The moment I revealed the truth, it felt as if time had stopped. Kokonoe and Aoi looked at each other in silence.

…Well, of course.

There was no way anyone could believe it under normal circumstances.

Even now, I still wish it were just a dream.

“…But if it’s true, then some of the things you’ve done start to make sense.”

“When you think about Kazuto-kun’s behavior… where he could’ve learned all that… yeah, it does add up.”

What came back wasn’t suspicion, but rather voices of understanding.

They hadn’t accepted it completely, but they didn’t reject my story outright either.

“Thank you. But normally, it’d be strange not to doubt it. You don’t need to fully believe me. As long as you’re open to it, that’s enough—Still, what I’m about to talk about is a world of men you’ve never known. If you’re okay with that, I’ll continue.”

Kokonoe was probably the one who wanted to know the most.

Aoi had been dragged into this more by circumstance… but he was kind, and by now, a close friend.

He’d been fascinated enough just by the nickname chinchin, so he was probably interested in learning more about men as well.

“I want to know! That’s one of the reasons I enrolled at this school!”

“Me too…! Please tell me about the boys from Kazuto-kun’s world!”

The two of them looked at me with their brightest eyes since the day we met. 

“Alright. Then I’ll start—In the world I used to live in, the ratio of men to women was almost fifty–fifty. So unlike this world, men were common, and just like it said in those books, it was normal for men and women to have sexual relationships.”

“So many men…”

“If I’d been born in that world… would I have been treated differently, I wonder…”

Aoi murmured that honestly.

He’s a beautiful boy, so if he’d lived in my old world, it wouldn’t have been strange for him to get scouted by the entertainment industry.

“There was no classification like ‘inferior species.’ Men and women talked normally and got along, too. The day before the entrance ceremony, I confessed to Otomi Asuka, and she accepted my feelings.”

“…Then does that mean you were dating?”

“Yeah. But the next morning, the world had changed. All of Asuka’s memories of me were completely gone… and our relationship was treated like it never existed.”

“So that’s why you kept trying to talk to her on the day of the entrance ceremony…”

At last, the two of them seemed to understand why I was so fixated on Asuka.

I don’t intend to change the world or anything like that. I just want to talk to her the way we did back then.

I want to become lovers again, the same as before. That’s all.

“I-I… I’ll do my best to talk to Otomi-san!”

“…Don’t force yourself.”

Kokonoe’s enthusiasm is probably going to backfire, so I really want her to rein it in a little.

“—Since we have the chance, why don’t we start with what’s been on Kokonoe’s mind today? It ties into the books, too.”

“Oooooooh…!”

Kokonoe was so happy she was practically trembling.

She might’ve become beautiful on the outside, but her excitement and movements were still… kind of unsettling.

“By the way, how do animals work in this world? Do males and females still mate?”

“Y-yes… they do, normally.”

“Then it’s easier to think of it as humans being the only ones who stopped doing male and female intercourse. Regardless, there are a few crucial parts of the process you need to understand.”

It feels a bit strange for someone with zero experience to be explaining this… but the general idea I got from manga and videos is probably right.

“First—erection.” 

I said it with a straight face.

“Do animals also get erections?”

“Um… that’s what it says online.”

“Then that makes this easy. In order to insert it into the female genitalia, the penis has to be hard.”

After all, you can’t exactly get it in if it’s all soft.

“Aoi, surely you’ve experienced it yourself, right? Like in the morning—don’t you ever wake up with an erection?”

“Eh-ah… m-me!? W-well, in the mornings it does get strangely hard sometimes, and it makes it hard to pee… b-but after a while it settles down, or something…”

“Have you ever jerked off?”

“Eh… jerked off?” 

…Seriously? 

Even Aoi must’ve had moments where seeing a woman stirred something in him.

No matter how used you are to this world, you can’t completely suppress basic bodily reactions.

Still, if male function itself has weakened, then maybe those urges have dulled as well.

That’s when I quietly took out the uribou I’d been keeping hidden at the bottom of my bag.

“’Shiko-ru’… well, I’m sure women have something similar, but it’s what guys call masturbation. You wrap your fingers around the penis like this and move them up and down. In the world I came from, we called it ‘shiko-ru’… probably because of the ‘shiko-shiko’ rubbing sound it makes.”

“I see… so men do something like that… it’s kind of hard to imagine, isn’t it?”

“I don’t know why… but just hearing about it is making me feel a strange tingling down there…”

I used the Uribou as a substitute for a chinchin, moving my hand slowly in a ‘shiko-shiko’ motion to show her how it was done.

They both held their breath, watching intently. 

“Animals have similar reactions, too. It’s just that humans get them as a morning physiological phenomenon, or when aroused. And when you do that ‘shiko-shiko’ motion, sperm is released from the tip—that’s the ‘seed.’ When it enters the woman’s egg, a child is created.”

“The mystery of life… To think a world like that really existed…”

Of course, none of that happens in this world.

The very fundamentals of biology are different.

“In other words, jerking off is like a simulation of the actual act. During the real thing, you perform that same movement inside the female genitalia to reach climax and release the sperm… That’s what it means for a man and woman to ‘mate.’”

That should be more than enough explanation for today.

Honestly, I’d started to wonder why I was giving such a serious lecture on something like this.

“U-um… I have a question! D-does the penis… ever get smaller as well?”

“Hm? Oh, it’s normally small. It only gets larger when stimulated or aroused. That’s how it works for other animals too, I think.”

“S-so… that time… the reason it was small was… because…”

“That time?”

“N-no! It’s nothing!”

Was she talking about that time I was unconscious in the infirmary…?

Well, of course it’d be small while I was asleep, but by the time I woke up, I was already rock-hard…

And now that I’m remembering the sensation of what Kokonoe did to me, I’ve started getting restless too.

Even though I like Asuka, what she did felt so unfairly good. Just remembering it makes my insides burn.

And now Kokonoe looks even cuter than before.

If she did the same thing to me now… just imagining it is dangerous.

“The world of men is… well, complicated. There’s no way I can cover it all today, so let’s leave the rest for another time.”

“T-today was really educational…! I’m glad I got to meet you, Fukase-kun…!”

“Me too… listening to Kazuto-kun’s stories helped me feel a bit more confident about myself.”

…Good. 

It seems it was a proper learning experience for them.

But looking back on it… all I really did was talk about perverted stuff with a straight face.

Well, I got the point across, and seeing how the two of them reacted… I feel a little lighter.