Extra 6

I think the relationship between Sis, David, and Delamain is warped.

Normally, Delamain acts as my bodyguard, secretary, and stand-in CEO—basically filling the role they once had with Sis, now applied to me.

That means I should be the one who knows Delamain's behavior best... and yet...

...Sometimes, I see the three of them entering Delamain’s room together and not coming out for one to three hours.

...Isn’t their relationship way too indecent???

“So yeah, that’s the situation. Got anything to say?”

“Uh, ahh… well, yeah, things have kind of been a mess, or not… but, yeah, that’s the kind of relationship it is.”

I dragged Sis, who came to check on me, into my room to dig for the truth—but instead of regret or reflection, I got the kind of reaction someone has when a family member catches them indulging in a guilty hobby.

“Well, it all started when Delamain saw David confessing to me up on the rooftop and, for some reason, awakened a BSS-type NTR fetish…”

“Come again???”

“Ah, right, BSS as in, ‘but I liked them first,’ a type of NTR—netorare. It’s a Japanese kink where someone experiences unrequited love and sees the person they liked end up with someone else.”

“I didn’t ask for a terminology lecture?”

“Right, well, basically Delamain felt conflicted and messed up emotionally, like they were sad David stole me, but also happy for us. So I decided to introduce them to Japan’s sinful subcultural kink scene… and, well, this happened.”

“Why though???”

“Well, Delamain’s only about four years into being a person, right? They have this tendency to try to logically or ethically rationalize emotional fluctuations. I tried explaining it casually—‘that’s just how it is’—but they couldn’t grasp Japanese kink culture.”

“And?”

“So I thought, ‘If someone they liked loses their virginity to their best friend’s girlfriend, maybe they’ll understand how dark and twisted those feelings can be.’ So I called David, and we did a live demonstration.”

“Do you not have a heart? Couldn’t you go a little easier...?”

With a mischievous and sultry smile, Sis—who just trampled over someone’s emotional stability like it was nothing—stuck out her tongue in that teasing ‘tehepero’ pose.

For a moment, Sis looked like a succubus or something.

Can she please think about how traumatic this kind of sexual story is for her little sister?

“You didn’t feel bad for David?”

“Well, he also had some feelings for Delamain. So I tempted him by saying it was to teach Delamain about new emotions, and that led to the threesome that took Delamain’s virginity.”

“Do you realize that’s the work of a cold-blooded sadist, Sis?”

“But think about it: Delamain gets to sleep with someone they like—me—and that joy smothers any guilt or regret in a haze of lust. David is happy his best friend found fulfillment, twisted as it is, and since we’re open about our relationship, he doesn’t have to worry or get suspicious. And I get to watch these pure, noble feelings become corrupted by carnal desire—it’s incredibly stimulating to see them emotionally swaying between positive and negative feelings. See? No problem, right?”

“This is some unhinged doujin-level logic you’re working with, Sis???”

Maybe getting a new body made her less careful about how she treats herself, but does she really have to drag me into witnessing her spiral into sex addiction?

If she’d gotten together with David before all this was resolved, wouldn’t that basically be a BAD END?

All I can see is a future where she chains David down and drowns in lust with no escape in sight.

“Wait, what about Rebecca and the others who like David?”

“Hm? There’s no way I’d let those two get involved in that. If there’s even a small chance of David getting stolen, that’d be a problem. I’m just feeding them scraps to keep them in check. I gave them sex BDs of me and David—build that fetish where you hear someone else’s name during sex, feel jealous, but still get off from it.”

“Could you not weaponize your sexuality just to intimidate your rivals?”

“Come on, it took a lot to get Delamain to sleep with me in the first place—they resisted so hard I had to edge them for ages before they finally gave in. Adding those two into the mix would just overwhelm David.”

“Am I the only one who thinks David was already overwhelmed by just Delamain?”

“Also… having two big ones inside at once is quite the experience. The way their hips move shows how much they love me, and I can really feel it. Seeing them compete over me like that is just irresistibly sweet…”

“Your next life is definitely going to be as a succubus, Sis…”

Please don’t hit me with deep, dark confessions at the very end—I'll catch a cold from all this.

Right… I grew up normally in my old mind-space when I was still a brother, but Sis lost those memories as she became who she is now. Her memory’s basically minced meat now.

Even if she had a happy family in her past life, that’s all gone now. All that’s left is the twisted childhood she spent with Mom pretending to be Dad.

Spending time with Mom, whose mind was starting to crack, was honestly closer to being imprisoned.

I studied ripperdoc work to help Mom, who constantly trembled in fear while working outside, and eventually, our roles reversed—Mom mentally declined until… well, we know how that ended.

Just like Adam only felt truly alive in death matches, maybe Sis can only feel truly loved through sex.

So she’s keeping David and Delamain—who she believes truly love her—completely locked down with her body, making sure they can’t escape.

…It’s sort of like a side effect of burning her spirit out in the battle with Saburo. Even though her body changed, her memories and psyche stayed connected, and this is the result.

Wait, so David and Delamain already figured that out, and that’s why they’re doing everything they can to love and support her…?

“And then there’s Delamain, too. They said something dumb like, ‘If there’s no chance of winning, it’s better to endure than to confess and get rejected.’ If they had spiraled into the darkness from that, it would’ve been a serious problem.”

“…My condolences, Delamain.”

“So, what do you think, me?”

“Think about what?”

“Didn’t Wakako say that the basis for love is, ‘Could I have this person’s child?’ If it’s David or Delamain’s kid, I wouldn’t mind giving birth, but—oh wait—Delamain’s biological data is originally from you, right? Wouldn’t that be me impregnating myself? …Does that count as incest…?”

Wakakoooo!?
Your values have really messed up my sister here!!

Since Sis only knows about twisted, decadent romance from Jig-Jig Street, she’s taken Wakako’s words—someone she trusts and sees as experienced—completely at face value…

Well, if she starts heading down a weird path, I guess David and Delamain will stop her.

…Even if they’re already doing that scandalous threesome thing. Hmmm, maybe I should find someone for myself too.

Since I’m the CEO of Delamain Universe, I’ve apparently been getting a ridiculous number of marriage proposals, but a political marriage like that? No way…

Anyway, I’ve at least figured out what’s going on with Sis and the others.

This definitely isn’t something a little sister should get involved in…