Before I Knew It, Things Had Gone Too Far While I Was Playing Around With My Big Sister - Chapter 1: Irreversible

Chapter 1: Irreversible

“Miha, shall we sleep together tonight too?”

“Uh, um…”

That’s how my big sister, Iwamoto Haruka, invites me to bed.

From the outside, people might think we sisters get along well. …It’s not like we don’t get along, in fact, we get along pretty well… but getting along too well is the problem.

The feelings my big sister directs at me aren’t the kind of love between sisters, but the kind of love for a romantic partner.

I know it’s all my fault. But I’m not a lesbian, and even before that, I don’t have those kinds of feelings for my big sister….

Of course, I love my big sister, but that’s as family, as a sister.

Really, if I hadn’t done that back then…

I still regret it. It was when I was 12 years old and my big sister was 14 years old.

Back then, we were just normal sisters… maybe a bit closer than most.

We were always together, bathed together, and slept together.

That day, I got into bed with my big sister as usual, planning to sleep. …But that day, because I had taken a nap, I couldn’t fall asleep right away.

But my big sister didn’t have that problem, so she fell asleep first. Since I was usually the one to fall asleep first, I wanted to see my big sister’s sleeping face.

Thinking that, I tried to get closer to her in bed. …At that moment, because it was dark, my hand accidentally touched my big sister’s private part down there.

If I had just stopped at touching, it would have been fine. …But instead, I got curious and couldn’t stop there.

I knew about my own private part, but I wondered what my big sister’s was like. …We bathed together, but I had never touched it or anything, I thought innocently.

“Big sister?”

Thinking that, I quietly checked if my big sister was awake.

There was no response. So, I slowly slipped my hand into her underwear and touched her.

I tried stroking it or slipping my fingers in just a little. …While doing that, my big sister suddenly let out a sound.

“Ah, mm…”

I quickly pulled my hand back and pretended to sleep.

…

No matter how much time passed, my big sister didn’t say anything, so I stopped pretending to sleep and looked at her with eyes adjusted to the dark. My big sister was asleep.

Thinking it was just my imagination, I did the same thing to her again.

“Mm…”

My big sister let out that sound again, but she didn’t wake up, so I continued.

I kept doing it for a while, and when I started to get bored… that’s when it happened.

My big sister’s body suddenly trembled, and her voice got rougher than before.

Seeing her like that, I thought it was fun.

From then on, I started doing the same thing to my big sister every day.

Not just at bedtime, but also when we bathed together. …I did it while saying I was washing her.

Looking back, my big sister was already 14 then. It wouldn’t be strange if she already knew about those things. …No, I think she knew. She indirectly told me to stop, but I didn’t. I enjoyed seeing my always-perfect big sister make sloppy sounds and tremble.

I kept doing it, and two years passed. By then, my big sister had stopped resisting.

Then, in health class, I realized that what I had been doing for two years was something naughty.

Naturally, as soon as I got home, I apologized to my big sister. I said I wouldn’t do it anymore.

But it was already too late.

“Miha, you’ll take responsibility, right?”

My big sister said that with a smile.