My Beautiful Girlfriend Cheated on Me, so I found Comfort in Having a Relationship with Her Little Sister - Chapter 1

Cuckold

“Ahnnn—”

I can hear Shirahara Mana’s moaning voices from the other side of the wall.

I still can hear it even if I cover my ears.

Tears starts to run down my cheek.

This is really painful, I can’t describe my feelings with words. All I can feel right now is despair.

Seeing my reaction, Shirahara Yume hugs me gently and said,

“Ahh, you poor senpai. How much of a pervert you are to get an erection in a situation like this♡ Come on, let’s take care of that, you can do it with me, senpai. You can do whatever you want to me♡”

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I, Koichi Kuromiya, have a girlfriend named Mana Shirahara who I have been dating since middle school.

Mana is such a beautiful girl that it isn’t exaggeration that the boys in our school says she is the cutest girl in our grade. I don’t even understand how I’m able to be in a relationship with her.

“Koichi-kun.”

Right now, Mana and I are walking home together while holding each other’s hands.

“Hmm, what’s wrong?”

“I have something to take care of, so I’ll get going first now…”

“Ah, I see. Okay then.”

I was actually planning to go somewhere with Mana before we go home, but if she has something to take care of, then there’s no helping it.

Mana let go of my hand and starts to walk away.

After she walks a few steps ahead of me, she turns back and smiles at me.

“Well then, see you tomorrow.”

“Yeah… See you.”

Hah~ Really, how did I manage to date such a cute girl?

I feel a little sorry, I don’t think I deserve to be her boyfriend.

After all, Mana is someone who has been confessed to both at school and in her private life many times.

But, in the end, Mana chose me.

Not anyone else, but me.

Because Mana has something to take care of, I’ll just go straight home then.

After walking for a while, I finally arrive home.

As I just about to lie down on my bed, I suddenly receive a message on my phone.

It’s from Mana’s little sister. She is a first-year student who goes to the same school as me and Mana.

‘Senpai, can you come to my house for a bit? There is something I want to show you.’

She sent me the message along with a cute rabbit sticker.

‘Okay, I’m on my way.’

I replied so, get ready, and immediately leave my house.

Well, it’s quite boring to be home alone and I have nothing to do. So I’m feeling kind of excited.

After a while, I arrive at Mana’s house. As I’m about to press the intercom, Yume suddenly opens the door. It’s as if she is waiting for me.

Then Yume told me to be quiet by gesturing her index on her lips.

I wonder why I should be quiet? Well anyway, I should just listen to what she said.

“Please be quiet, senpai.”

Ah, the Shirahara sisters are really cute after all. Both Mana and Yume are really beautiful.

However, it’s hard to tell what they are thinking sometimes.

Yume nods her head.

Why does Yume seem a bit happy? Or is it just my imagination perhaps?

When I enter the living room, I can hear noises from the second floor.

Creaking noises echoes throughout the room.

Hmm? What is this noise?

Seeing my reaction,

“Are you curious about that noise, senpai?”

“Ah, yeah…”

“Actually, Nee-san thinks I’m not home yet because I told her I’m going to take a detour somewhere before going home. Well, actually, it was a lie ♪”

“Eh, what are you talking about…?”

I don’t understand, are you saying that Mana is the one who is making these creaking noises upstairs?

“Well, you’ll know when you see it for yourself. Come on, let’s go upstairs, senpai ♡”

Yume has a smug smile on her face as she said so.

What in the world is going on?

What the hell is that noise?

As I climb up the stairs, the noise becomes louder.

“Ahnnnn—”

I can hear a girl’s moan.

“Wait, wait, wait…could it be that Mana is doing it alone—”

As I’m imagining it, my face turns bright red.

“I’m sorry, but it’s a bit different from what you think senpai♡ She is doing it…with another guy.”

“Eh?”

I’m at a loss for words.

We walk towards Yume’s room.

…what does she mean? She is doing it with another guy?

Yume turns the doorknob and opens the door.

“What’s the matter senpai? Please, come on in♡”

“Ahnn…hmphhh…”

The moaning continues.

“Come on…come inside, senpai.”

Yume said so while grabbing my hand and pulls me to her room.

“Nhnnn…”

I can hear Mana moaning on the other side of the wall.

“The other side of this wall is Nee-san’s room.”

“Wait, wait, wait…I don’t understand what’s going on. Eh, Mana—”

Yume puts her hand around me and whispers to my ear.

“That’s right, Nee-san is having sex with a handsome guy right now, senpai.”

Today, I found out that my girlfriend cuckolded me.