Somehow I Ended up Dating the Perfect Female Classmate, but My Sister Found Out and They're Turning Into Yanderes - Chapter 48-49

Chapter 48: Uninvited Guest

“…I’m bored.”

As usual, I’m holed up in my room.

I was supposed to go to cram school today, but after what happened yesterday, there’s no way I can casually walk into a place with Kirino and Ayuka.

“//”

The feeling of that deep kiss with Ayuka still lingers.

That slick sensation of saliva and tongue…//

If Ayuka, Kirino, and I ran into each other today, Ayuka might try to rub Kirino’s face yesterday.

“Skipping is definitely the best move.”

But if you ask if I’m going to study alone, that’s not exactly true either.

Honestly, with my grades, I’m almost guaranteed to get a recommendation somewhere, so I don’t feel the need to study.

“Fuzuha and Rinka aren’t here either.”

Both Fuzuha and Rinka are at club activities today.

Rinka said she was going to take a break from club to reflect on herself, but with the Kanto tournament coming up, she probably can’t afford to skip anymore.

“I’ll grab a drink.”

I drag myself up and head downstairs.

“…”

The living room is empty.

Looking at it, I feel a surge of freedom.

It’s like that urge to go wild in an empty classroom after school.

“Alright!”

Unable to hold back, I strip off my shirt.

Man, I’m super skinny.

“Uryaaa—!”

I flop onto the sofa.

This is bad. Going wild in an empty living room feels way too good…

“Uoohoi!”

Now I let out a weird yell and lie on the dining table.

Doing things I’d never normally do blows off all my pent-up stress.

“…”

Wait, looking at this calmly, what am I doing?

Going wild alone in an empty living room.

“This feels kinda empty.”

Muttering to myself, I reach for my shirt.

“Hm?”

The intercom rings.

Every time I hear it, I think this intercom sounds as annoying as a phone’s default alarm.

Why’d they pick such a discordant sound?

Probably just a delivery, I think, and open the door without checking the monitor.

“Yeah, I got a stamp if you need it.”

“Oh, Kiyo… uh, why are you shirtless?”

Kirino is standing there, already inside the gate.

“K-Kirino!? Why are you here?”

“That’s my line, Kiyoto-kun. Why are you shirtless?”

“Huh, shirtless…?”

I realize it as she says it.

I picked up my shirt but didn’t put it on.

“Hey, is there someone else in the house besides your little sister?”

I can feel a cold aura coming from Kirino.

“N-No, my sisters are all at club activities today. I’m the only one home.”

“Then why aren’t you wearing a shirt?”

She probably thinks I’m in the middle of something with a cheating partner.

“It’s… well, it was hot, you know.”

“Hot… so you were sweating?”

Yeah, but she’s imagining a different kind of sweating.

“Just come inside for now.”

“Y-Yes, please…”

I need to let her see the house to prove I’m innocent.

But that suitcase she’s holding is making me nervous.

Something feels off…

I let Kirino into the entrance, and she immediately starts checking the shoes.

She even inspects the shoe rack thoroughly.

“Nothing suspicious here.”

If you’re trying to say that quietly, I can totally hear you.

From there, Kirino searches the house like a detective.

The corners of the hallway, the bathroom, the living room, the stairs, the second-floor hallway, every room on the second floor, the stairs to the third floor, and the eldest sister’s room.

I’m stuck waiting at the entrance the whole time.

Probably to stop me from hiding any evidence.

By the way, the eldest sister’s room is completely locked, and even we can’t get in, so Kirino apparently stood by the door listening for any sounds.

…Is that really necessary?

“I checked everything, and there’s no trace of any other girls besides your sisters.”

Kirino comes back downstairs.

I’ve been waiting in the hot entrance for so long that I’m actually sweating now.

“Sorry, Kiyoto-kun, for acting suspicious.”

“No, I was the one who went outside shirtless, so it’s my fault.”

I lead Kirino to the living room.

“Your house is really big. Your room could probably fit three people.”

“Thanks. Want something to drink?”

“I’ll take some tea.”

I pour green tea from the fridge into a spare glass and hand it to Kirino.

“Thanks, Kiyoto-kun.”

She drinks slowly from the glass.

Even the way she drinks feels classy.

“So, what’s up today?”

“Huh? Didn’t I tell you? I’m staying over at your place for the day.”

—

Chapter 49: Just the Two of Us in My Room

“Huh? Didn’t I tell you? I’m staying over at your place for the day.”

Did I ever agree to that?

If I did, that’s a major screw-up.

“Uh, so you’re staying over today?”

“Yep. That’s why I brought my clothes.”

So that suitcase that’s been bugging me is full of Kirino’s clothes…

Kirino’s clothes…//

No, now’s not the time to daydream.

“Uh, well, today…”

I’m in trouble. Big trouble!

The day after what happened with Ayuka, my girlfriend shows up to stay over. It’s like a classic dating sim showdown.

“Is something else going on?”

“Nope.”

“Then it’s settled!”

Damn, why can’t I lie and say I have plans?

“Well, your honest side is pretty cute, Kiyoto-kun,” her face seems to say, so I guess it’s fine.

“So, I’m staying in your room, right?”

At this point, that’s obvious.

“Let’s sleep in the same bed.”

“!//”

She whispers in my ear, and my whole body tenses up.

“Come on, let’s go to your room.”

She grabs my hand and leads me to my room.

I’m completely wrapped around her finger. It’s my house, but she’s totally in charge.

I wouldn’t mind if she took charge of my body too.

“Like I said, your room is really big.”

She flatters me again as we enter.

“But your house looked pretty big too, so your rooms are probably bigger than this, right?”

“Hm, it’s not fair to compare. My house is basically all my room.”

It’s like comparing characters from different anime universes in a strength debate—pointless.

“This is your closet, huh?”

As soon as we’re in, Kirino opens my closet.

“You don’t have many clothes.”

“Yeah, I’m not really into fashion.”

I’m not saying that to act tough. I genuinely don’t care about trends.

Even if I dressed trendy, Ayuka would probably make fun of me, and it costs money.

“But if you followed trends, you’d be even cooler… No, forget that. If you got any cooler or cuter, other girls would swarm you.”

That line felt a bit out of character, but I’ll pretend I didn’t hear it.

“Your TV is huge. Do you always play that game on it?”

“Yeah, I usually play games on this TV.”

“So, that day when Fuzuha interrupted our multiplayer session, she came into your room, huh?”

Kirino, why are you digging up the past?

“Speaking of, isn’t today a cram school day?”

I change the topic quickly, but I’m actually curious.

“I left as soon as I realized you weren’t there.”

“And came to my house…?”

“Yeah, I was worried, so I thought I’d check on you. Then I figured, why not make today the sleepover day?”

That’s a bold move…

“So… you didn’t run into Ayuka?”

“Ayuka? I saw her from the cram school window while watching for you. But since you weren’t with her, I left before we crossed paths.”

“Okay, good.”

My biggest fear was Ayuka and Kirino meeting at cram school, Ayuka bragging about yesterday to one-up her, and Kirino storming over to confront me. But from her reaction, Kirino seems clueless.

“Since we’re in the same room today, why don’t we play on the same screen instead of online?”

This brutal game supports local co-op with multiple controllers, not just online multiplayer.

“Let’s see, we beat the last boss, right?”

“Wait, Kiyoto-kun, there’s a cliff ahead.”

“Before the boss fight, let’s stock up on tons of items.”

“Kiyoto-kun, watch out!!!”

“Yes! Thanks to you, we beat the boss without taking damage.”

…Am I even needed?

Her god-tier skills make me feel useless, even in co-op.

Anyway, Kirino and I got hooked on the game.

At some point, I heard someone come home downstairs, but we were too into the game to care.

As a result—

“Big brother? You’re being loud. Are you playing that game and freaking out alone…?”

And just like that, Fuzuha barges in, catching me and Kirino gaming together in my room.