Chapter 18

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Translator: penny

Chapter: 18

Chapter Title: Younger Sister's Sex Fantasy

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...Watch your friend's boyfriend jerk off real good.

A system message filled my entire field of vision.

This time, the reward mattered, but the tip really caught my eye.

The info was censored, only giving me limited details, which felt a bit odd, but somehow I had no trouble reading it.

And damn, what a twisted fantasy. My younger sister seemed way more depraved than I'd ever imagined.

"...Ah, it's heavy, right? I'll get off."

She was breathing hard, her chest heaving dramatically, so I quickly lifted my hips and got off the bed.

"Kkh! *Cough*! Gah, *hack*! *Gulp*..."

I could see her forehead crease slightly.

But was it my imagination, or was she just pretending to be in agony?

"Was it tasty?"

"......N-No."

She was probably doing it out of habit without realizing it.

Like licking food off her lips while eating. She was licking my cum from the corners of her mouth the same way.

*Gulp*... Hnngh, haah...

I'd just dumped a load in her mouth, but my dick was still rock-hard and swollen.

That one ejaculation hadn't satisfied me at all.

*Hoo*...

I could just feed the Aphrodisiac from the reward to my younger sister right now and fuck her like a dog.

No, once she swallowed it, she'd probably climb on top of me and shake her hips like crazy.

But I couldn't bring myself to give her the Aphrodisiac just yet.

That damn tip kept nagging at me.

The system had laid out this perfect setup, even handing over the Aphrodisiac like it was begging me to fuck her, yet it threw in this seemingly useless Sex Fantasy info. It was suspicious.

I didn't trust the system 100%, but so far, its hit rate was perfect.

So it probably wasn't telling me something irrelevant... That's what I figured.

"Uh..."

I was torn on what to do.

The table was fully set, and knocking it over myself felt like too much of a waste.

"...Can I touch down there too?"

It was a stupid question, no doubt.

A naked guy and girl didn't need to ask something like that.

"N-No. Let's go now, okay?"

But right now, we needed exactly that.

And she refused again, as expected.

"Then doesn't that leave me high and dry? You sucked me off good and swallowed all my cum."

"...Th-That was because you made me!"

"So you'll do whatever I say?"

"Haa... Why are you like this... Huh? Aren't you sorry to Ju-hee?"

She brought up her friend and pulled the blanket over her body.

It was kinda cute, but her pointless resistance was also kinda funny.

"Why should I be sorry? She'll never know. You gonna tell Ju-hee we did this?"

"......"

There was nothing to feel sorry about.

It was just a casual one-night fling between a guy and a girl.

"...Still, yesterday too... and that call earlier... Haaa..."

She stammered incoherently.

She probably didn't even know what she was saying anymore.

"I'm not dating Ju-hee, and it's not your place to say anything, so what's the problem?"

"......Y-You did that with her... and you're not dating?"

She was just like her first impression.

Maybe still too young and innocent. Or a bit naive.

The sudden system window left me stunned.

I hadn't expected her Favorability to drop just because I said I wasn't dating her.

And the moment it dropped, a penalty would hit.

The thought made my body hair stand on end.

That's why it gave me the Sex Fantasy info. It clicked.

"...Wait."

I shook my throbbing dick up and down and quickly dropped to the floor by the bed.

This time, I rummaged through my clothes for my phone.

*Riiiing*— *Riiiing*— *Riiiing*—

Without a second thought, I called Shin Ju-hee.

— Oppa!

She picked up with a bright voice.

I yelled right away.

"Hey! Shin Ju-hee!"

— Wh-What!? What's wrong!?

I wasn't sure if this was the right move.

But letting her Favorability drop and triggering a penalty was definitely not okay.

"...W-Wanna date me?"

I was in a rush.

So I just blurted it out.

— ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠Uh, w-what...? You and me, oppa...?

"Yeah. You and me. Let's date."

I switched to speakerphone quick and climbed back onto the bed.

My younger sister was staring at me with wide eyes.

— That's so sudden...

Shit... I thought.

I'd fucked her easily yesterday, so I'd underestimated Shin Ju-hee.

"...You're not against it, right?"

Not even when I raped 'Mom'.

Not when I flashed my dick at 'Older Sister' and groped her.

Not when I drugged my younger sister with Sleep Inducer and tied her up.

I'd never been this tense.

— Of course not...

Her voice didn't sound displeased.

It was just the push-pull of guy-girl dynamics, her way of showing she wasn't that easy.

"I'll treat you right."

— ...We just met yesterday. Don't you think we should both think it over...?

I wanted to smash this tip-spewing system.

It kept pressuring me, and it was pissing me off.

"Think about it. I'll wait. But not forever."

— ......Okay.

A suffocating silence swept over us.

My younger sister clamped her hand over her mouth and stared daggers at me.

"...Still thinking?"

— Hehe... Not even a minute's passed, and you're already asking? You like me that much?

"Y-Yeah. I like you. A lot. I love you!!"

— *Giggle*... Hihihi... Sorry, just teasing. I like you too, oppa.

Yes! I clenched my fist tight.

"Haaa... You scared me."

I really thought my heart was gonna explode.

It still hadn't calmed down.

— You called out of the blue like that. I was more shocked!

"Really? Heh... Oh, someone outside is calling me. I'll text you."

— Okay! Text me!

The call didn't end right away.

So I waited three seconds and hung up first, tossing the phone into my clothes.

*Hoo*...

I'd panicked over the penalty and gone for it.

Her Favorability went up too, so no loss, but things got a bit more complicated.

"...Hey. I'm dating Shin Ju-hee now. You heard the whole call, right?"

"Wh-What does that... What does that have to do with anything right now...?"

"Uh... Um..."

She had a point.

Dating her friend and then hitting on my younger sister for sex ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠looked pretty bad.

"...L-Let's just get out already..."

Her fiery temper from yesterday morning had died down a lot.

And she didn't seem to hate our skinship that much anymore.

But her Lust toward me was still at 1.

The progress stopped at Favorability rising.

"...So I should just go like this?"

I shouted boldly instead.

I grabbed my raging hard-on to show her.

"J-Just do it yourself... Ah... This is really too much..."

My younger sister buried her face in the blanket.

If she really hated it, she'd have freaked out or run out naked. But she didn't.

*Step-step.*

My sweaty feet stuck to the floor with sticky sounds from earlier.

*Slap-slap-slap-slap.*

I started jerking off as I slowly approached her.

"Then watch. Watch your brother jerk off nice and clear."

"...Wh-Why do you keep doing this to meee..."

I grabbed her head buried in the blanket and yanked it up.

She resisted at first, then her head came up limply, and she stared at my dick.

"...Watch your friend's boyfriend jerk off real good. Got it?"

I wondered if I was doing something insane, but luckily, ‍‍‌‌⁠​​⁠‌​​‍​​‍​‌​⁠‍‌‍⁠⁠‌⁠‌‍‌‍‌‌‌‍⁠​‌​‌​‌‍‌‌‌⁠‍​​‌‍⁠‌‌⁠⁠she reacted.

"N-Nngh... Seriously..."

Pretending she couldn't help it, pretending she hated it, pretending it was wrong, pretending she was suffering—she scanned my dick with her eyes while doing all the acts.

"Ah, aaah..."

A string of drool stretched from her slightly parted lips.

The sticky saliva dripped down her chin, and she wiped her mouth with the back of her hand in surprise.

"What? Wanna eat it again?"

Her innocent face had turned slutty before I knew it.

Her tongue poked out between her lips like she was smacking them.

"Hnngh... It'll get on your face. Open wider."

"......Th-This is really the last time. Promise you'll leave after."

"Yeah. Hurry."

"......Ah, aaa~"

My younger sister looked mesmerized by my furiously shaking dick.

Her eyes glazed over, her mouth parted slightly, and she stuck out her tongue long.

*Slap*! *Slap*! *Slap*! *Slap*!

My hand sped up, electricity jolting up my spine.

My heels lifted automatically, toes curling every which way.

"Hngh! Haa... Gonna cum now... Your friend's, hngh... boyfriend, haaah... is gonna dump a huge load of cum in your mouth!!"

I spewed shit I'd never say normally and thrust my hips forward.

I shoved my dick into her slightly open mouth.

*Spuuurt— Spppuuuurt—!!!*

Thick stuff erupted from my urethra.

It started filling her mouth to the brim.

"Hngh, *gasp*! *Gulp gulp*, *hack*! *Gulp*."

Too much cum to swallow straight down her throat—it spilled from the corners of her mouth.

My younger sister cupped her hand under her chin to catch the dripping cum.

"Haaah...!"

Her tongue lapping at my glans nearly made me pass out.

The leftover cum dirtied her mouth further, then got cleaned by her tongue.

"Hngh... Fuck..."

The immense satisfaction made my hips tremble on their own.

Especially her hazy eyes looking up at me. That was the best part.

"*Hack*! *Cough*! Gah, *hack*!"

I grabbed the back of her head, pressed it to my crotch, and savored the afterglow of my orgasm.