Original subtitles

After my dad died,

my mom raised me on her own.

My mom remarried three months ago.

That man became my stepdad.

But that man also had a child.

And so, our new life as a family of four began.

Good morning, Mom.

Good morning. Listen, Ai.

Can you wake up, Yuki? He hasn't gotten up yet.

He'll be late for school.

Eeeh? He overslept today, too? I guess it can't be helped.

My new father's child was a boy who was one year younger than me.

Suddenly, I had a younger brother of almost the same age as me.

But honestly, it didn't feel real.

Yuki?

Yuki! It's time to get up.

Sleeping like that...

Yuki?

Really...

Hey, you're going to be late! Get up! Yuki!

Really... Hey!

Hurry and get up! Hey, it's time to get up!

Yuki!

Hurr-

I broke up with my boyfriend about a year ago...

It's been a while since I've seen a man's erection.

This...

It's hot...

Huh?

Sister?

What are you doing?

Nothing, I'm not doing anything.

H-Hurry and get up! You'll be late. Hurry and get up.

Get up right a way! You'll be late!

Sister...

Say, Yuki-kun.

Are you going to bed late every day?

Yeah. I've gotten hooked on a game recently.

Yuki.

If you can't wake up because you're tired, you shouldn't play games at all!

If you keep doing that, you're going to have trouble when you enter society.

I know that.

Honey, don't say things like that.

And Yuki, if you go to bed late every day it will be bad for your health, okay?

Yuki, are you listening?

I'm listening.

What happened earlier... Did Yuki catch on?

Honey...

This is a difficult time.

Don't be too lenient. You have to be strict with him.

I know that, but aren't you too strict with him?

That's...

I'm home!

S-sister!

What are you doing, Yuki?

Eh? No...

Why did you come into my room?

Ah... Ah, that's right!

I was going to ask you to help me study. But you weren't here...

Now you're back!

Yeah, that's right.

Ah... Well, then... Help me when you've changed your clothes.

I will come back later.

Bye!

He's so weird.

Huh?

He went through my underwear...

Until now, I never imagined that someone would try to take my underwear.

So, what is it you don't understand?

Here, here.

- This? - Yeah.

What is it you don't understand?

Ah! Then! This.

What do you mean by "then"?

Eh?

Say...

Yuki, you lied when you asked me to help you study, right?

Eh?!

Wh-why...?

Because... What were you doing in this room earlier?

Eh? Well... I was waiting for you...

You went through my underwear, didn't you?

Listen.

Even if we're not related by blood, we're siblings.

You can't do that.

But you...

Huh? What?

You, too... You touched my cock this morning, didn't you?

What was that about?!

Because you were doing something strange, I became aware of you as a woman.

W-what are you talking about? How could I have done that kind of thing?

No.

You kept touching my cock.

Hey.

Admit it.

Should I tell your mother about this?

Okay, okay. I'm sorry.

It was wrong of me.

I knew it!

I'll tell mom.

Why?! I admitted it so you wouldn't tell her.

Then... Let me touch your body, too.

That's only fair, right?

I'm interested in your body, too.

Eh?

But...

But...

Say... It's okay for me to touch you, isn't it?

No, that's impossible.

Then, I'll tell mother about how you touched my cock.

That's...

You can't...

Well, then, it's okay, isn't it?

I have the right to touch your body, don't I?

- That's... That's enough. - What?

That's it.

You touched me more, right?

I didn't touch it.

No. You touched it a lot.

Hey...

Wai-

No, stop it...

Then, shall I tell mother?

We're siblings. Stop it.

What about you? You kept touching my cock when I was sleeping.

You're a coward.

That's...

Amazing...

- Say... - Stop it.

Which one is cowardly?

You touched me when I was asleep.

Hey...

W-wait... Stop it, I apologized for it, you know!

I don't like that.

Even if you apologized, I won't forgive you.

I told you to stop...

Then, is it okay if I tell mom?

That's impossible...

Hey!

- Let me see more. - No, you can't.

Please stop...

Well, it's okay to stop.

Then...

- Take this off. - No!

Hey, take off your clothes.

No way!

Take them off.

I don't want to.

I can't, can't, can't, can't... Let's stop here.

You touched me directly.

That's not a problem, is it?

Yes, it's a problem.

Then, on top of my underwear.

No way!

I told you no!

Since I...

haven't touched you here...

If I can't do this...

- Stop! - It's only fair, right?

No!

Wait!

But... But we're siblings.

Let's stop doing this.

It makes no difference to me.

Even though I'm your brother, you touched my cock, didn't you?

I said no...

What was that?

What do you mean?

It's was an accident.

- An accident? - For some reason...

For some reason you touched your brother's cock.

Please stop...

No! Don't...

Sis, you're making weird noises.

I'm not.

You really have to stop doing that!

You touched me like this.

W-what is it? Please stop.

- You're the one who touched my cock, right? - Stop!

- No! - Then...

Is it okay if I tell mom?

- I'll tell her! - It's impossible.

That's enough! That's enough!

Is it okay if I tell?

You've touched me now. Stop it!

No!

- Impossible. Don't! Please don't! - Really?

No...

No... Stop... Stop...

- I want you to stop... - No, you don't.

Doesn't it feel good?

No, stop.

No!

It's impossible...

We, we can't...

I-It's impossible.

- You really... really... - Sister...

I want you to touch me.

Here...

Then...

Stop it.

That's enough...

More...

We can't do this. It's impossible.

Sis, I want to do more.

We can't...

Hey, just a little more.

That feels good, right?

It feels good, right?

But...

What are you doing?

Can I come in?

Y-y-yes. W-what is it?

Aren't you taking a bath?

Oh, is Yuki here?

Yes, Sister was helping me with my studies.

Eeeh?

Can I go take a bath first?

Ah, yeah...

- Then, I'm off. - Sure!

Take your time.

Eeeh! You're helping Yuki to study. Are you gradually becoming a big sister?

I... What am I doing?

At that time, I...

had gotten more excited than I'd thought.

After that morning, my relationship with Yuki gradually changed.

Yuki. What's going on?

What is it?

At this time, Dad and Mom are sleeping.

So?

So...

I want to continue doing what we did before.

Eeeh? No...

I don't want to.

What we did before wasn't...

You came on so strongly that I just went a long with you.

That's a lie. Because you got excited, didn't you?

I didn't!

Saying that again.

You touched my cock before.

That's...

Hey...

You got excited too, didn't you?

N-No...

That's a lie.

Wait...

Stop it.

See, I knew it.

You don't dislike it.

You want to do it, too, don't you?

No...

That's... we can't do it.

I can't hold back.

Your breasts...

I'll make you feel good.

Take this off.

Don't... Hey...

- What? - I said stop.

You don't hate it.

Let's kiss some more.

I can hear from your sounds that it makes you feel good.

Don't...

Don't...

This must feel really good. You're moaning a lot.

Don't...

I want to see this, okay?

Amazing...

It's embarrassing.

Sis's ass. It's amazing.

No. Please stop.

No, don't...

Hey, wait!

Wait!

- This is amazing. - No. Wait, Yuki.

Wait...

Just a little bit.

Remove your hand.

Ah, don't!

No, no!

You can't do that! Ah!

Licking me!

I knew it. You're excited, too.

Stop...

Stop... Please, no more!

Sister, I can't hold back.

Hey...

Impossible. You can't.

Hey...

No!

No.

We can't! I said no!

We're siblings! To do this... It's weird!

I can't stop just like that.

Hey. Let me do it.

Then... H-hand... I can use my hand.

Eeeh?

M-mouth. What about your mouth?

No, that's impossible. I-I can use my hand.

L-like this?

Feels good.

- It feels good? - Mmm...

Amazing.

It's all wet here. Something's coming out.

Keep going. It feels so good.

How surprising. This feels good.

Amazing.

- Does it feel good? - It feels good.

It's really hard.

Amazing.

- You've gotten so hard. - It feels really good.

Like this?

This feels good, doesn't it?

Amazing...

I'm going to come.

- Are you about to come? - Mmm...

Ah, I'm coming, coming, coming!

A-Amazing...

Somehow... a lot came out.

Hey, aren't you going to leave now?

Even though we weren't true siblings, we had done something we shouldn't do and I should have felt bad about it.

But instead, my bond to Yuki got stronger.

- Here. - Thank you.

Good morning, Yuki.

Good morning.

Good morning.

Good morning.

Yuki, you're still wearing your pajamas? Don't be lazy. You need to tidy up.

I now that.

Yuki, I have to leave in a little while.

Please hurry up and eat your breakfast.

Okay.

Welcome home.

I'm home.

Eh?! Didn't you go to school?

No. I didn't go because I feel drowsy.

Feeling drowsy...?

Listen. Mom is coming home late tonight. Let's continue from where we started last night.

I told you yesterday, remember. We're siblings. I told you we couldn't keep doing that.

What are you doing? Stop it!

Even though you refused to give me a blowjob, as soon as I touch you, you get excited.

That's not true. I told you to stop!

That's a lie.

You'll start to feel good soon.

Stop!

I told you to stop.

Really! Please stop it! No!

I can't hold back.

Hey...

I'm going to get angry.

No! Please stop.

I'm telling you to stop!

Stop it!

No.

Don't! No! No!

You really can't do that! No!

Please stop!

Wait! Hey! Don't!

Please don't lick me!

Stop. Please stop.

No! Stop!

Please stop.

I told you to stop.

We can't do this!

Please stop...

No, no... We can't! Stop!

Stop it... No more, please...

What?! What are you...?!

I'll make you feel good.

Keep rubbing it.

Sis, I can't hold back any longer.

It's impossible.

- Listen, I want to put it in. That's okay, right? - No.

No, we can't do that.

I... Please, I can't hold back.

We can't.

I want to put it in. Please...

- Impossible. No! Don't! - It's okay, isn't it?

Why? I can't hold back.

I told you, we're siblings.

Please!

No!

Stop it. Don't!

Ah, I'm coming, com-!

I'm coming! Coming!

Hey... It's okay, right?

No... No...

Really? Then I can just rub it against you.

Okay? Just rub it.

Would that be okay?

Mmm...

This is okay, isn't it?

You absolutely can't put it in.

- Don't put it in, okay? - Umm.

Does this feel good for you, Sis?

It feels good.

Amazing... You're rubbing it against me.

Feels good.

No, no, no! What?

Eh?! You can't put it in!

Sorry...

Just now... I didn't do it on purpose.

You can only rub it.

No! Hey, it's going in!

I told you not to do that! Okay?

Feels good.

Rubbing... rubbing...

Does it feel good for you when I rub it against you?

Yes... It feels good.

You're twitching.

Ah! It got inside... Stop...

- This is dangerous. - No, I...

I said no.

I told you not to put it in.

Rub...

Just rub it.

No...

Ah, no!

Ah! It's going inside!

I... I told you not to put it in!

I don't think I can go on like this.

I'll get on top.

Lie down.

It mustn't get inside, so I'll do it myself.

Rubbing, I'll do it this way.

You can't go in like this, right?

More.

Rub it against the top.

The top?

Like this?

Yeah, rub it there.

Rub it.

Feels good.

- Hey... - Keep moving...

Don't move your hips. It'll get inside.

I didn't move.

I'll just rub it against me.

Please, sis.

Hey, please, let me put the tip of my cock inside.

- Just the tip is okay. - Why?

No, I told you I wouldn't.

Please, it's all right with just the tip.

Just a little, okay?

Then... The tip. Only the tip, okay?

Yeah.

O-only the tip.

Only this far inside, okay?

Putting just the tip inside feels good.

I knew it. I can't do it, after all.

Eh?

Enough... That's enough, okay? This is impossible.

- Eh?! - Impossible!

Wait a minute!

Hey, I won't be able to come this way.

Hand, by hand. I'll do it with my hand.

Your hands aren't enough. Do it with your mouth. Your mouth.

Eeh? My mouth...?

Please.

All right, I'll do it with my mouth, then.

Don't tell me to put it inside again.

Hey...

Hurry up and come.

Ah, Sis...

I'm going to come! I'm coming, coming!

I'm coming!

Thank you.

I was about to go crazy, and I almost pushed it deep inside of me.

That was dangerous. The feeling was so intense...

But if Yuki demanded it, I wasn't sure I could refuse.

Eh?! Wh- What, what, what?!

Earlier, the tip went inside you, didn't it?

I knew it, more than the tip went inside.

It felt good when it went deeper inside, didn't it?

Hey, sis, don't ignore me.

I just felt sorry for you, so I listened to you.

But even if you say that...

What are you saying?!

You don't believe me, but you're the one who pushed it deeper.

That was...! My legs got tired... It was just a mistake.

After all, I can't stand holding back like that any longer.

You kept going on about wanting to put it inside, right?

I didn't say I wanted to put it in.

It's the same. You were feeling it, too.

I didn't feel it! I felt sorry for you, so I just went along with it.

Then, just go along with me some more.

Are you saying that I should put it inside?

That's right.

If you don't go along with me, I'm gonna tell mom.

What are you saying? Don't you think threatening your sister is bad?

That's right. I have a bad personality.

What will you do?

Oh... Okay! But...

you can't put the tip in deeper than 3cm.

Put the tip in deeper than 3cm?

Yes. If it's only 3 cm,

then it can't be called having sex.

All right.

Then, we've established the rules, right?

Also! If you intentionally put it in deeper,

I won't do it with you again. Okay?

Mmm...

What, what, what?

You did that before.

I want to do it again.

- Follow the rules properly. Wait! - I know.

Hey, wait, will you?

It's okay, isn't it?

You touched my cock many times, didn't you?

No, that's impossible.

I'm back!

I'm sorry for being late! I'll prepare a meal right away!

The halfway physical relationship between me and Yuki became an everyday occurrence.

But, to me, it felt like

it would be safe if he only put it in 3cm.

Say...

How is it for you, Ai-chan? Are you getting used to this new life?

Yes, I've gotten used to it.

I see.

It seems you're helping Yuki with his studies. Thank you.

I'm learning many things from my sister.

Many things?

Never mind.

Recently, it seems like I need to be close to Yuki.

Huh? Ai?

You haven't gone to school yet?

Ah? Well, I'm going now.

Where are you going, Mom?

Well, Kyoko is going to drive me to the new art museum today.

Bye!

I'll leave now. I'll be back in the evening.

Yes.

- I'm off! - Bye!

Sis!

Yuki, didn't you go to school earlier?

I waited for you, Sis.

You're not going to school...?

It's just the two of us now.

Eh? That's true...

Let's do it.

Someone might see us...

Sis... Sis...

Someone might see us...

That's enough.

No...

No...

Lick me there...

Eh! Wait! Don't lick me...

This is embarrassing...

That's...

Oh no!

Feels good...

No!

That's a problem.

I see. That's a problem.

Oh, me? I've gone back home.

Mom... Why did she come back?

The, I'll see you in a little while.

What do we do?

Okay, I'll be waiting.

Yeees~!

Eh? Sis?!

Shh!

Mom's right there.

Let's keep going.

Sis...

We shouldn't do this.

Eh? Wait...

Be quiet.

I want you to lick me.

Lick me.

Mom...

Thinking about getting caught by Mom is making me really excited.

You surprised me, Sis.

Yes? You're coming now?

Ah, I'll be right out. Just wait a little. Yes.

She went out.

Sis...

You really surprised me when you asked me to lick you while mom were here.

That was because... it got me excited.

I want to put it in.

- In...? - Inside. It's okay, isn't it?

Then, just the tip, okay?

Mmm.

Then, I'll lie down.

Absolutely no more than 3cm, okay?

The tip, only the tip, okay?

It went in...

It's going in...

Oh, no...

It's going in.

I-It... went in...

Ah, no!

It's going in. Oh no!

It's amazing.

You can't.

I said no more than 3cm!

You're deep inside me!

N-no...

I told you only 3cm.

Then, let me be on top this time.

Then, don't put all of it inside.

Understand? You definitely can't put it all inside me.

That's enough.

You can't push it deeper.

Ah, no!

No! No!

It's inside me!

That's too rough.

Ah, no!

Ah, no.

3cm! You can't put it in more than 3cm!

Sis, the deeper I put it in, the more pleasure you feel, right?

Ah, no, no, no, no!

Ah, don't!

Don't put it in any more...

No, no, no!

There... That's deep enough.

I'm coming! Coming, coming!

I'm coming! Coming, coming!

No more than 3 cm...

I told you...

I want to keep going.

Stop it. Just the tip...

No! Don't!

No!

I told you not to push it deep inside!

It feels good! Ah, I'm coming! Coming, coming!

No... No more.

- It feels so good. - No! Please stop!

You feel good when I push it deep inside, don't you, Sis?

No, no! No!

Ah, I'm coming, coming, coming!

Stop...

Aaah, I'm coming!

No, no, don't!

Ah, so deep!

So deep...

Feels so good.

Ah, no! Don't push it so deep!

Ah, I'm going to come!

Ah, I'm coming!

I told you not to push it deep...

After all, having proper sex feels really good, doesn't it?

You can't do that.

You broke the rules. I won't do it anymore.

But you got really excited!

There's a difference between those things. I won't do it anymore!

Eh?! Why?

Wai- Sis!

What's going on?

One week after that, my relationship with Yuki was gone.

Not only that, he wouldn't even talk to me.

During the February holidays, why don't we all take a trip together?

Yes, that would be nice.

Right!

Because we haven't traveled together yet, right?

Yuki, where do you want to go?

I don't care. Anywhere is okay with me.

Ai, you want to see the sea, don't you?

That's true...

Thank you for the food.

Ai, aren't you going to eat more?

I have no appetite for some reason.

I'm off!

Bye!

Bye.

Say, lately, Ai-chan doesn't seem to have much energy, does she?

Umm... That's true.

What is it? This sad feeling...

I can still feel the pleasure of being penetrated "there" by Yuki.

After all...

Doing it with my own hand isn't enough.

Eh? Sis, what's going on? It's late.

You know...

I've been thinking...

About the 3cm rule...

The strength of each other's feelings is important, right?

If you give in to pleasure, it's just normal sex.

I know and I regret doing that.

So...

If you keep the rules,

we can do it again.

Eh?

Really?

Sis...

Keep touching me.

That really...

Ah, that feels good.

Feels good.

Ah, that feels good!

My breasts...

Really...

That feels so good.

Amazing. I want more.

You're really...

Take them off.

Lick me there.

Make me feel good.

There... That's... Ah, feels so good!

It feels amazing!

More! Keep licking me like that!

Keep touching me.

Touch me without your hands.

That feels so good. Feels good!

It feels really good there.

Feels good. Feels so good there.

Ah, I'm coming, coming!

I'm coming! Coming, coming!

I'm about to come.

No, no, no, no! I'm coming, coming, coming!

Ah, I'm coming!

Hey, more... more...

Let's keep doing things that feel good.

Can I suck it?

I'll make you feel good.

Does it feel good?

It's so hard.

Does it feel good?

Does this feel good?

Ah, it's gotten really hard.

Say, when we didn't do it, did you masturbate alone?

Ah, that's amazing.

Doing it together feels much better than doing it alone, right?

Yeah, it feels really good, Sis.

Does it feel good?

Amazing.

- Can you lick me, too? - I want to lick you, Sis...

Amazing.

Together...

Ah, there!

It feels so good when you lick me there.

Here?

Right there.

Yes, there! Deep... Push it deep inside!

Feels good! Feels good.

Ah, so good!

Keep sucking.

Your finger. Push it deep inside me.

More... Deeper...

Ah, that feels so good.

Ah, yes! Push it deeper inside.

Ah, there's so much coming out.

So good, so good.

More, keep licking me!

More!

Ah, feels so good!

It feels so good like that.

More! Keep licking me! Make me come again.

Ah, I'm coming!

More, keep licking!

Ah, I'm coming!

Ah, so amazing. Really...

Let's keep going.

You're rubbing it so hard.

Amazing. It's all slippery, isn't it, Yuki?

Sis...

Say, should I put it in?

I want to put it in.

Just the tip?

That's right, just the tip

The tip... Just 3cm.

It's inside.

Does this feel good?

Y-yeah...

It's amazing.

Your cock... It's so hard.

Ah, it's so hard.

That feels good.

But, I can't hold back from pushing it in.

- Ah, like that! - I, Sis...

Feels amazing, right?

It went deep inside.

Hey, pushing it deep feels good!

I can't hold back! Deeper!

More! Push it in deeper! Deeper!

Ah! I'm coming, coming, coming!

Ah, amazing... Right? It's amazing...

- Your cock is deep inside of me. - It's going inside.

Ah, a-amazing...

Deep... It feels so good deep inside of me.

It feels good?

I said just the tip, but pushing it deep feels so good.

I'm pushing it inside.

That feels so good! Please push it even deeper!

That's amazing.

Ah, I'm coming!

It feels so good deep in side of me!

Ah, no!

Ah, I'm coming! Coming!

More...

- More? - Can I put it in again?

- Yeah. - Deep...

Say, pushing it deep inside feels really good, right?

Yes.

Amazing, amazing... Hey, it feels amazing.

You're pushing it all inside you.

- Inside Sis... - It's going in... It's going so deep inside.

It's amazing!

It's going so deep inside me!

Feels good. Doing it like this feels amazing!

Ah, no!

- Does it feel good? - Really good.

It's amazing.

Ah, I'm coming! Coming, coming, coming!

Ah, I'm coming!

Coming!

Amazing...

It feels so good. Deep feels good!

Keep pushing it deep inside!

Ah, feels good!

Your cock feels so good!

Ah, I'm coming! Coming, coming, coming, coming!

Ah, this is amazing, Sis...

So amazing...

Now let's do it like this, okay?

Push it in deep from behind.

Really...

It's going really deep.

Deep... It feels so good when it's deep.

Ah, I'm co... ming...

I'm coming!

Amazing! Feels so good!

Ah, like that!

It's pushing deep inside me.

Oh no!

It feels amazing. It's going in so deep!

Oh, no, no, no!

Ah, I'm coming, coming!

Coming, coming!

More! More!

More! It's amazing!

No, no more! I'm going to come!

It feels so good there!

It feels so good!!! Right there!

Ah, I'm coming, coming! Coming!

Ah, I'm coming

More...

I want more!

Feels so good!

So good, so good...

Ah, feels so good!

Ah, feels so good! Ah, no, no, no!!!

I'm coming! Coming!

Coming...

Not like that...

Amazing...

Ah, it's touching me deep inside. Feels so good.

Deep... It feels so good.

It's feels so go right there.

Ah, so deep!

Ah, I'm...!

I'm coming!

Ah, I'm coming again! Coming, coming, coming!

Ah, I'm coming!

- You can keep going. - Really?

It's inside... So deep inside me.

You're so hard.

Ah, feels so good deep inside!

More... More...

Ah, no, no, no, no!

I'm coming!

No! There...

It feels so good!

Yes, that feels good.

That feels so good! More, push it deeper inside!

Aaah! I'm coming! Coming, coming...

Feels so good.

More...

It's going deep. It's going really deep inside me!

Feels good!

Ah, I'm coming, coming, coming!

No more...

Not like that. It feels strange...

It feels so strange...

It feels so good. I think I'm going to come.

That feels good.

Feels good...

Amazing...

Ah, I'm coming, coming, coming!

Ah, feels good.

Ah, feels good.

Ah, feels good.

Amazing! Keep going like that!

Ah, I'm coming, coming, coming!

Ah, I'm coming!

Aaaah! I'm coming! I'm coming again!

Ah, I can't take any more!

That feels so good.

Aaah, feels so good!

Ah, I'm going to come!

Ah, feels... Feels so good.

It feels so good there.

I'm coming, coming!

Ah, I'm coming, coming, coming!

I'm coming! Ah, I'm coming!

Aaah, feels so good!

Ah, I'm coming!

Don't stop!

More! Keep going! Push it deeper!

- I'm coming. - Aaah, I'm coming! Coming, coming...

I'm coming!

Amazing... You shot so much...

Sis...

Ah, I'm coming, coming!

We've stopped talking about rules.

And we're still continuing this relationship.