡♡』

“My brother is happily typing gross long comments on a sexy actress’s live stream… I really didn’t want to see something this bad…”

“…Onii-chan, are you even planning to listen to me?”

“Of course I am, but Ayane’s panty flash is also important~”

“Onii-chan, you really are obsessed with panties… Can’t be helped. Guess I’ll have to use that strategy…”

Madoka let out a loud, deliberate sigh directed at me.

She stood up on my bed, leaned her back against the wall next to the bed, and sat back down facing me.

Naturally, this position thrust her lower body toward me.

Then, she spread her bent legs wide apart.

Her pure white panties were now fully visible between her boldly spread thighs.

This was what is commonly known as an “M-shaped leg spread.”

A girl in school uniform, sitting on her brother’s bed with her legs spread wide and panties completely exposed.

That was the current state of my little sister, Aoyama Madoka.

“How is it, Onii-chan?♡ Don’t you think a super beautiful active JK’s M-shaped open-leg full panty view is way more worth watching than some sexy actress’s ‘fashion panties’ on screen♡?”

Tap tap tap tap.

『Here’s a haiku: Ayane-tan, show me your panties, Clemens♡』

“If you have time to write lame comments, then look at my panties!!!”

Can’t be helped. It’s my cute little sister’s request.

I’ll take a good look at her proudly displayed panties.

I stood up, walked over, and sat down right in front of the perverted girl doing an M-shaped spread on my bed.

“How is it, Onii-chan? My panties are erotic too, right?”

I stared at her fully exposed crotch beneath the pleated skirt.

Her plump thighs were squeezed by black over-knee socks.

This emphasized the “absolute territory” of bare skin between the socks and panties, along with the pure white fabric, making the contrast strikingly vivid.

The black fabric tightly constricting her thighs.

The thin white fabric that faintly revealed the skin tone and slightly dark pubic hair beneath.

And bridging the two — the healthy, plump, moist skin of an active JK.

“Yeah, Madoka. Your M-shaped open-leg panties are insanely erotic.”

“Way better fap material than some sexy actress’s fashion panties, right!”

……

“Yeah, you’re right.”

“What was with that pause just now?”

“Anyway, let’s officially begin the strategy meeting for conquering Midorigawa-san.”

Still sitting in the M-shaped spread with her panties fully visible, Madoka continued speaking in that position.

“Onii-chan, do you understand our fundamental goal?”

“To find the perverted girls with abnormal fetishes hidden in this school and train them to become my personal onapets… Is that about right?”

“Of course not! Our goal is to conquer the Spell Masters — girls with abnormal sexual fetishes — and obtain Aninael Antibodies.”

“Even if you say ‘conquer,’ what exactly are we supposed to do?”

“Today’s objective is to directly witness Midorigawa-san in the act.”

“And then what? Should I just creampie her on the spot?”

“No, idiot! I’m going to activate my superpower ‘Sexual Fetish Exposure: Melt Down’ to learn her ‘climax conditions.’”

“What the hell are ‘climax conditions’?”

“For a Spell Master to release Aninael Antibodies, simply cumming isn’t enough. They need to reach a climax where their Sexual Power Spell hits 10,000. The specific requirements to reach that state are called ‘climax conditions.’”

“What is a ‘Sexual Power Spell’ in the first place?”

“It’s like an indicator used to identify Spell Masters. A beautiful girl whose Sexual Power Spell is constantly over 8000 is a Spell Master… Think of it like the sexual version of battle power from manga.”

“…I kind of get it. So, to learn Midorigawa’s ‘climax conditions,’ we need to see her in the act. Are we planning to break into her house?”

“No. To put it bluntly, she doesn’t do it at home.”

“What? Not at home? Then don’t tell me she does it inside the school?”

“That’s not it either. I stalked— I mean, observed her at school, but there was no significant fluctuation in her Sexual Power Spell, so she doesn’t do it at school.”

“Then where the hell does Midorigawa do it?”

“Based on the GPS data you planted, I stalked— I mean, investigated her after-school movements. It turns out her Sexual Power Spell rises during the ‘blank one hour’ on her way home from cram school.”

“Where does she go during that ‘blank one hour’ to cum?”

“There’s an abandoned building on the outskirts of the entertainment district near the station. It looks like she does it there.”

“An abandoned building?”

“Yes. So we’re going to get there first and lie in wait for her!”

“…Still, you have zero hesitation about barging in on someone having sex.”

“My life is on the line. I don’t have the luxury of being picky about methods. I’m prepared to do anything except actual crimes!”

You’ve already committed quite a few crimes by this point…

“By the way, can I ask one thing?”

“What?”

“Well… When we see Midorigawa in the act, as a healthy teenage boy, I think it’ll be way too stimulating for me.”

“This is why virgins are such a pain~”

I tried to be vague by saying “healthy teenage boy,” so you didn’t have to spell it out.

“It’s not a problem.”

“Do you have a plan?”

Please bestow your wisdom upon this pitiful monkey.

“There’s a beautiful girl right in front of you doing an M-shaped spread with her panties fully visible. Just use her as fap material, jerk off, and clear your head before we go.”

What I received was not wisdom, but a stupid, lewd suggestion.

“Here, Onii-chan. You can jerk off as hard as you want using your little sister’s M-shaped open-leg full panty view as live fap material♡”

A real JK in a real school uniform…

The texture you can never get from AV cosplay — the realness of it.

That same uniform, now with legs spread wide in a full M-shaped position.

A current JK’s pure white panties spread out right before my eyes.

Indeed, the sight of my little sister in front of me was incredibly erotic.

It was already plenty erotic as it was, but desire knows no bounds. As a man, I couldn’t help wanting to take it even further on this once-in-a-lifetime opportunity.

“Hey Madoka, I have one request… Fuhihi♡”

“…What?”

Whisper whisper whisper

“Eh…? You seriously want me to do that?”

“Yeah, I seriously want it♡”

“Jeez, you’re unbelievable! Asking your own little sister to do something like this — Onii-chan, you’re seriously done as a human being!”

“Don’t be so cold. Think of it as a reward for listening to your long explanation♡”

“You really are just a horny monkey whose brain only thinks about jerking off… Haa~ Fine, I’ll do it! I’ll do it!”

With her cheeks slightly flushed, Madoka moved her right hand to her shorts.

She pinched the front fabric of her panties between her index and middle fingers and pulled it upward hard toward her navel.

The thin strip of fabric dug tightly into her pussy lips, causing soft, puffy “pussy meat” to bulge out on both sides.

As the white fabric area decreased, her pubic hair — which had been hidden — peeked out messily from both sides of the white strip.

Because the panties were wedged deeply into her slit, only her hole and clitoris remained covered.

Precisely because they were hidden, my imagination ran wild, and a strong libido screaming “I want to see” numbed my brain.

The “T” shape Madoka had created by pulling her panties tight into her crotch.

This was the completed form of a “T-front” — not quite a T-back.

“Making your little sister do something this embarrassing and stupid — don’t you have any pride as a brother!?”

Even while wedging her panties into her pussy lips, she still complained.

“I have no pride! I threw away something worthless like that the moment I was born from Mom’s womb!”

“This guy was already this desperate from the moment he was born… His resolve is way too strong…”

“Come on, show your embarrassing crotch to Onii-chan better♡”

I leaned my face in close and peered between her legs.

My gaze was drawn to the puffy pussy meat bulging on both sides of her slit, emphasized by the wedged panties. My breathing naturally grew heavier.

Haa— Haa— Haa— Haa—

My hot breath made the “protruding hairs” sticking out from her panties sway and dance.

That sloppy, stupid-looking “protruding pubic hair” was unbearably arousing♡

Madoka has just the right amount of slightly thick pubic hair that I like, so instead of just a few strands, a bold, messy bush is sticking out — which is incredibly hot♡

“Jeez, Onii-chan! Don’t bring your face so close! You’re seriously gross!”

“…That said, it looks like a faint stain is starting to form on those panties. Or is it just my imagination?”

“Y-Y-That’s—!”

Sniff sniff. “Also, I feel like the ‘female scent’ is getting stronger. Is that my imagination too?”

“~~~///”

“Well? Madoka?”

“…Aah, fine, I admit it! I’m a perverted girl who gets excited when her brother sees her in such an embarrassing position! I’m pretending to hate it, but it’s just to hide my embarrassment. The truth is, I’m a lewd cunt who’s happy to have her ‘pussy-lip-wedged protruding-hair T-front panties’ seen up close by Onii-chan! Please use my wedged panties, my pussy meat, and my protruding pubic hair as fap material and jerk off happily! There, are you satisfied now!!!”

Aah, Madoka… You really are the best, most erotic and adorable little sister♡

I pulled down my pants and underwear in front of her.

Boing.

My swollen cock sprang out vigorously.

“Uwa… It’s still ridiculously big as always…♡”

She tried to complain, but the moment she saw her beloved brother’s cock, Madoka’s eyes were already filled with ♡.

I had already reached my limit, so I started stroking hard right away.

Stroke stroke stroke stroke.

“Onii-chan is jerking off full force using me as fap material♡ Such insanely fast hand movements… If it wasn’t me, I’d be grossed out♡”

While keeping her panties wedged in a T-shape, Madoka stared heatedly at my stroking hand.

Madoka’s raw panties♡

Madoka’s raw pussy lips♡