Somehow I Ended up Dating the Perfect Female Classmate, but My Sister Found Out and They're Turning Into Yanderes

Chapter 97: Branching Point

“Won’t you come with me?”

“……”

Huh? Uh, meaning…?

In this context, “come with me” means I’d be going to the girls’ dorm with her!?

“Right now I hold the real power in the Shinkai Girls’ Academy girls’ dorm. Even if I bring one boy in, there won’t be any problem.”

No way, that’s definitely gonna be a problem!
Sneaking a guy into a fancy all-girls school dorm would probably make the newspaper.

Also, what does “hold the real power” even mean?
Did Satsuna buy off the dorm leader or something?

…The scary part is that Satsuna would totally do that.

“Uh, but school…”

“You can just drop out. Since you’ll be living at my feet forever, you don’t need any education.”

Oh, looks like my freeloader options just increased again.

“I’ve already decided to spend my university years in the girls’ dorm instead of at home… if things stay like this, the next time I can live with you again will be in six years… or maybe my future job will be somewhere far away from here.”

She’s already thinking about her job too…

Well, yeah, she’ll have to support her freeloader (pet), so she needs to earn money.
She might even get transferred overseas with some foreign company.

“If that happens… I might never see you again in my whole life.”

Satsuna’s voice gets quieter.

“…When I was little, I was a normal girl.”

Was she?

“I played with my friends, fought with my siblings but also helped them, and looked forward to going out somewhere with the family. Just an ordinary girl you could find anywhere.”

I only have the image of Satsuna as a super sadistic young lady, so I don’t know that normal little-girl version of her at all.

“But… at some point I switched from the side that plays with everyone to the side that controls them. I don’t really remember what caused it anymore.”

The trigger that turned Satsuna into a young lady…
…I’m kinda curious about that.

“However… deep in my mind it’s carved that you, Brother, were the one who caused it.”

Eh? Did I do something?

“In other words, you are the one who created the ‘me’ that exists right now.”

Maybe my masochistic moves unknowingly made Satsuna’s heart flutter?
I really am a sinful guy.

“You have a responsibility for giving birth to ‘me,’ Brother.”

The way to take that responsibility is…

“So, Brother… will you run away from this house and spend the rest of your life with me?”

Obviously that’s the only option.

Even though she’s talking about taking responsibility, it sounds more like she’s begging than ordering.

…Wait, am I kinda getting reverse-proposed to right now?
“Spend the rest of your life with me” means that, right?
She sounds weaker than usual, which makes it feel more real.

Is this a super important branching point?
Like in gal games where you choose which heroine route to jump to.

I’ve been nodding along like I understand what she’s saying, but I actually don’t get it at all!?

She says I turned her into a super sadistic young lady, but I think her true nature just came out.
Plus, I don’t have any memory of her ever being a normal girl.

Still, I gotta give her an answer.
To this irreversible choice.

“Sorry, Satsuna, I can’t do that.”

“……”

Of course I’m picking no.

Living with Satsuna would probably make my life fulfilling in a lot of ways.

I’d get my dream freeloader job, get treated like I have no human rights—pretty much a rose-colored life with only pluses waiting for me.

But… suddenly disappearing in my current situation isn’t realistic, and the risk is way too high.

Satsuna said she holds power in the girls’ dorm, but if one of the high school girls there leaks a scoop, I’d lose all social rights.

And there’s a chance one of my leftover sisters or Kirino would come chasing after us.
If it gets out that Satsuna took me, it’d be the end for both of us.

“I thought you would say that, Brother.”

Even though her pet rejected her, Satsuna has this slightly self-mocking smile.

“Really, refusing to come with your owner… you really are a hopeless dog to the very end, Brother.”

Satsuna pulls her face away from me and flops down onto the bed like she’s collapsing.

“Come here, you useless dog.”

She yanks the leash with even more force than before.
I let myself get pulled and lie down on the bed too.

“Once I leave, this collar will probably get taken off. So I’m going to leave another mark that proves you’re mine.”

Satsuna removes the collar from my neck.

“Well then, time to eat.”

“Huh? Eh, wai—”

Before I can figure out what she’s about to do, Satsuna sinks her teeth into my neck.

“Ugh—”

So she finally turned into a yandere vampire young lady…

“——————”

The feeling of getting bitten on the neck sends a completely new kind of pleasure rushing through me.

The more I think “I’m currently being trained by a yandere vampire,” the more nutrition flows to my son.

While savoring this pleasure that’s dragging me into new territory, I kinda wished there might be a world line where I actually choose to run away with Satsuna.

—

Chapter 98: The Little Sisters’ True Feelings Toward Their Oldest Sister

“My, it’s the last breakfast and it’s the same as always.”

August 29th.
Satsuna has to head back to the dorm today.

“…If we made breakfast extra fancy only on the day Sister leaves, it would look like we’re happy she’s going back to the dorm.”

“Even so, you can’t hide how glad you are that I’m leaving.”

“……”

Rinka goes quiet, but she’s clearly been hit right where it hurts.

It’s not just Rinka—Ayuka and Fuzuha are happy too.
Even though Fuzuha was the one who called her back, now she wants her gone as soon as possible… I actually feel a little sorry for Satsuna.

It’s like that thing where the underclassmen act all respectful to their senior during club activities, but the second the senior leaves they flip her off behind her back.

In my case, it’s like desperately sucking up to my yandere DV girlfriend when she’s around, then badmouthing her like crazy online the moment she goes to work.
Of course it always ends with her finding out and giving me harsh punishment later.

“So, Sister, what time are you leaving?”

“I’ll head out after lunch. I still have some preparations, so I’ll go now.”

Once she finishes breakfast, Satsuna heads up to her room on the third floor.

“Finally she’s leaving. Now I can finally relax.”

Rinka says that the second Satsuna is gone.

“Wasn’t her stay way too long?”

“Don’t ask me. Knowing Sister, the dorm girls probably act like they adore her on the surface but actually find her annoying behind her back.
Maybe letting her do this long home stay was their way of saying ‘please just commute from home from now on.’”

She’s really laying it on thick.
Well, Rinka was the one who got looked down on the most, so I get why.

“I’m really sorry… I didn’t think Satsuna would stay this long…”

Fuzuha, the one who actually called her back, apologizes.

“Seriously. It’s your fault for calling Satsuna back that this summer break felt so uncomfortable.”

“Hey, don’t blame Fuzuha too much. The real reason was that you and I weren’t getting along.”

That’s right.
Fuzuha technically called Satsuna back under the noble cause of fixing the relationship between Rinka and Ayuka.

As for how those two are doing now…

“It got bad because of you, right? You treated me like a stranger—don’t tell me you forgot.”

“Of course not. Back then you really were nothing but a stranger to me.”

“Then don’t worry. To me you’re still nothing but a flat-chested super-strong freak.”

“…Ayuka, have you still not learned where the line is?”

“…How much of a complex do you have about your chest…”

Well, I’d say things have mostly improved.

They still fight like this, but it’s way better than that cold-war atmosphere from before.

…Maybe having Satsuna as a common enemy helped.
Oh, but the same could probably be said about Kirino.

“So, are we throwing a party tonight?”

“A party for what?”

“Obviously. A going-away party to celebrate that sneaky sister finally leaving the house.”

Whoa, Ayuka’s doing the classic small-fry move that always gets her beaten up by her senior later.
In my case it’d be getting found out by my yandere girlfriend, getting DV’d, then either tied up super tight or having my arms and legs chopped off.

“…Stop it. You never know when Sister might overhear.”

“What, you scared? Aww, guess we should upgrade you to flat-chested super-strong chicken girl.”

“…You’re the first person who’s ever insulted me straight to my face like this, Ayuka.”

Eh? Wait, does that mean—

“Fine. If you’re gonna go that far, it won’t be a full party, but let’s at least make some noise to celebrate Sister’s departure.”

“Huh? You planning to fight or something? This is why muscle-brains are…”

Wow, Rinka’s totally fired up now.

Can’t be helped. In times like this—

“Oh, a party? Sounds good. Since it’s a special occasion, how about we invite Kirino too and make it an orgy party?”

“…Huh?”

“Hey Kiyoto, that joke isn’t landing.”

Good, that shut both of them up.