The Super Genius Doesn't Lose to Common Sense Alteration (3)
"S-sex?"
Her eyes trembled faintly as she echoed the word back at me.
"Where? Right here?! I have a boyfriend, you know!"
"Yeah… and conveniently, no CCTV either."
Propositioning a woman I'd only just met today to fuck her right then and there made my face burn. Maybe I still had some pure-hearted streak left in me after all. She was more than good enough for a first time, sure—but I'd always figured that sort of thing would happen with a girl I actually liked first.
"Why the hell should I do that?!"
Her tone was sharper than when she'd talked about quitting earlier. The more absurd the demand, the stronger the rejection, I guessed. I checked that the saliva still glistened on her neck and pressed on.
"Because it feels good. Don't you ever want to sneak off and slack during work hours?"
"S-slack off?"
"Yeah. We'll just say you were taking time to explain the sponsorship stuff to me. And you never actually said no."
"That's…"
Han Jisu's mouth opened and closed like she was trying to form words, then shut tight. Her tightly clenched fists trembled.
"But… I've never… I don't…"
"What was that?"
"But I've never done it before so I don't even know if it feels good!! I've only ever heard about it!"
Ah, so that was it.
"It'll definitely feel good. I guarantee it."
"…Haa. If anyone else said that I'd have slapped them already. Why don't I feel like doing that to you, Park Yushin? It's like I'm under some kind of spell."
"Maybe you're just attracted to me?"
"You've got some nerve saying that to a girl with a boyfriend."
Even as she spoke she slipped off her heels and slowly peeled down her pantyhose. Her body was rigid, stiff with the dual tension of first-time fear and the knowledge she was crossing a line at work.
Since it's her first time, I want to make it feel good for her.
Me, Park Yushin. Sure, my own pleasure mattered, but I was the kind of careful guy who paid attention to whether my partner was enjoying herself too.
If I'm going to keep making full use of this ability… sex is something I'll have to get good at anyway.
Han Jisu was just an extra. Once I moved up to supporting or main-character types, their settings wouldn't end after a couple of lines. There was no guarantee my infection ability would work completely on people like that. The effect would probably be weaker or not last as long. So if I wanted more than a one-time thing, she needed to walk away with a positive view of sex with me.
System, you got any sex-assist functions or something?
…This program is not intended for that purpose.
Of course it wouldn't help with that. Tch.
However, I can still offer assistance.
What? You should've led with that.
……
Your partner is currently tense. Begin with light skinship to acclimate her to physical contact.
You must not let on that this is also your first time.
Don't make it awkward, huh? Fine.
"Han Jisu."
I called her name and stepped behind her, then began slowly kneading her shoulders.
"Hup! What are you—"
"You look really tense. Your shoulders are rock-hard. Why are they like stone?"
"Mmm… well, I sit at the front desk all day. Staring at a screen makes my neck stiff—ah, right there feels good… hick?! If you press that hard…"
As we traded light conversation and I worked her shoulders, the tension visibly melted from her body.
Continue skinship across her body, ease her into a comfortable position, and naturally eliminate any elements that might cause discomfort during intercourse.
My hands moved from her shoulders down her arms. I shoved the obstructive chair aside and sat her on the table. While massaging her arms I peeled off her outer layer and undid her blouse buttons one by one from the top. Each button that opened released a faint, fresh body-wash scent mixed with the soft smell of a woman's skin.
Her chest is… B? No, probably C.
My hands stayed gentle and slow through the foreplay, but my eyes and thoughts raced. The lower half of me swelled until it felt ready to burst.
Stimulate erogenous zones. Nipples and clitoris are recommended. Gauge her reactions and increase speed accordingly.
The bra cups slipped quietly down from the upper curve of her breasts. Pale cream fabric fluttered carefully onto the table beside us. Under the office lights, two ripe apples came into view. I rolled the tips between thumb and forefinger.
"Hnn…!"
A short moan, her lips trembling faintly. Watching her reaction, I slid a hand under her skirt. The moment my fingers touched her panties they were already soaked. I pushed the thin scrap of fabric aside and a wave of humid heat rushed against my fingertips.
"Hieek?!"
Slick, warm texture. Among it I found the little protruding bud and rubbed.
"Haa, nngh…"
Then Han Jisu grabbed my shoulder. I paused, thinking she wanted me to stop—only for her to wordlessly spread her legs wider.
This should be enough, right?
I tested by sliding one finger inside.
"Hyaak? It's going in…! This feels weird!"
My finger was sucked in with a soft wet sound. Two would probably fit without much trouble.
Ah, fuck, I can't wait anymore.
I shoved my pants down and freed my cock.
"I-it's big… Will that even fit…?"
I was pretty confident in my size. I'd just never had a chance to swing it around until now.
"I'm putting it in."
"……Okay."
The head pressed against her entrance.
"……!"
The moment it touched I understood. Warmth and texture no onahole could ever match.
Continue insertion while monitoring her reactions. Forcing it in all at once will cause significant pain.
I slowly pushed myself into her.
Something catching, then giving way…
The thought barely formed before—
"Hyat?! Ahh, a-ah, it hurts…!"
Han Jisu cried out in pain, so I stopped immediately and held still in that position.
"Haa… haa… I-it's okay now."
I resumed, pushing a little further then stopping, over and over, until—
Thud.
"Ah…"
I bottomed out. I gave her a moment to adjust. Then I couldn't hold back any longer and began moving my hips.
Schlick, schlick.
"Hup, hnn, haa… nngh… aahng…"

With every thrust, cloudy red fluid leaked from where we were joined. Virgin blood, I supposed.
"Does it hurt?"
"A-a little? I think it's because you're so big… There's this shivery feeling now, but it feels good…"
Hearing that it felt good did something to me. I gradually picked up the pace, rolling my hips.
The G-spot is located on the front wall of the vagina. Scraping it with the glans multiplies the pleasure.
Additionally, firm pressure against the cervix can induce a portio orgasm.
The moment I adjusted my angle per the system's advice, her reaction was immediate.
"Hgiek!? Ang, aahng! Wait! The stimulation is way, way stronger than before! Haugh, ahit!"
Schlick-schlick!
"Haik! Something—something's coming! W-wait…!"
Han Jisu's face was flushed, her breathing ragged. Inside her had been growing hotter by the second as well. We were both racing toward the finish when—
Knock-knock.
Without a word we both froze mid-thrust.
"Is anyone in there?"
Someone was knocking. The door was locked so they couldn't come in, but they might have heard us.
"…What do we do?!"
She whispered urgently against my ear.
"…If we stay quiet they'll think they imagined it."
Just as I said, the person outside seemed to decide they'd misheard; their footsteps faded away.
"…Can you keep the moaning down a little?"
"You're the one who made me feel this good and now you're saying that?! Haa… Sit on the chair. I'll move."
Fine by me. My physical rank had dropped, so even that little bit of thrusting had already left me on the verge of collapsing.
Schluuurp.
My cock, soaked in her juices, slid free and gleamed under the lights. I sat in the chair; she climbed on top of me, gripped my shaft, and slowly lowered her hips.
"Hnn… Why does it feel even bigger than before…. Ugh!"
When the head pressed against her cervix again her eyes went wide, but she managed not to cry out loudly.
Slap-slap-slap.
The wet sound of her ass and thighs meeting mine filled the empty room in irregular bursts.
"Haa, haa, haa. I think something's coming again."
Her pace quickened until she was whispering against my ear. I was nearing my limit too.
"I'm cumming inside."
"W-what? Hnn, inside? What if I get pregnant…!"
"I'm azoospermic, so it's fine."
"Ah…"
At the word azoospermia Han Jisu nodded and clamped her thighs around my waist.
"Then… cum inside me."
Suddenly she crashed her lips against mine in a kiss.

"Chuuup, chup, ssuck. Hup!"
The moment her tongue stopped swirling inside my mouth I poured my semen into her.
"Hnnnnnn—!"
With her mouth sealed against mine, none of her moans escaped. Every thick pulse I pumped deep made her waist shudder.
"Haa… haa…"
She stared blankly at me, then dragged her tongue across her lips.
"If you ever want to do it again… just say the word anytime."
We'd somehow managed it, but had it gone well? I decided to test her.
"Then from now on, always keep my semen filling your womb. Come every eight hours."
The Han Jisu from earlier would have flushed and demanded to know why she should. Instead—
"Every eight hours? Understood. As long as you guarantee me sleep time…. Here's my number."
She accepted my order with complete obedience.
"Then I'll need to wear a pad or something. It'll feel… sticky, but."
"Good. And there's a Casey on the special sponsors list. Keep an eye on him. That guy has the Common Sense Alteration ability. He probably already used something on you… Just pretend it worked and feed me every scrap of information."
"Common Sense Alteration? Something like that exists? Well, if you say so, Park Yushin, it must be true. Understood."
Perfect. Still, something felt incomplete. Doing this one person at a time would take forever.
"…Oh, right. If I give you my semen later, could you smear it on other female employees and then insert it into their vaginas and seal it?"
I was planning to outsource the auto-hunting to her. Partly so I wouldn't have to personally fuck every female employee I didn't want to.
All I'd have to do was periodically resupply semen to the ones she caught.
"Huh? I can try, but… would that even work?"
"It will."
"Well… if you say so, Park Yushin. Okay."
She agreed and began gathering her clothes. Even while dressing she kept her thighs pressed tightly together so none of the semen would leak out. It was lewd as hell.
"…What are you staring at?"
"It's kind of hot."
"At least you're self-aware."
"It was my first time too."
"…What? And you were that good?"
"Maybe you're just sensitive?"
"…Let's stop talking. Are you going to meet the director today?"
"Of course."
That was why I'd come here in the first place.