Chapter 10 - Childhood Friend Seo Yerin, Masturbation Review
I sat in the lecture hall and scratched my ear. For some reason, I had the feeling someone was badmouthing me.
Well, if there was anyone these days who would badmouth me, it could only be one person.
"......"
It might have been since quite a while ago, not just these days, but anyway.
"~~~~~"
While I was listening to the lecture like that,
ttiring! ttiring!
Suddenly my phone rang. A familiar notification sound, that mysterious app.
I gave a slight nod to the professor who was glaring at me, then quickly slipped out of the lecture hall.
"What, now what?"
The contents being updated in the app left me dumbfounded.
[ Low-frequency breast stimulation patch / Nipple suction rotor review ]
[ Author: Seo Yerin ]
[ Number of uses: Total 14 / 2 times (Today up to the highest setting) ]
[ ...You're seriously like a crazy bitch. It's so embarrassing and disgusting. The fact that I went into that room alone without Han Junyoung and did this perverted shit is just insane. It's all that bastard's fault.]
My mouth was agape in disbelief, and I almost drooled.
"She did it alone...?"
The review content displayed by the app was clear.
That perverted bitch had snuck into my room and played with the toys all by herself.
I swallowed and scrolled down.
[ How was the fit? ]
Ever since I was showering, my pussy kept getting wet and I thought I was going crazy, but the moment the device just touched my chest, my nipples got hot and my waist wouldn't stop trembling.
[ How was the climax satisfaction? ]
It didn't feel good at all.
With my left hand, I crazily thrust inside my wet pussy and rubbed my clit, fucking myself as I pleased. I even said dirty words with my own mouth like 'I love shoving it in my pussy, I'm cummingg!' and squirted pussy juice like a fountain. I came so hard I soaked the sheets...
But I felt terrible...

My jaw nearly dropped.
"......I didn't even make her, and she even said stuff like that on her own?"
I kept reading.
[ How was the bondage? ]
Really not good. It's just uncomfortable.
I felt so ashamed and disgusted, like a perverted bitch doing a solo show. When that bastard forcibly grabs my hands and ties them up, and spreads my legs so I can't close them, then violating me...
No. Never.
[ Overall review ]
Han Junyoung, you're really the worst. You terrible bastard.
The fact that I tied myself up, pounded myself, and came makes me so upset and trashy.
I'm going to kill Han Junyoung. I really want to die.
"......"
It's infuriating, unfair, and resentful.
"...She did it all on her own, so why is she cursing me? Why does she want to kill me?"
It was equally arousing and spine-chilling. After she lined up all those knives on the floor yesterday, when I go in today, am I going to actually get stabbed?
"...So. What's your rating, Masturbation-nim?"
[ Rating ]
[ Fit: ★☆☆☆☆ ]
[ Stimulation satisfaction: ★☆☆☆☆ ]
[ Effectiveness in self-bondage: ☆☆☆☆☆ ]
[ Machine-only climax pleasure: ☆☆☆☆☆ ]
[ Total score: ★☆☆☆☆ ]
I looked up at the ceiling.
Seeing how the satisfaction rating is a total mess, I figure when I go home today, she's probably going to throw a tantrum as much as she can.
Right, all the content aside.
"......Should I boost her stamina?"
To fall apart like that yesterday and still do this again today. I'm not sure this perverted bitch's stamina will hold out.
I was about to put my phone away when another notification rang.
ttiring!
[ Earnings for this session ]
[ Accumulated points earned: 1960 (+80) ]
"...So this is that auto thing or whatever?"
Good job, Seo Yerin. You're earning points on your own.
But the problem was right after that.
ttiring!
[ Congratulations! ]
[ The subject's first voluntary review has been registered ]
[ Voluntary reviews earn an additional multiplier for review point settlement ]
"......"
So there was a quality assessment even for this review business.
No matter how wildly she climaxed and sprayed love juice during play, if she couldn't give proper feedback, the review score would be cut in half or even lower.
[ Review settlement multiplier determination ]
[ Simple: x0.5 ]
So initially, earning 10 points from play and 5 points from the review. Then, as Seo Yerin started speaking properly, she earned as many review points as she did from play.
But now a new category had appeared.
[ Review settlement multiplier determination ]
[ Voluntary: x2.0 ]
"...A voluntary review, huh."
A whopping 2x.
This meant that if Seo Yerin tormented herself on her own, playing to the same extent I tormented her yesterday, she'd earn 500 points from play and 1,000 points from the review.
Meaning I'd sit still and earn 1,500 points.
Consequently...
[ Accumulated points earned: 2160 (+240) ]
Seo Yerin earned 80 points from masturbating, and by writing a voluntary review, she gained an additional 160 points.
The point amount itself wasn't that high, but its implications were significant.
ttiring!
"There's more?"
[ Special reward for first voluntary review unlocked. ]
[ Skill: Pleasure ]
[ Brushed by the user's touch, one gains sexual pleasure. ]
"......"
It felt as if something was flowing into my brain. Like a sensation of being able to flip some sort of switch at will.
"......If you touch it, you just get pleasure?"
Actually, I had bought a skill at the very beginning.
[ Skill: Clean ]
[ Eliminates all fluids (semen, love juice, sweat, etc.) remaining on the subject's body and surroundings without a trace. ]
I bought it the first time I used a toy on Seo Yerin.
Because I wanted to try out the skill category rather than continuously buying toys.
But after that, the skill category remained locked, so I hadn't paid attention.
"But they're just giving this one away."
It seemed like skills weren't purchased continuously like toys, but unlocked and given automatically based on app usage.
The app kept making a fuss.
ttiring!
"!"
The app switched screens on its own again and shoved a screen at me.
[ ▼ Kinks ]
[ Forced speech — NEW ]
[ Dirty talk — NEW ]
Forced speech and dirty talk were added to the kinks.
Of course, since I kept demanding reviews and made her forcefully express her sensations, I can understand forced speech becoming a kink.
But dirty talk, lewd expressions, that is.
"No, I don't get it......"
I had never demanded Seo Yerin use expressions like being a bitch or a female slave.
"So that's why she's so good at spouting perverted stuff......"
She used terms like female slave without me ever making her, and there was a reason for it.
I thought she spouted vulgar expressions so shamelessly; so using those expressions was a kink.
But a bitch, really.
Where on earth did she learn such words?
"......This must mean she wants to be tormented more."
Apparently, she likes being called that kind of thing.
[ ▼ Satisfaction ]
[ Tap to check ]
There was a new category.
I kept scrolling down.
[ ▼ Satisfaction ]
[ Overall satisfaction: 10% ]
[ Sex satisfaction: 0% ]
[ Climax satisfaction: 70% ]
[ Kink satisfaction: 85% ]
"......You are full of dissatisfaction, aren't you."
Overall satisfaction being 10% means dissatisfaction is 90%.
Even climax satisfaction was only 70% after gushing like a fountain, and kink satisfaction is 85%.
"Just how much more do I have to torment her to satisfy her?"
Seo Yerin's perversion is truly beyond impressive, it's staggering.
"......"
I shook my head. I'll stop looking at the app here. I still had a lot to do today.
I went back to the lecture hall.
#
The cafe where I came for the group project last time.
Today, I was waiting for Lee Jieun alone.
The script was already prepared, and all that's left was to hand it over to Jieun and do a final presentation check.
"......"
But this queen bee still hadn't shown up even 20 minutes past the appointment. Is she planning to show up just before the 30-minute mark like last time?
uuung.
I was typing while looking at my laptop when suddenly my phone buzzed. It wasn't the app, but my messenger.
Who sent it? It's Lee Jieun.
I was seized by an ominous feeling.
I don't want to open it. But I have to.
"......Hoo."
I took a deep breath and opened the message.
[Junyoung-ssi ㅠㅠ I'm so, so sorry. My family just contacted me... My maternal grandfather is suddenly critically ill and I'm rushing down to a regional hospital right now...😭 I'm completely frazzled ㅠㅠ]
[I'm really sorryㅠㅠ But anyway, Junyoung-ssi, you organized the script so perfectly, and you're always way better at presenting than I am! Could you please just take over this presentation for me? 🥺]
[Seriously so, so sorry!! I'll treat you to something really delicious when I come back! Please, Junyoung-ssi]
"......No, does this bitch think I'm a pushover?"
If you're going to make an excuse, at least make it plausible—grandfather in the hospital? I wonder just how many times that grandfather has been critically ill. I've seen it at least twice, is this the third time?
"Eugh......"
Honestly, I half expected it to turn out like this. I'm not even angry anymore.
Anyway, the script is done, so I'll just go wave my hands a bit, read from it, and be done.
There was still plenty of time left.
"...That unbelievable bitch."
Impulsively, I opened the app.
[ New user registration ]
[ Lee Jieun (21) ◀Check detailed info ]
"Check detailed info?"
A menu I hadn't seen before. I tapped on Jieun.
[ Lee Jieun ]
[ ▼ Weak points ]
[ Cervix ★★★★☆ ]
[ G-spot ★★★☆☆ ]
[ Root of the tongue ★★★★☆ ]
[ Anal ★★★★★ ]
"......Remarkable."
Compared to Seo Yerin's typical weak points like clit or nipples, this woman... how should I put it?
"Every single one is hardcore."
Her cervix being a weak point—just how deep do you have to go to reach there?
How should I put it? Quite unique. No, is this even beyond unique?
And what's that?
"Anal?"


I'm not sure.
"Come to think of it, didn't she have a boyfriend?"
Does she do that kind of play with her boyfriend?
I scrolled further down.
[ ▼ Kinks ]
[ Exhibitionism ]
[ NTR ]
[ Bondage / Restraints ]
"......This woman is seriously not easy either."
I thought I'd never seen a pervert like Seo Yerin, but this woman is even more hardcore than her. Exhibitionism and NTR—her sex life seems pretty difficult.
I opened the last category.
[ ▼ Satisfaction ]
[ Overall satisfaction: 5% ]
[ Sex satisfaction: 0% ]
[ Climax satisfaction: 5% ]
[ Kink satisfaction: 0% ]
"......"
Climax satisfaction 5%, kink satisfaction 0%.
Staggering.
Shouldn't this be written as dissatisfaction instead of satisfaction?
"One hundred percent dissatisfaction? Not satisfied at all?"
Amazing. At this level...
"Why are they even dating?"
If it were me, it would be different. If it were me...
"!"
ttiring!
Suddenly, the app switched screens on its own.
ttiring!
[ Would you like to newly register Lee Jieun (21)? ]
The screen sparkled as if tempting me.
"......"
Before I knew it, I tapped the screen.
ttiring!
[ User Lee Jieun (21) has been newly registered! ]
ttiring!
[ Enter the new common sense to apply to Lee Jieun. ]
"......"
With trembling hands, I started typing the text.
...
And time passed. Around the time I finished all my presentations and was heading home.
uuuung.
My phone rang.
[ Junyoung-ssi ㅠㅠ... ]
A message from Lee Jieun.