About Incest

In the middle of preparing for the B-Class match, one day…

That reminded me. Something suddenly came to mind, and I went ahead and asked.

"For Lasheid, Safa was his blood sister, he said. Are sibling Master-and-Garumon pairs not all that rare?"

"It's something only nobles can really do. S-Class Masters keep nothing but UR-Class Garumon.

"Garumon born from excellent Garumon have a high probability of becoming excellent Garumon themselves. There are of course cases where the Master uses mother and daughter side by side, but if there's a son, there are also cases where the daughter is handed over to the son."

"I see. Ah, um… what was it. Right, school.

"Garumon and Masters go to school, and you graduate by getting a Garumon, right?"

"Yes, that's correct. There's compulsory education, so once a child turns six, they're enrolled in school. After that, parents are barely involved with their child's Garumon or Master career.

"In the case of nobles, however, compulsory education is waived.

"From early childhood, they receive an elite education as Master or Garumon, or they set out with an excellent sister as their initial Garumon. Those who set out with such advantages are called nobles."

"It's not fair that only Lyuka gets to explain, I want to explain too!"

At that, Yuria volunteered.

"… Go ahead."

"Even nobles sometimes enroll their children in school. Can you guess when?"

"Hmm… what could it be. Maybe when there isn't a sister? Garumon children are hard to come by, right?

"There's no guarantee there's a sister of just the right age."

"Oh, as expected of Naoto, correct! … Wait, that was a quiz, not an explanation… ah, right, right. There are also cases where the school requests it.

"Schools are institutions for cultivating Masters, so producing excellent Masters gives them prestige.

"If they take in noble children expected to have high ability, the school lands a future excellent Master with no effort.

"And the Master's side does it for the merits too.

"Like, suppose an UR-Class Garumon happened to enroll at that school. UR-Class Garumon are pretty rare, so you can't easily get hold of one. If enrolling means you can get one, then sending a child for nine years of school is well worth it.

"So you get conversations like, 'Our school had an UR-Class Garumon enroll this year, milord. Here, a yamabuki-colored manju.' 'Oh, in that case I shall entrust my child here. There's no sister of the right age anyway…' That kind of thing gets exchanged all over the place during enrollment season."

So Yuria explained on my behalf.

"Heeh… I see."

It was a fascinating explanation.

"Mfufuu. I got an 'I see' out of Naoto too, ha."

Yuria looked happy as she said that.

"Eh, do I say 'I see' that much?"

"No, it's just that you listen to explanations like you're really enjoying them, Naoto, and it makes me happy.

"I want you to get more and more used to this world, but if there's nothing left to explain to you, that'd be a little lonely."

"In that case, when the time comes, just tell me what you're thinking about; anything makes me happy."

When I said that…

"… Want me to tell you what I'm thinking right now?"

"… Hmm?"

"'I'm crazy in love with this guy.'"

"… I-I see."

I really was glad. She'd splendidly proven my own statement.

"Nobles… B-Class and above counted as nobles, right? Which means once Naoto becomes B-Class, we'll be able to raise our own children at our side without sending them to school."

Kanan was double-checking.

"Yes, that's correct."

Lyuka answered.

"Fufu… another reason to hurry and become B-Class! There's no way I'd hand our daughter over to some Master of unknown stock!"

That was Kanan… Um, do you realize? You're already completely talking about getting pregnant with my child…

"… Um, let me ask again… in this world, the taboo on incest really doesn't exist?"

Another question.

"A-ah, um, just as a general matter. I-it's not like I'm thinking anything in particular about Setsuna or…"

I asked, making excuses.

Setsuna was listening seriously too.

"In this world there's a word for incest as well. Mother-Garumon, daughter-Garumon, sisters born from the same mother, sisters born from the same father, sisters born from the same parents, and direct grandmother-and-granddaughter. Having sex with a Garumon within those second-degree relations is called incest. The mother's sister, a sister's daughter, and so on, as long as they aren't your seed, those aren't called incest.

"And as for the way of thinking that treats incest as taboo, I hear that exists in your world…

"In this world, it doesn't."

"… Oh!"

I almost shouted "wonderful!" before I caught myself.

"… E-er, why? On Earth, common sense says there aren't many societies where incest is accepted…"

I was the one asking, but "why" wasn't really the right way to put it.

The basic premise was that everything was free, and if anything, there'd be a reason for things to be prohibited.

… As for there being few countries on Earth where incest was permitted, I had researched that before.

That's right, I'd looked into it back when I'd thought, if there's a country where I can marry Setsuna, I'd want to immigrate someday!

"For one, it's probably because there are no problems. In your world, repeating incest seems to cause some sort of issue, but in our case, even if you keep impregnating Garumon down through the generations, there's no issue at all."

Lyuka offered her best guess at the underlying cause.

"Far from being a problem, incest tends to thicken the bloodline and produce more powerful Garumon. Bodily compatibility is also good, so it's actually preferred, if anything. The Garumon born from N-Class Garumon are mostly N-Class, but very rarely a high-rare Garumon will be born. Inbreeding is said to raise that probability.

"… The highest Garumon rarity is currently UR-Class, but if anything higher were to appear, people say it'd come from inbred Garumon."

Yuria added.

"If the trend's that clear, wouldn't everyone end up only inbreeding? Then there'd be a lack of diversity… If you cross AB, you get AB and BA, but crossing AA only produces AA. Wouldn't you end up with nothing but a single type of Garumon?"

"A Garumon's abilities change drastically depending on how she's raised. Even with identical genes, the skills she learns are entirely different depending on the upbringing, and even her element shifts. So diversity is preserved. Even if the whole world went all-in on incest, there wouldn't really be a problem.

"For the sake of diversity, there's even a system that transfers and reincarnates Garumon from other worlds.

"In practice, though, there don't seem to be that many Masters who desperately want to monopolize their own daughters.

"For non-nobles, securing blood relatives is plain difficult.

"Even among nobles, in many cases the daughter gets handed down to a subordinate to deepen the subordinate's loyalty.

"In theory it's possible, but in reality it doesn't really play out that way."

Lyuka explained.

"By the way, in this world, a motherfucker who beds his own mother is treated as a kind of honor. Can you guess why?"

Yuria threw out a question.

"Eh, eh…? On Earth, that's considered the worst kind of insult… I don't know."

"Of course, cases where a man becomes his father's subordinate and is permitted to have her, those aren't honorable.

"To violate your mother without your father's permission, you have to defeat your father in a Garumon Battle and steal your mother away. For all Masters, the father is a wall to eventually overcome. If you can defeat him, you've proven that you've surpassed him: an honorable, fully-fledged Master."

"Ah, I see."

Oops, I'd said it again.

But Yuria looked really happy, so it was fine, I supposed.

"Even though Setsuna-san is right here… do you really intend to go back from a world that recommends incest, to a world that prohibits it?"

… Lyuka pressed me on it.

I couldn't answer.

"Well, there are cases where the prohibition makes things hotter, I think…"

"No, that's not the kind of fetish I'd go back for!"

But still… if I really wanted to be united with Setsuna, this world was the ideal world…

"With Onii-chan… incest…"

Setsuna voiced it dreamily as well.

The little sister I cherished most in the world, doing such a thing… but in this world…

I ended up in a fitful, conflicted state.

… Night.

"… Onii-chan, can I sleep with you?"

With that, Setsuna came to my room in her pajamas, holding her pillow.

… A scene I'd seen many times back in Japan. We were close as siblings.

"Yeah, sure."

I answered the way I had many times before.

Quietly, su, Setsuna slipped into bed beside me.

In Japan, we'd talk a little like this and then drift off to sleep…

"… What's wrong?"

I called to her like before.

… To be honest, my pure family love from before hadn't changed, I thought… but lately, lust completely outweighed it, and to keep my hands off entirely was a bit harsh.

But the fact that she was beloved family hadn't changed at all.

So if Setsuna said she had something to tell me, I'd hold off the lewd stuff and listen.

… In my own mind, that was an enormous expression of family love…

I mean, it was Setsuna, you know? With a little sister with such a lewd, cute body sleeping right next to me, holding back from doing lewd things, if that wasn't pure family love, what was it? … Well, maybe it just meant I'd changed too.

"Yeah… Onii-chan, do you want to go back to the original world?"

"…!"

What Setsuna asked… was something I'd been unconsciously, or rather consciously, avoiding having a proper discussion about with everyone.

Maybe she'd come, as my little sister, on behalf of everyone.

"… But, Setsuna, I think you should go back."

Setting myself aside, I addressed Setsuna's situation.

"Onii-chan…!"

"Because Setsuna, you have incredible talent on the violin…! You're recognized internationally, with a future ahead of you… Setsuna, you can shine in the original world. A Setsuna like that…

"trapping her in this world, I can't think it's right."

"…! Is that what you want, Onii-chan?"

"… Yeah."

"Really? My being active as a violinist, is that really… what makes you happy, Onii-chan?"

"That's, of course it is…!"

"But… in Japan, I was lonely, you know?"

"… Eh."

"From morning to night, violin lessons. Once it was competition season, I couldn't come home for days…

"There were times I didn't get to see you for a week, Onii-chan."

"Setsuna…"

"The reason I got so absorbed in the violin was because you told me I was amazing, Onii-chan, that I had talent.

"You cheered me on like that…

"I worked hard because it made you happy, but the harder I tried, the more distance grew between us…

"I started not knowing anymore.

"I do love the violin. But isn't just playing it not enough?

"If I could play at your side, that alone would have been fine for me…"

Setsuna said, a little sadly.

"Setsuna… I… I love you so much, I think only of your happiness.

"Setsuna, you have talent, so a future that makes use of that talent is what suits you, I thought."

"… But, when it comes to violin talent, there are plenty of girls more skilled than me. There are some in Japan, and even more around the world. They make a big deal out of me being cute or whatever, but in the competitions I won, if you closed your eyes and just listened, the rankings would flip… I hear that all the time."

"… T-that's…"

… That was certainly true. Setsuna's talent was world-class, but not world-top-class.

Even within her generation, there were people above her. Once she entered the professional world, where you compared across generations… she might not stand out at all.

Well, in beauty, no one rivaled Setsuna though.

Which meant I… was wrong? I'd been thinking about the place where Setsuna's talent could best come alive…

But maybe I didn't necessarily have to fixate on her violin talent…?

"Onii-chan, between watching me play violin on the other side of a TV screen, and like this, holding me in your arms, kissing me, touching me… which makes you happier?"

"T-that's… well…"

I, too… had felt the distance between Setsuna and me, and gotten lonely about it more than once or twice.

Not being able to see Setsuna, being lonely about it… that was the same for me.

"… I…"

I was about to give an answer… and shut my mouth.

"… For now, at any rate… until I've properly established a way back, I don't want to say anything.

"I don't want to use it as an excuse to give up on getting back."

That was all I said.

"… Mhm, I get it. That's fine."

Setsuna smiled at me.

"… Then, is the conversation done for now?"

"Mhm, I'm okay."

"… Then… we can do l-lewd things, right?"

"… Mhm, of course."

I climbed on top of Setsuna and, puchi, puchi… undid the buttons on her pajamas.

Purun…

Her big breasts, with nipples standing at the tips, were exposed.

"Ah, ahh… Setsuna… you're beautiful…"

"… Ehehe, Onii-chan, since coming to this world… you've gotten honest, haven't you.

"In Japan, you'd never have done anything like this…"

"Y-yeah… well, it's everyone's fault… or thanks to them. I didn't know a girl's body was such a wonderful, pleasurable thing… When Yuria and Haru get fellatio from Setsuna, I can't possibly hold back…

"Plus, well, I've gained confidence in myself. Now I felt I had the right to touch someone as beautiful and wonderful as Setsuna…"

"Ehehe, that's good, I think. You're really wonderful, Onii-chan, but you never had any confidence in yourself…

"If only because you've gained confidence… I really love this world for that alone."

I kissed Setsuna.

Chu, rero, chu, kuchu…

Setsuna and I had kissed many times in Japan, but of course, the kind of fervent tongue-tangling kiss like this only began after coming to this world.

Tongue tangling against tongue, sucking and sharing saliva, a fervent kiss…

The taste of Setsuna's sweet lips was like ascending to heaven.

… Of course, I couldn't ascend on this alone. Next came… her breasts.

Munyu, munyun…

"H-aah, ahhh, ahhhh…"

Setsuna let out a sweet, high cry. Soft breasts, with the most wonderful texture and feel for kneading, the best breasts…!

Truly, the iron self-control I'd had to keep from touching breasts this wonderful was, even now, unbelievable.

Living under one roof with breasts like these, you know? How had I gone without touching, without licking them…

Chu, chupa, chu…

I didn't just knead Setsuna's breasts, I sucked on them in earnest.

Aaah… it felt good. Sucking breasts with my mouth, what a wonderful feeling.

Like cotton candy or marshmallows that didn't run out no matter how much you licked.

No, this was something far more pleasurable than those, but in the way it spread that happy feeling in my chest, like the sparkly excitement of a festival when I'd licked something as a young child, somewhere there was a commonality.

Breasts… aah, I was happy…

… But if it had really been the happy feeling of childhood, my penis wouldn't be this rock-hard erect.

I'd already entered an extreme state of arousal where I wouldn't be satisfied without sex right now.

"Haa, haa… onii-chaaan…"

Setsuna, already stripped fully naked, let out sweet sighs.

Fully naked meant, of course, that between her legs there was an omanko… If I inserted my rock-hard erect penis there, even between siblings… we could have sex.

Of course, that was only if Setsuna would accept me from her heart, but…

I lightly traced the tip of my penis along the entrance to Setsuna's omanko.

When I'd brought it close to Leone before, who was forbidden, I couldn't even get this close.

So Setsuna had already become willing to accept me.

"Ah… Onii-chan…"

Looking a little scared, Setsuna said in a trembling voice.

"… It's all right. I won't put it in…"

"… I see…"

Setsuna's voice held a touch of relief and a touch of disappointment, I thought.

I wanted to too. I really wanted to. I wanted to right now.

But not yet…

"Then, the usual one… please."

"Mhm."

Setsuna lay flat on her back, faced up, and opened her mouth wide.

Except for Leone, I enjoyed this mouth-sex with everyone every night.

I inserted my penis into Setsuna's beautiful mouth.

Labia majora, labia minora, and lips. The reason both got the kanji for "lips" had to be that, beyond the resemblance in shape, their function was similar too, didn't it?

The function of taking in a man's penis like this, and bringing him the greatest pleasure.

Jupu, nuru, nupupu…

Once my penis entered her mouth, Setsuna pursed her lips, tangled her tongue, and stimulated my penis.

It was a little like the squeeze of an omanko, and felt incredibly good.

Just like that, deeper. Past her tongue, and… screwing my penis into her throat-flesh.

"N, nn…"

Setsuna let out a strained nasal breath. When I screwed my penis from mouth into throat like this, it became hard for her to breathe.

… But we'd gotten quite used to this mouth-sex by now, so these days, oxygen deprivation didn't happen all that often.

First, I screwed my penis in to the base. There, gyuuuu! I was firmly squeezed by her throat, and it felt amazing…

Once I'd savored it for a moment, I quickly pulled out before it got painful.

The sensation of pulling out felt good too. The catch of her throat was unbearable.

"Nnn…!"

When I pulled out, Setsuna got a breath in too.

… Right, if you assumed it must hurt and moved your hips too slowly out of timidity, the period without breathing only got longer, and it became harder for her.

Screwing in deep, almost roughly, then pulling back. Doing this piston motion at a speed only slightly slower than the speed used in omanko or anal sex was actually best.

Jupu jupu jupu…!

And so, I savored sex in Setsuna's mouth.

The difference from regular sex was that, naturally, omanko felt even better… that couldn't be helped. But for the purpose of ejaculating, the pleasure was more than sufficient, so no problem there.

Plus, the way her big breasts went tapun, tapun trembling and bumping against my belly munyo, munyo was a sensation you couldn't really get with regular sex, and that felt good in a different way.

This was the merit of mouth-sex, and it felt good, so even with Leone, with whom regular sex was possible, I liked having mouth-sex with her too.

Plus… when I hugged in close, her omanko came right in front of my face.

While I was thrusting my penis in and out of her mouth, she couldn't speak, so I had no way of telling whether she was feeling good or not.

At times like that, by gazing at her omanko, you could see her response, like getting strongly wet and squirting out love juices, so even without using her mouth, you could roughly tell what she was thinking.

… What I really wanted was to lick her omanko and do sixty-nine, but if I licked even for an instant, with my penis lodged deep in her throat she'd be unable to move for a while, raising the chance of her passing out from oxygen deprivation.

If I made her pass out from that, I couldn't very well tell the doctor, "I shoved my dick down her throat and was licking her omanko, so I made her pass out"…

"Haa, haa, ahh… Setsuna, I'm coming, I'm gonna come, nn!"

I said, and gave a final thrust!

Dopyu dopyu, doku doku dokun…!

And then, I poured semen down deep in her throat in throbbing pulses.

"N, nnn…!"

Biku biku bikun…

Setsuna seemed to have reached climax too.

"… Pwah…"

I pulled out. Since I'd poured semen straight from her throat into her stomach, unless I went many rounds, semen rarely flowed back up to her mouth.

The times when semen did overflow from her mouth were when, in the process of pulling out, the last bit of semen left in my penis got squeezed out by her mouth and ejaculated in there.

"Nn…"

Toro…

This time too, a bit of semen overflowed from the corner of Setsuna's mouth.

… Even after ejaculating, getting cleaned up by the squeeze of her mouth… that was another merit of mouth-sex…

"Haaa… it felt good, the back of my throat, getting jabbed zubo zubo by your dick… it felt so good… Onii-chan…"

Setsuna told me, looking dreamy.

For humans too, was the back of the throat an erogenous zone…? Maybe it was something only Garumon had.

"… Fufufu, good. I… felt incredibly good too."

I held Setsuna close.

When going to sleep at night, I'd already done plenty of lewd stuff with everyone, and this was a sort of after-hours bonus, so I'd hold off on any more.

My HP dropped by 1 again.

In my current natural physical condition, my real limit was apparently about 7 times a day. And that itself was probably because my stamina and vigor had somehow increased since coming to this world.

On top of that, HP had been added like a plug-in cartridge.

For a C-Class Master, the HP portion was 18 times in total.

Which meant about 25 times a day was perfectly doable.

Three times each for eight companions.

… And the leftover one, I'd just done with Setsuna, I supposed.

… Well, even from here, if I pushed myself, I could probably manage more.

But pushing yourself wasn't a good idea, so I'd make sure to sleep properly.

"… I'm… so happy right now.

"Onii-chan is here… and my beloved companions are here…

"Garumon Battles are fun.

"I can play violin to my heart's content, and everyone listens raptly, and there are all kinds of effects… it's much more fun than just performing normally…

"For me, far, far more so than the original world…"

Without finishing that thought, Setsuna eventually began breathing softly in sleep.

Once we became B-Class, the prospect of returning to the original world would, at last, come into view.

If that didn't pan out, we'd just resolve to settle here permanently.

But if it was possible… which world should we choose?

… Even so, as long as we weren't separated from our current companions, surely it wouldn't be all that bad.

But a world where I could stand proudly with Setsuna, married, and present "this is mine and Setsuna's baby" with my chest puffed out… that was surely only on this side.