The day after that.

Today was the long-awaited health and physical education class.

However, just before the lesson began, I was called over by the teacher.

It was my first time inside the staff room, and being surrounded by nothing but female teachers was overwhelming, but Sakura Shio-sensei spoke to me quite normally.

“I just want to confirm one thing, Fukase-kun. You marked that you need an uribou-chan, correct?”

“Um… yes.”

“…………Understood. Then I’ll hand them out during today’s health and physical education class.”

“Yes…” 

That was the entirety of our exchange, but I could understand why Sakura-sensei had her doubts.

After all, I wasn’t a woman, nor did I even have a hymen.

The real reason I wanted one was simply because I wanted to actually hold an uribou in my hand.

◇◇◇ 

“—All right, class, let’s begin!”

Sakura-sensei entered the classroom with a bright voice.

“Today, we’ll be studying sexual activity. There’s nothing to be embarrassed about, okay? Please take a look at the handouts in front of you.”

Even though our high school life had only just begun, it seemed the very first health and physical education class would immediately dive straight into that topic.

Without the slightest hint of embarrassment, Sakura-sensei cheerfully made that announcement and began handing out the printed materials she was holding.

The moment I took the sheet passed back from Asuka, who was sitting in front of me, my eyes widened before I could stop myself.

—No, I’d had a vague sense this was how things might go.

But seeing it actually placed right in front of me, I couldn’t help but feel flustered by its contents.

“This is the structure of the female reproductive organs.”

The handout showed a diagram of the female reproductive organs, laid out so that their internal structure was easy to understand.

And no matter how closely I looked or even when I flipped the page, there wasn’t a single illustration of male genitalia anywhere.

In other words, in this yuri-centered society, male genitalia simply weren’t considered worth studying.

“Several hundred years ago, advances in science brought changes to our bodies, making sexual activity between women possible, and eventually, normal. To explain it in more detail, gamete fusion through mucosal contact—in other words, the binding of genetic material—made it possible to conceive children.”

Whoa, seriously…?

I knew this was the case, but hearing it explained like that made it hard to believe.

Normally, fertilization occurs when a sperm enters an egg, resulting in the formation of a child.

And out of hundreds of millions of sperm, only a tiny handful ever manage to reach it.

Yet according to this explanation, genetic information is transmitted through the egg alone, resulting in conception.

And mucosal contact—that is, rubbing sexual organs together—apparently constitutes sexual activity between women… which, when I imagine it, is incredibly erotic.

“But that raises an obvious question, doesn’t it? Which one gives birth to the child?”

Right. This was one of the questions I’d wanted answered.

Apparently, I have two mothers. One of them disappeared after learning that the child would be a boy. The one who endured the pain of childbirth and raised me is the same mother I had in my original world.

“Some of you may already know this, but there are two methods. One is to take a contraceptive, which ensures that only one partner becomes pregnant. The other is to take a pregnancy-induction drug, which prevents your own genetic material from being passed on and instead causes the other person’s egg to fuse with your own, inducing pregnancy.”

So contraceptives do exist in this world as well.

But a pregnancy-induction drug…? That was something completely outside my knowledge.

Both methods rely on medication, but I suppose this, too, is one of the results of scientific advancement in this world.

“From what I’ve explained so far, you should understand that during sexual activity, either partner can become pregnant. So unless one side chooses to refuse pregnancy, you’ll just keep having children at an ever-increasing rate.”

You’ve got to be kidding me… If both sides can get pregnant, that’s basically mass baby production.

Compared to a world with men, wouldn’t both the pregnancy rate and the number of births be more than double? Just what kind of population numbers does this world even have now…?

“And there’s one more important thing. This next item will be distributed to everyone, regardless of what you put on the questionnaire, so I’ll hand it out now.”

Sakura-sensei then took something out of the bag she was holding and began handing it out.

The moment it was placed in my hands, I widened my eyes at the familiar-looking design.

—A condom.

“This is a condom. It’s inserted into the vagina and used to block it off. By wearing a condom, the uterus is protected, and contraception can be achieved with a high degree of reliability.”

As she spoke, Sakura-sensei tore open the condom package and took it out.

However, the condom was different from what I’d imagined.

“So this is what a female condom is like…”

I muttered softly, impressed by the shape of the condom I was seeing for the first time.

I’d heard that they existed in my original world as well, but this one seemed a little different.

At a glance, the female condom that had been handed out looked similar in shape to a male condom, but the base was much wider. It was designed to cover the entire vaginal opening, apparently preventing direct contact.

“I can’t exactly show you how to put it on, but I’ll demonstrate as much as I can.”

Just as Sakura-sensei spread the condom open in her palm, she blew air into it, causing the condom to swell up and take on the unmistakable shape of a chinchin.

The girls in the class watched with a hint of embarrassment, but not one of them seemed to think it looked like a chinchin at all.

“After inflating it with air like this, you insert it into the vagina while guiding it with your fingers. See? It’s simple. Contraceptive pills are fine too, but to prevent unwanted pregnancy, let’s also make use of these, which are easy to obtain.”

As she spoke, Sakura-sensei formed a ring with her other hand to represent a vagina and inserted the condom into it.

…Unwanted pregnancy.

Does that kind of thing happen even between women?

It felt like a phrase that gave me a brief glimpse into the darker side of this yuri-centered society.

“—All right, moving on. Next up is the long-awaited uribou-chan. I’ll be handing these out to those who circled that they needed it on the survey.”

Then the next thing Sakura-sensei took out of the bag was the uribou—the very item I’d been curious about.

Something used to break the hymen.

This time, since not everyone had selected that they needed one, Sakura-sensei personally went around placing them on the students’ desks.

And when I noticed the students who didn’t have one placed on their desks, I realized something.

—They’ve already lost their virginity!? 

Uribou + unnecessary = already owns one → no longer a virgin.

I started to think that this equation might actually hold true.

“You’re not a virgin!?”

“Y-You idiot! I’m a virgin! My big sister gave me a bunch of her hand-me-downs… but I’ve never actually used any of them!”

Hand-me-downs…? Is it really okay to use hand-me-downs for such an important ritual—one meant to break the hymen?

Doesn’t that make it feel like some kind of quick-and-easy item, like those piercers you use to punch holes in your ears?

And after hearing that exchange just now, the formula I’d come up with earlier no longer held true.

Even someone who chose “unnecessary” this time could still be a virgin.

That said, it didn’t completely rule out the possibility that they weren’t.

“Everyone, whether you marked ‘necessary’ or ‘unnecessary,’ whether you’re a virgin or not is a private matter, so please don’t pry too much. Some people who need one might simply want to keep a spare, after all.”

Ah, right. Sakura-sensei’s right about that.

In that case, everyone could potentially be either a virgin or not… 

…That’s deep.

“All right, you’re the last one.”

“Thank you…”

Sitting at the back by the window, I was the last to be handed an uribou.

“Huh? A boy…?”

In an instant, all the girls’ gazes focused on me. I’d experienced it a few times before, but this time, it was honestly unavoidable.

“Kazuto-kun! Don’t tell me—you’re going to use it on your butt…!?”

“You stupid! Of course I wouldn’t use it… I was simply curious about what it looked like…”

Aoi was taken aback that I’d been given an uribou.

If anything, I think it suits him more.

After that exchange, I picked up the uribou I’d been given.

Its shape wasn’t exactly like a chinchin.

It was more like a rod—a thick, pink rod. And at the tip was a design that looked like an animal’s face. Don’t tell me they named it uribou after a baby wild boar!?

It was certainly cute, but did it really need a face? I honestly don’t understand women’s sense of design…

When I touched it, the soft texture felt like silicone. 

It was probably made of a material that was gentle on the skin and wouldn’t hurt.

Looking closer, there was also a sponge-like mesh pattern. Maybe it was designed so that any blood would be absorbed directly into the uribou itself.

Its thickness was about the same as that of an average man’s chinchin.

Its length was also appropriate, suitable for breaking the hymen.

“—!?”

I suddenly raised my head. 

Then I noticed—the girls who’d received an uribou were all looking with curious interest.

And then, some began wrapping their hands around the rods and rubbing them up and down. 

Though I understood they were checking the texture, this scene clearly resembled someone stroking a chinchin. 

That is way too erotic…

“All right, I’ve handed them out, so please face forward.”

Sakura-sensei was holding an uribou as well, and it looked like the explanation was about to begin.

“I assume you all know its purpose by nowbut this uribou has become quite common these days. It’s designed for smoothly breaking hymens and works well for many people. Of course, you can also buy them online, but the ones handed out at school are the standard type. There are many other variations available as well.”

…Of course there would be. 

Its use isn’t limited to just breaking hymens either. 

“Self-stimulation is something everyone goes through during puberty.” 

Right! That’s it! 

It can also be used for masturbation! 

This sex ed is way ahead of its time…!

“So, let’s practice carefully breaking hymens using the uribou as our final activity today.” 

S-Seriously…? 

This health class is absolutely insane.

“Please pair up with someone nearby. Use the condoms you received earlier and put them on your palms. The other person will hold an uribou and insert it into the condom. Those who marked ‘unnecessary’ can use their own uribou.” 

I gulped audibly before facing Aoi. 

“U-Um, I’ll put on the condom.” 

That phrasing might cause misunderstandings. 

Aoi made a ring with his hand and slipped the condom over it.

“All right, it looks like you’re ready. Insert the uribou and slowly push it in as far as possible.” 

Following Sakura-sensei’s instructions, I inserted my uribou into Aoi’s condom. 

“Aoi, I’m going to go slow, okay?”

“U-Un… come…” 

I slowly pushed the uribou forward. Perhaps because of the rubbery material, it made a tight, squeaking sound as it rubbed against the uribou, but I somehow managed to get it about halfway in.

“S-Sakura-sensei… I… I can’t do it right…”

Then one of the female students raised her hand to get the teacher’s attention.

It was Kokonoe Touka, the girl with pink hair and glasses.

“It’s okay. I’ve prepared some lotion just for a time like this.”

Lotion?!

Even that?!! 

Even as I was taken aback by how well-prepared it all was, I honestly thought that if sex education were this thorough, it might actually be useful back in my original world too.

Still, it was way too erotic—if they didn’t separate boys and girls, it felt like things could get seriously out of hand.

Then, Sakura-sensei took out a bottle of lotion.

As a thick, viscous, transparent liquid squirted from the tip, she coated the uribou with it.

The way Sensei handled the uribou as she coated it in lotion was so lewd that I felt as if my own lower body were being touched, and I inadvertently ended up with a semi-erection…

Then, as she inserted the lotion-smeared uribou into the condom, it slid all the way inside with a smooth, effortless glide.

“Wow…”

“See? When it’s all wet—I mean, when it’s hard to get it in, it’s perfectly fine to use lotion, okay?”

She definitely just tried to say ‘when you aren’t wet’!

As I thought, that keyword really is just too lewd…

It looks like Sensei also tried to avoid saying it too.

“Have you reached the very end? Once you have, give it a firm shove as if you’re breaking the hymen. Use that mental image to pierce through the bottom of the condom, okay?”

It might be too late to say, but this class is seriously messed up.

I never imagined I’d be forced to practice breaking a hymen.

Wait, weren’t there some classes with only one male student? Does that mean he has to pair up with female students to do this practice together…?

“Aoi, I’m going to go in hard, okay?”

“O-okay.”

As Aoi was the holding the condom in place.

I strongly pushed the uribou I held in my hand further into it.

Then, I felt a small tear through my hands, and when I looked, the tip of the condom had been pierced by the uribou.

“Kyaa…! It broke.”

“So that’s how you break it…”

“My hymen has been pierced~♪”

Some people were surprised, while others watched with admiration.

And there were also those who found it amusing.

Asuka, in the seat in front of me, was one of them.

She’s playing the “Piercing Hymen Game” with the girl next to her.

Right now, Asuka was holding the condom while the uribou was thrust deep into it with a wet squelch.

“I-I’m going…”

“Yes. Come…”

The tip of the uribou pressed hard against the bottom of the condom Asuka was holding, and then—with a sharp pop—it tore right through.

“…It broke.”

“It did, ahaha…”

No, no, no, no! This is way too lewd!

I’ve never seen Asuka blush like that before!

Damn… I want to play the “Piercing Hymen Game” with Asuka too!

Still, there was one thing that bothered me about this “Piercing Hymen Game.”

Is a condom’s durability really that low?

Ah, wait, I see. If I think about it, these weren’t made for a man to put his dick in.

That’s why they break so easily.

But even for women, when they use rod-like devices like this, do they use them directly? Don’t they wrap them in a condom first?

I think that would be more hygienic and safe, but perhaps there are also specialized condoms made just for that. …Maybe I should ask Nee-chan about it sometime.

“And with that, class is dismissed for today~! If there’s anything else you’re curious about, I’ll be more than happy to give you a private, thorough ‘tutoring session’ and tell you everything you want to know. Ufufu~”

Sakura-sensei had given us a detailed explanation on the uribou and the proper technique for piercing the hymen.

As the bell rang and class came to an end, I breathed a massive sigh of relief.

For the record, I also had my turn holding the condom while Aoi pierced my hymen with a sharp pop.