I Went About My Life Normally Without Noticing It Was a World With Few Men, and Things Went Terribly Wrong - 7

Chapter 7: The Evolution of Men and Women

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“I’m sorry…”

After thoroughly sucking out every last drop of semen, Yuka-san, having recovered from her rampage, slumped her shoulders dejectedly. It was just past 11:00 AM and the count started over from zero once again.

In any case, my stamina was bizarre. Looking back to count, there was the first round when she attacked me last night. The second was when the over-eager Yuka-san milked me right after we woke up, followed immediately by the third round to commemorate our reconciliation. And then there was this current fourth one. It was possible I had let some out while I was asleep, too. Regardless, I had maintained an erection for over nine hours.

Since I was certain I wasn’t like this until yesterday, I had no choice but to assume I had changed when the world shifted. It was like some kind of “unlimited stamina” cheat had been bestowed to me. Though, if I was called a monster of stamina, Yuka-san was even more of one. Her sex drive was stronger than mine, and she wanted to go again and again. I wasn’t sure if every woman in heat became like this, or if she was just exceptionally lewd…

“Do you despise me now…?” 

“No, it’s okay. I don’t dislike lewd women.”

When I answered, her expression shifted with impressive dexterity from one of utter shock to a face beaming with joy. Truthfully, I should have scolded her for her clumsy sex just now. She had shown me the kind of hip-grinding a misguided man—the type who based his moves on adult videos in the old world—might pull. 

I wanted her to learn how to have proper sex… Though I wasn’t enough of an expert myself to say that with a smug face. Besides, considering I had been finished off so easily by those very moves, I didn’t have the gall to criticize her. So, I decided to save that for another time.

“And well, it wasn’t all bad.”

The reason I said that was because, thanks to that intense piston-motion, a generous amount of warm water had entered her—clean water, since I had left the shower running—and it had acted like a water-wash with my penis serving as the brush. The grime inside her vagina had been scraped out by my glans. Well, I had just performed an internal ejaculation, so it was dirty again, but it was much better than before now that the remnants of last night and this morning had been cleared out.

For now, our soak in the tub was over. I figured we should wash our hair one more time and get out. I lifted Yuka-san by her buttocks, stood up, and carefully stepped out of the tub to sit back down. That was when a problem arose. It seemed Yuka-san’s hands were still gripping my waist and she couldn’t move them.

The way she gripped me when she started her rampage was likely different from the “reflex.” Just like a man in the old world might do when grinding against a woman, she did it simply because it was easier to move or perhaps out of a desire for dominance? And because she received an ejaculation in that state, things had ended up like this.

“I’m sorry, I’m so sorry!” 

“It’s okay, it’s okay. Just stay like that.”

She seemed to be trying desperately to peel her hands away, but they wouldn’t budge. I wondered what it felt like to be unable to resist something even when your conscious mind willed it. The women of this world sure have it rough.

Then again, since finding a man to have sex with was an ordeal in itself in this world, this probably almost never caused trouble in daily life. It was a problem limited to the “blessed” women who actually had a man, and it just meant they should refrain from having sex when they were short on time. Which meant people probably never even considered having a “quickie” in the office during a lunch break. In that sense, this might be a society with high moral standards.

I figured I had no choice but to do the washing myself, but then I noticed another anomaly. Yuka-san had been fidgeting for a little while.

“Um… Yuka-san?” 

“I-It’s nothing. I’m fine.”

Suspecting what was happening, I touched her lower abdomen and gave it a light press.

“N-No! Don’t press there!” 

“…Are you about to leak?” 

“Uuuuuh…”

She turned beet-red and shook her head in denial, but she couldn’t stop the fidgeting movements of someone holding something back. From the neck down, her entire body was clearly confirming my question. At this point, it was probably better to just let her get it over with.

Now, don’t misunderstand me. I don’t have that kind of fetish. 

But the rigidity in her limbs wouldn’t fade for another two hours. It was easy to see that her patience wouldn’t last two minutes, let alone two hours.

“You can let it out.” 

“Eh!? …A-ah, ah, aaaaaah!?”

My permission must have been entirely unexpected. Startled, a spurt of lukewarm liquid shot out, raining down on my crotch. And once it started, the momentum couldn’t be stopped. She seemed to want to at least hide her face, which was red enough to boil, but even in this situation, she couldn’t move her hands. She remained staring into my eyes with a look of despair as she continued to urinate for a long, long time.

I’ll refrain from describing the smell of that concentrated, “first thing in the morning” liquid, thank you very much.

After watching her finally finish after several dozen seconds, I silently turned on the shower and washed it all away. I swear I didn’t have that kind of fetish, but I wanted to say that her face full of shame and despair was quite cute.

“I want to die… Just kill me…”

For a good thirty minutes, Yuka-san had been an emotional wreck, wailing, screaming “please forget this,” and clinging to me while begging “don’t abandon me,” but she finally seemed to have calmed down. Though the fact that she had become so calm she was now gloomy was probably just my imagination. She was now able to successfully cover her face with her hands. It was now clear that the rigidity in the hands faded more easily than in the legs.

But this was troublesome. Call it “sympathetic urination” or whatever, but the truth was, I was starting to feel the urge too. While I was debating whether to confess this, Yuka-san gave a little twitch. She had sensed something.

“Please let it out.” 

“Eh… Are you sure?” 

“Yes! I welcome anything if it’s yours, Hikari-san!”

I recalled hearing somewhere that because the distance from the bladder to the urethra was shorter, it was harder for women to hold it in. I felt like I could hold it for a while longer.

That said, it was doubtful I could last another hour and a half. Or rather, I now suspected it was more likely it wouldn’t be over in just an hour and a half. And I knew that if I was going to let it out, now—while we were in the bathroom—was the best time. If I tried in the toilet, there was a risk of spilling, and considering I’d have to wash afterward anyway, we’d just end up back in the bath.

“But, you know… For a man, it’s hard to go when you’re erect.” 

“Is that so!? I wonder why?” 

“Well, it comes out of the same place as semen. It’s like switching between ‘ejaculation mode’ and ‘urination mode,’ right?” 

“Ooooh!”

I didn’t actually know for sure. It was just how it felt to me. 

If you want the facts, go ask a urologist. 

Yuka-san was incredibly intrigued. She probably found it exciting to hear this kind of “crude” talk from a man’s mouth. She was just like the men in the old world who wanted to make women say lewd things.

“Wait, so you can’t go as long as you’re like this?” 

“It’s not impossible, but it’ll take time.” 

“I’ll wait as long as it takes!”

She was really pushing the issue. I wondered what her motive was. Did she want to get back at me by making me undergo the same humiliation as her, or did she genuinely have a fetish for this?

“Nnh…! W-Why are you moving?” 

“Wait, if I stay in this position, I’d hate for it to go into your uterus, Yuka-san.”

I tried to shift the tip of my penis. The whole time, her cervix had been “locked on,” as if determined not to let even a tiny stray leak of semen escape. It would be too filthy for urine to get in there. We supposedly have a fertilized egg that would become our child, right? I still hadn’t fully wrapped my head around that, though.

“T-That’s right. Because yours is so long, Hikari-san, it reaches places it’s not supposed to reach…”

By the standards of my old world, I believed I was about average, but here, I seemed to be a monster-class “huge” specimen. Apparently, reaching the cervix was supposed to be impossible.

I wondered why there was such a mismatch between the depth of a woman’s vagina and the length of a man’s. While I waited for the urine to come, Yuka-san and I chatted excitedly about that topic for a bit. She wasn’t in biology, but as a student in the Faculty of Science, she was deeply interested and told me all sorts of things about the human bodies of this world.

To begin with, in the history of this world, the gender imbalance was said to have remained unchanged since ancient times. It wasn’t a case where men suddenly decreased in modern times due to some mysterious disease or cosmic rays.

I managed to keep my expression neutral so she wouldn’t suspect why a university student like me didn’t know this, but almost everyone who left a name in history was a woman. The Pharaohs of ancient Egypt, the Greek philosophers, the Chinese generals—all were apparently women. It seemed women had been more numerous and powerful since way back then, while men were weak, precious, and kept protected. Some wars were even fought over the ownership of men.

Since before recorded history…. That meant it was on a time scale where biological evolution was a factor. That was why they had undergone such strange evolutions like the Semen Sensing Reflex, which the women of my world didn’t have. This wasn’t a change that happened overnight. At least, that was how it was according to the records and the general knowledge of the people in this world.

“Therefore, since the vagina is deep, men’s erections must have been this large in ancient times.”

Based on the premise she’d just explained, Yuka-san pointed this out. I thought that was a logical conclusion. If men’s members were short to begin with, making the vagina deep would only make pregnancy more difficult, which wouldn’t be an advantage. Sure, there might have been a certain number of women who didn’t want to get pregnant, but as an evolutionary strategy for a species, it felt off.

So, in the distant past, men’s penises must have been large, and they must have degenerated later for some reason. One possibility was that the speed of that degeneration—though in biological terms, that was also evolution—was too fast, and the women’s side hadn’t quite caught up yet.

Another possibility was that women had already adapted to that change in a different way. The Semen Sensing Reflex was exactly that. By latching onto the penis as deeply and for as long as possible around the time of ejaculation, they could increase the chance of pregnancy. The ease of pregnancy during heat (ovulation) and the effective movements where the vagina tightened to wring out semen were likely the results of trying to deal with the thinness and shortness of penises. It was a sufficiently persuasive explanation. Finally, Yuka-san concluded by saying.

“Your penis, Hikari-san, might be the original form of ancient men.”

Thanks to being engrossed in our serious discussion, my erection weakened slightly, and I was able to successfully urinate. No one benefits from a detailed description of a man doing that, so I’ll skip it. I’ll only report that for some reason, Yuka-san had a look of ecstasy on her face while it was happening inside her.

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An hour later, we finally finished meticulously washing our bodies and hair—specifically, we poured plenty of warm water into her vagina, let it drain, and washed it—and stepped out of the bath. We brushed our teeth, and I shaved as well. It goes without saying that Yuka-san watched the shaving process with deep interest.

Drying our bodies and hair while stuck together was another ordeal. As was changing the bedsheets. I chose to ignore the stains that had soaked into the mattress underneath. I tossed the bedding into the washing machine and started the wash. Since it was summer, we’d be fine without blankets. I lay down on the bed that was now clean, or so I told myself.

It was already past 2:00 PM. It had been about three hours since Yuka-san had rampaged and milked me in the bath. I was starting to feel hungry and was thinking about eating my lunch box.

“Ah… I might be able to move.” 

“Really?”

Yuka-san, who had been slumped over me with her breasts pressed against me, suddenly looked up. More than twelve hours had already passed since the initial insertion, but the end finally seemed to be in sight. It had been a long road.

That said, this was a human body. It didn’t just “snap” back to a normal state as if a “status ailment” had been cured. Sitting up, Yuka-san began trying to spread her legs bit by bit, her limbs trembling. She slowly raised her hips, millimeter by millimeter, and very gradually but surely, the visible portion of my penis emerging from her vagina grew.

“Fuu… huff, hu-haaa…”

Exhaling hot breaths, she focused with a face as desperate as if she were giving birth as she squeezed the shaft out of her vagina. The tightening felt good. But since I knew it was better for it to be as small as possible, I tried to divert my consciousness by thinking of other things.

“Just how big is it…?” 

“Keep going. It’s almost halfway out.” 

“Only halfway!?”

The length of the shaft that had escaped increased steadily—four centimeters, five centimeters. I couldn’t rush. The progress was definitely there.

“No, it feels good… I’m sorry…” 

“Wait, don’t give up!” 

“Haa, haa, haa…”

I did my best to encourage the flagging Yuka-san. But the flames of lust were clearly beginning to light up in her eyes. Her hips began to move up and down in small jerks.

“Just a little more! It’s almost there!”

Even if it wasn’t all the way out, once a little more was gone, the momentum of her own piston-motion would probably be enough to make the penis pop out. I tried to help, attempting to push her hips up. I pulled my own waist back, trying to distance myself as much as possible.

But in the next instant, something went wrong.

“Auu!?”

Just when it was only a few centimeters from being out. The glans of my penis scraped harshly against her G-spot in the shallow part of her vagina. Yuka-san’s body gave a jolt, and in the moment she lost her strength, her hips collapsed, and with a “do-chun,” my penis was thrust all the way back to the deepest part.

“Ngaaah!! No, no…”

And once again, her legs tightened with painful force, holding my waist like a predator. It was the Semen Sensing Reflex. Seeing Yuka-san’s behavior, I realized for the first time that I was about to ejaculate.

“Ah, crap, if I move it’ll come!”

I panicked. While I was on the verge of tears seeing my endurance go up in smoke, Yuka-san’s face, distorted with pleasure, drew closer. I was pulled into a tight embrace as her arms slowly wrapped around my back.

“Let out your ejaculation…”

She whispered into my ear and gave it a playful nip. Yuka-san’s hips rose and slammed down just once with a “pan.” Into her clinging cervix, I poured out the proof of my defeat.

As I poured out the liquid that seemed to overflow endlessly, I stared at the ceiling, filled with a sense of patheticness. I held her body—which was trembling as she felt the hot semen sloshing in her—just as tightly as she held me, determined to at least not let her go.

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