Chapter 46: Test Subject
Translator: RaidenTL
Chapter 46: Test Subject
The next day. Morning.
The items I ordered from the Point Shop arrived in a package at my front door.
Thud.
"Whew, this is pretty heavy."
I sliced the box open with a utility knife.
Inside were various items, starting from birth control pills to adult products with several special effects.
Everything was purchased from the Point Shop, but the one I was most excited about was the wireless vibrating dildo.
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Special Wireless Vibrating Dildo.
From gentle stimulation like a tickle to intensity so strong your eyes will roll back.
NO charging. NO malfunctions. NO hygiene concerns.
Vibration intensity can be controlled by syncing with the app.
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A simple explanation.
Since it was a Point Shop purchase, I liked that I didn't have to worry about realistic issues like mechanical failure.
But this wireless vibrating dildo...
Just how effective was it?
"I want to see how good it is."
I couldn't contain my curiosity.
As luck would have it, there was someone in the house perfectly suited for a preliminary test.
—Hey. Come to my room.
I sent a text to Seo Ji-yu immediately.
Five minutes later, the door swung open.
"Ugh, why are you calling me again?"
Entering the room with a dissatisfied pout, she sat in a chair and swung her legs.
Ignoring the rebellious glare from my younger sister, I replied nonchalantly.
"Don't you need some pocket money?"
"I mean, I do... You want me to get you off?"
"Yeah. That's why I called you."
"You perverted bastard."
After shooting me a sharp look, she immediately climbed onto the bed and tried to pull my pants down.
Grab.
"You don't need to use your mouth or hands today."
"Then what? You want a footjob?"
"No. I'm going to masturbate."
At my words, she spoke with a flat expression.
"What? Then why did you even bother calling me? Just watch some porn and do it yourself."
"I have a favor to ask."
I stroked Seo Ji-yu's long black hair.
She looked up at me with a face that seemed slightly creeped out, then pulled my blanket around herself as if to protect her body.
"What is it today?"
"There's something I want to test out. Help me."
"Something you want to test?"
I showed the vibrating dildo to Seo Ji-yu.
Upon seeing its long shape, she made a bizarre face that didn't match her pretty features and immediately started kicking my legs.
"Kyaak!? You animal!"
"What? You know what this is?"
"How could I not? It's an adult toy!"
Seo Ji-yu stared at me in horror.
Seeing my sister recognize the object's identity at a single glance, I tilted my head.
"Have you ever used something like this?"
"Are you crazy? Why would I use something like that?"
"Then you can try it today."
Before using it on the members, I needed to test the effects on my sister first.
Our parents weren't home anyway.
"Hey. Take off your pants."
"Ugh, you're a literal beast... What are you doing to your own sister?"
"I'll give you pocket money."
"...Then at least 100,000 won."
"Depends on how you do."
After a long struggle, we finally reached an agreement on the money. Seo Ji-yu shot me a glare and began to pull off her dolphin shorts.
Her slender, long legs—maintained through regular yoga and stretching—were revealed.
As expected of someone called an Instagram goddess, her body was insane.
She was tall with long legs, giving her great proportions. Add to that her well-maintained, silky black hair and the pretty face that made her a social butterfly at university.
I slowly scanned her body.
"85 points."
"Why are you grading me, you psycho? And why am I only an 85?"
"I'm a girl group manager, remember?"
I tapped Seo Ji-yu's calf, signaling her to spread her legs.
Seeing that, Seo Ji-yu asked with a cocky look in her eyes.
"But what does this have to do with your sexual release?"
"Because I'm going to masturbate while watching you."
"...Ha, seriously annoying."
Seo Ji-yu spread her legs slightly.
I could see her neatly groomed mound and the pussy nestled between, glistening with moisture.
"It's a bit wet, but it'll hurt if I just shove it in, right?"
"Obviously. Don't you have any lube?"
"I don't have that."
Instead, I placed my hands on Seo Ji-yu's legs.
She looked at me with flustered eyes, but as soon as I began the massage, she obediently surrendered her legs to my touch.
And so, the massage began.
I firmly and refreshingly rubbed her bare legs, which boasted the beautiful lines of an SNS star.
"Ngh... what is this?"
"Does it feel good?"
"You're actually kind of good at this. Where did you learn to massage?"
Even my arrogant sister nodded as if acknowledging my skills.
I chuckled and moved my hands to her calves, the core of her leg lines. From there, I pressed down with my thumbs and kneaded her feet.
[Lewd Touch has been activated]
"Not bad, right?"
When I asked while pressing between her toes, Seo Ji-yu closed her eyes and nodded. It seemed the massage really did feel good.
Before long, the glistening moisture on her pussy increased.
"Ah..."
Seo Ji-yu had her eyes closed with a languid expression, as if she had soaked her feet in warm water.
Taking advantage of her lowered guard, I aimed the tip of the dildo at her hole.
Rub, rub.
"Ngh..."
"I'm putting it in."
"Just finish as fast as you can..."
Looking at my sister's face as she opened her eyes half-lidded, I slowly pushed the tip of the vibrating dildo inside her.
Squelch...
There was a bit of resistance, but it went in once I applied pressure.
A long, wide ring-like part at the base of the dildo prevented it from falling out or sliding too deep inside.
"Agh..."
Seeing Seo Ji-yu's face already furrowing her brows and holding back moans, I asked.
"What? You're feeling it already?"
"Shut up and just jerk off quickly..."
Speaking in a cocky voice, Seo Ji-yu hurried me by tapping my crotch with her foot.
I lowered my pants and began to shake my dick in front of her.
"Spit on it."
She spat for me, and I used it to stroke my dick even harder.
While jerking off, I simultaneously tapped the dildo lodged in her pussy.
"How does it feel?"
"...It feels like shit."
"Watch your mouth."
Seo Ji-yu was known as a pure and innocent star on social media.
But to me, her older brother, she was just a cocky and rude younger sister.
I continued to shake my cock while scanning Seo Ji-yu, who was spreading her legs and looking at me with sharp eyes.
"Haah... haah..."
Seo Ji-yu's expression was starting to look strained.
It seemed difficult having something shoved inside her pussy; I could see sweat trickling down her forehead.
Occasionally, whenever she reflexively tightened her pussy, I could see the dildo twitch.
"You look like you're enjoying it."
"I'm not... hngh..."
"Want to make a bet?"
At the mention of a bet, she looked at me.
I continued speaking while stroking my dick.
"Let's see who goes first. If you win, I'll give you an extra 50,000 won. If I win, I take 50,000 off."
"Fine..."
Seo Ji-yu nodded with a confident face.
She probably didn't think she would reach a climax just from having the dildo inside her.
However, there was a fact she didn't know.
"That thing has a vibration function."
"What? Wait a sec—"
Leaving the panicked girl behind, I opened the app and operated the synced vibrating dildo.
Vvvvvvvvv...
"Ha, ahngh...!"
Twitch, twitch.
Her body convulsed slightly.
I started the vibration intensity at a level that felt like a light tickle.
As the dildo buried deep in her pussy emitted a light vibration, she closed her eyes and her expression gradually turned lewd as the stimulation rose.
If I posted that expression on social media, the views would explode.
"Th-this is cheating..."
"You should have asked beforehand."
I replied shamelessly while observing her reaction.
"Mmm... haat..."
Seo Ji-yu closed her eyes and twitched.
Since the vibration wasn't that strong yet, she was holding out quite well.
If I were to use this dildo on the members later, this intensity seemed just right.
Endurable, but definitely stimulating.
"Haat... haang..."
Feeling Seo Ji-yu's moans grow sweeter, I immediately cranked the intensity all the way up.
VRRRRRRRRRRR—!
"Hngh...!? Kyahut!"
Her moans changed instantly.
At the much stronger vibration, Seo Ji-yu let out a stupid-sounding "Guh-huk" and arched her back.
Then, she began to spray hot fluid from her pussy.
Looking closely, the long, plug-like ring at the end of the dildo was also stimulating her clitoris.
"St-stop...! Hngh...!"
The pure and pretty face of the sister worshipped as an SNS goddess distorted in an instant, consumed by a filthy pleasure.
"I said stop...! Ngh-hngh...?!"
"You look like you're having a great time."
I kept the vibration going.
It didn't even take five minutes for my sister's pretty face to crumble under the relentless vibration of the dildo.
A moment later, with her legs wide open and her toes splayed, my sister sprayed a fountain of fluid.
Sploosh!!!
"Haaaaah...♡"
With her eyes rolled back, my sister climaxed pathetically while spraying water.
Watching her, the urge to ejaculate hit me rapidly as I jerked my dick, and I grabbed her chin.
"Open up."
She instinctively opened her mouth, and I filled it with a thick load of semen.
At first, she reflexively frowned at the sticky sensation, but once she tasted my semen, she stuck out her tongue and swallowed it down greedily.
"Mmm... gulp."
After receiving a cleaning blowjob from Seo Ji-yu, I immediately pulled the dildo out.
I looked at the dildo, soaked through with her vaginal fluid, with satisfied eyes.
I felt like I had made a good purchase.
Imagining the members wearing these remote-controlled vibrating dildos while dancing on stage later made my dick throb with power again.
And for that to happen...
'I need to collect more points.'
That day, I came in Seo Ji-yu's mouth a total of three times.