Chapter 129
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Translator: MadScientist
Chapter: 129
Chapter Title: Observation Experiment Log (2)
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"With me observing, there won't be any research ethics issues!"
This woman was spouting the words of a total asshole adult.
What was I supposed to say here?
Nothing left but to play along moderately.
"Y-Yeah, you're right. You're an adult, after all, Elder Sister."
"Heh heh, that's right. Finally, you're starting to make sense, little brother."
She stood up from her seat, exuding an intimidating aura despite her small frame, and positioned herself right in front of me.
"Therefore, all the copulation acts you've done before are invalid from a research perspective!"
"I-Invalid?"
A shocking statement.
"Of course! What meaning does an experiment have without a control group, records, or expert observation? It's no different from stray dogs fucking in the street."
Her words sparked a bit of defiance in me.
From the way she talked, she seemed like someone with a domineering personality and status who probably had zero real experience.
"In that case, how about you demonstrate it yourself, Big Sis?"
"Hm?"
Just like I did with my other women, I flashed a subtle smile and looked at her.
It was a blatant invitation for her to strip and conduct the 'proper research' with me.
But she didn't catch the double meaning at all.
Masha Leosika stared at me with a grumpy expression, like I was an idiot.
"Little brother, what kind of stupid nonsense is that? I'm human, not one of your dolls. Our body structures are different from the start—how could I possibly demonstrate?"
"Uh... that's not what I..."
While I was flustered, she added,
"You're the one who needs to demonstrate. Right from the beginning, in front of me. I'll observe your experimental injection tool and analyze its pros and cons."
Strip.
The Elder's curt command made me instinctively step back.
People have this thing called presence, and the aura emanating from Masha Leosika was on another level compared to ordinary folk.
Was it because the word 'experiment' was involved?
It felt like her passion for research was manifesting as mana flow.
'She's insane...'
If I stayed in this atmosphere any longer, it felt like my mana core would get shredded.
"J-Just strip, right?"
I obediently tossed off my top.
Then I unbuckled my pants and pulled them all the way down.
My half-erect cock was fully exposed.
Any normal woman would scream, blush, or at least show some flustered reaction here.
But Masha Leosika wasn't fazed in the slightest.
Instead, she stepped even closer. Then she squatted right in front of my cock, staring at it intently like a coroner examining a body.
Her gaze held no sexual desire or embarrassment—just pure academic curiosity and intellectual interest.
"Hm..."
She stroked her chin, letting out a low hum.
"So this is your 'injection tool.' It produces seeds in the lower part, channels them through the shaft, and ejects via the mushroom-shaped tip... Simpler structure than I thought, yet quite efficient."
"Can't you just call it a cock?"
"What vulgarity! Anyone conducting an experiment must use professional terminology befitting it. From now on, yours will be called the 'male insertion reproductive organ' or 'injection tool.'"
I was starting to regret this a little.
Fuck, if I'd known it'd turn out like this, I should've just hit her with arousal hypnosis. That might've been better.
'Why didn't I do it from the start, you ask? Because just pounding away without resistance isn't my thing anymore!'
It was one of my bad habits that had developed lately.
More than women who liked me, I wanted to fuck those who hated me, to fill women who had no idea what was coming.
Masha stood up and pulled a pair of white gloves, a small magnifying glass, and a notepad from her desk drawer.
She justified the crude, lewd act under the guise of 'experiment,' proceeding without the slightest hesitation.
"Alright, let's begin with an external evaluation of the male insertion reproductive organ."
She squatted in front of me again, carefully lifting my cock with her gloved hand.
It was still only semi-erect, but it was a size that would overwhelm most women on sight.
Yet Masha showed no surprise.
The cold latex texture made my body twitch instead.
"Ngh...!"
"Hm... Skin elasticity is good. When erect, the sponge tissue expansion from blood flow seems to far exceed average. Length and girth also greatly surpass standard specs."
She pulled out the magnifying glass and peered closely at my cockhead tip.
Scribbling notes on her pad as she did.
"Now, let's measure 'rigidity.'"
With that, she gripped my cock firmly from base to tip with her gloved hand and shook it up and down a few times.
"Ho... Excellent resistance to external pressure. The erection mechanism is highly efficient."
Under her mechanical touch, my cock swelled harder against my will.
Seraphina had gripped it just like this in the Hallucination Room.
Conditioned reflex kicked in, and I went fully erect.
But right then, something unexpected happened.
Due to the Incubus skill trait, the organ morphs into the target's preferred form.
The skill activated on her too.
My massive cock writhed in her hand, shrinking in an instant to a cute, petite size.
"......"
"Hm... Interesting. It contracted."
Masha furrowed her brows, deep in thought.
"Size reduced dramatically. Measurements: length 10cm, girth... 9cm. No issue for seed injection, but physical pleasure to the test subject will likely be significantly diminished."
Fuck.
This is your custom cock, lady!
I wanted to tell her the truth, but I knew it'd just make things more awkward the more I explained.
'Got it. It's because the Elder Sister's body is so small.'
She—Masha Leosika—could adjust her body size, as I'd seen before.
Those two watermelon-sized tits from earlier... even by my standards, they were the most voluptuous breeding-optimized size I'd ever seen on a woman.
I cautiously broached the subject as she continued fondling my shrunken little guy with her gloved fingers.
"Um... Big Sis. Could you maybe make your body bigger, like last time? If you do, my injection tool... it'll probably grow back."
"Grow even more?"
"Yeah, heh heh. Bigger than the original size you saw."
At my words, Masha stared at me blankly for a moment.
Then she asked back with an incomprehensible expression.
"Grow... and then what?"
"Huh?"
"I told you, little brother. Even this cute size is fine for seed injection. Smaller is actually more convenient for my observations and analysis."
"......"
Damn, if it was because I wanted it that way, I wouldn't feel so wronged.
What guy wants his dick to shrink on purpose?
She shot down my suggestion instantly.
And moved on to the next experiment.
Now she was trying to swab the sticky precum leaking from my tip.
At this rate, she'd analyze and dissect every part of me.
I threw out my last gamble.
"B-Big Sis! Instead of this...!"
"Hm?"
"How about you analyze me doing it with a doll directly?!"
An offer to summon one of my dolls in the middle of her room and fuck it right there.
A truly insane proposal.
But with her... this mad research fanatic, it just might work.
And sure enough, Masha's movements paused for the first time at my words.
She set down the swab and looked up at me.
"You directly?"
She repeated it like she'd heard something unbelievable.
"You sure that's okay? It's an experiment, but... you don't need to go that far, little brother. You might hurt yourself."
"I'm fine, Big Sis! Practice is more important than theory, right? You need to witness with your own eyes how my injection tool works, how it affects the test subject—the entire process!"
"Well, that would be ideal, but..."
I didn't let the opening slip and pushed harder.
"Perfect timing—I prepared a very special test subject just for today, Big Sis."
Without hesitation, I sent mana threads backward and activated the skill on Aira Petrovna's doll, left slumped in the corner of the room.
A figure slowly materialized from behind.
It was Aira Petrovna, lately serving as my precious secretary.
'To Masha, though, she's her most cherished former disciple—and the traitor who ruined the project and ran away.'
Was that why I'd dispelled Aira's summon the moment I saw Masha?
This was a gamble and a half.
"Master, you called?"
Aira bowed toward me.
That was the moment.
Sure enough, Masha froze solid.
Her notepad and pen clattered to the floor.
Her eyes widened in disbelief.
"A... Aira...?"
"Calm down, Big Sis."
I lightly patted Masha's shoulder and stepped between her and Aira.
"It's just a doll. Modeled after Aira Petrovna. See? Identical, right?"
"......"
"Looks real, but it's not. Just an empty shell I made with my skill. A puppet that moves on my command."
Aira was shocked too.
Her pupils shook as she realized what I'd done.
Before Masha could react, I forced Aira to her knees in front of me and shoved my still-small, cute cock into her mouth without hesitation.
"Guhk, glurk...!?"
"See? Just a doll."
I grabbed the back of Aira's head and started thrusting my hips.
My cock slid slickly in and out of her small mouth.
And the change began again.
The moment her tongue touched it, her hot oral mucosa enveloped me. Tailored for Aira, my cock began swelling grotesquely once more.
Her jaw gaped as if dislocating, cheeks bulging like they might burst. My cockhead forced its way deep into her throat.
"Glurk, glurk, mmph...!"
Aira gagged, unable to even scream, tears welling in her eyes.
But soon, pleasure essence seeped in, flushing her face red.
Squelch. Squelch.
She gradually hollowed her cheeks, smiling blissfully.
I gripped her hair and pistoned mercilessly, mashing and prodding the soft flesh inside her mouth with my cock.
"Hoo, hoo...!"
Squelching sounds filled the room. Her saliva dripped down my shaft, splattering the floor.
I turned to the petrified Masha with a satisfied smile.
This is sex—no, research.
I pulled out my glistening, saliva-slick cock amid the wet sounds. Then I shoved Aira face-down onto the floor. Her soaked pussy gaped invitingly toward me.
She wiggled her ass, pushing it toward me further. In a voice steeped in pleasure essence, she begged.
Her former master seemed invisible to her.
"Master... hurry... fill me up... with your seeds... deep inside."
At that sight, I couldn't hold back anymore.
I pressed my grotesque, Aira-customized monster cock against her entrance.
Right then.
"Stop!"
A trembling voice came from behind.
It was Masha.
"Stop it, little brother... that's enough."
Huh.
Didn't expect such a weak reaction.
I'd thought she'd grab her notepad to record coupling angles or piston speed or whatever. But that horrified look? Even better.
I deliberately ignored her.
Instead of plunging into Aira's pussy, I wedged my cock between her massive ass cheeks and started grinding.
"What's wrong, Big Sis?"
Squelch, squelch.
My cock slid between Aira's soft flesh, making lewd noises. I turned to Masha with an innocent expression.
"This is all important research too, right? Gotta observe the reaction at the moment of male insertion reproductive organ coupling with the female one."
"It's an... experiment, yes, but... this is..."
Deep down, she still saw Aira as her disciple and was bothered by it.