My Childhood Friend Who is My Girlfriend was Stolen by My Best Friend. From Now on, I'll Flirt with My Ex-Best Friend's Little Sister! - Chapter 2

An Alliance with My Best Friend’s Little Sister

“I’ll become your cheating partner, Senpai. Let’s teach those guys how painful it is to be cuckolded.”

Rinka-chan holds my hand tightly and says so.

It feels like as if the time has stopped. As time starts to flow again, I’m stunned by the absurdity of what she just said.

“W-What are you talking about? Being my cheating partner, that’s just…”

“Am I saying something weird?”

“Yes you are! Besides, there’s no benefit for you in doing something like that. There is no reason for you to play the role of my cheating partner.”

“That’s not true at all.”

She tilts her head and says so nonchalantly.

Cheating partner…even as students, there are certain risks involved.

If strange rumours spread, it could affect her school life.

Also, being the cheating partner of a guy she doesn’t even like wouldn’t be fun at all.

However, Rinka-chan doesn’t seem to think that way at all.

“Because…I like you, Senpai.”

Rinka-chan says so with a gentle smile on her face.

“…huh?”

“I like you, Toshiya Naeki-senpai”

“A-Are you being serious?”

“Yeah, I’m serious.”

I’m stunned by Rinka-chan’s out of the blue confession.

“You didn’t notice it at all do you, Senpai?”

“Well…I mean, you never showed any signs of it.”

It’s been over four years since I first met Rinka-chan, but I never noticed her feelings at all.

I only see her as my best friend’s little sister. Because of that, it takes my brain quite a while to process this fact.

“Well, I knew you like your childhood friend, Senpai. So I kept my feelings hidden, supressing them to make sure you won’t notice it. But that’s exactly why I can’t forgive your girlfriend or my brother. I know it’s none of my business as an outsider, but I just can’t stand seeing you get hurt like this, Senpai!”

She leans forward, bringing her face close to mine.

Seeing her face up close makes my cheeks flush. She is truly beautiful.

The stories about her being constantly scouted on Takeshita Street are clearly not an exaggeration.

I quickly avert my gaze.

“You say you can’t stand seeing me get hurt…but aren’t you the one who usually hurt me, Rinka-chan? You’re always giving me a hard time.”

“…t-that’s an exception!”

“What kind of logic is that? That’s totally unreasonable.”

“I just want Senpai to pay attention to me. Even if it’s just a little bit.”

She mutters so softly.

However, since it’s just the two of us inside my room, I can hear her words clearly.

Now I really can’t bring myself to look at Rinka-chan in the eyes.

This is the first time someone confessed their feelings to me.

A heavy silence falls between us.

After sitting quietly for a while, both looking down, Rinka-chan finally breaks the silence.

“A-Anyway, I’m going to be Senpai’s cheating partner. Let’s make them suffer the same pain you have suffered.”

“…y-yeah.”

I just go along with her words half-heartedly.

But of course, this plan is full of uncertainty. I can’t help but feel uneasy about it.

“But I wonder if it will really work.”

“What do you mean?”

“Even if she saw me cheating on her, I just can’t imagine her being upset about it.”

She is the one who cheated on me first.

Even if she saw me cheating on her with Rinka-chan, I don’t think she will get upset about it.

I don’t think it will really bother her.

“Don’t worry, Senpai. Your girlfriend does have feelings for you.”

“But she cheated on me.”

“Even so, no one wants to date someone they don’t like. Besides, she’s extremely possessive. So if she sees you getting close with another girl, or worse, if she catches you cheating on her with another girl, I don’t think she will be able to stand it.”

I never think my childhood friend is possessive at all.

Maybe there are some things that can only be seen from Rinka-chan’s perspective.

In any case, if I trust what Rinka-chan says, it looks like I’ll be able to get my revenge on my childhood friend.

“However, I won’t be able to get my revenge on my best friend with this.”

“Senpai, have you forgotten?”

“Eh?”

“My brother is completely obsessed with me!”

“Ah.”

That’s right.

He is ridiculously obsessed with his little sister to the point where it makes everyone around him cringe.

He’s an extreme Siscon.

Rinka-chan always seems exasperated by it, keeping her distance from him.

“In other words, just the thought of me having a boyfriend would be a critical blow to my brother.”

“I see.”

Rinka-chan tightens her grip on my hand.

“If you choose me as your cheating partner, you can get revenge on both of them at the same time. So, what do you say, Senpai?”

Rinka-chan says so with a devilish smile on her face.

Getting back at someone because they hurt you is a childish idea. They say revenge only begets more revenge.

The right thing for me to do here would be to swallow my pride and let it all end here.

But Rinka-chan who is by my side is empathizing with me.

She even sets the stage for me to get my revenge on them.

“If we’re really going to do this, let’s do it seriously, Rinka-chan.”

“Yes, Senpai.”

And so, my plan for revenge begins.