【Fantasy Institute】A sexual month with a solid sister

The eleventh work of the Institute of Delusional Studies, spin-off of “The Firm Sister
This is a spinoff of the experimental series, “The Solid Younger Sister".
I’ve been working on this for a few years now, and I’m really excited about it.
This is the first time I’ve written a story about my sister, and I’m really looking forward to reading it.
In the original, the sister who spent the night with her brother is just a logical girl with knowledge.
However, at night, she gets lazy and sleeps with her brother, because she wants to be pampered.

You’ll have to take your time to get to know the “solid sister".

It’s not about the story, it’s about H!
It’s not a story, it’s a story. It’s not just a story, it’s a sex scene from the very beginning!
There are 9 sex scenes in this game!
There are 9 scenes, including masturbation, verbal abuse, hand jobs, nipple licking, blow jobs, continuous ejaculation, and more.
Each scene has enough time and rich content for you to enjoy.
However, I also included some everyday scenes to take a break from the story, but please don’t worry about that. ……

About customized folders
This is a collection of independent tracks for each of the “voices," “environmental sounds," and “sound effects" necessary for the work.
This is for those who do not meet our recommended volume ratio for voices and other sounds.

If you want to make your hand job sound a little louder…
If you have any questions, please do not hesitate to contact us.

For example, if you feel that the sound of insects in the “Environmental Sounds" track is too loud, you can turn down the volume of the “Environmental Sounds" track yourself, or turn up the volume of the “Environmental Sounds" track.
For example, if you feel that the insects in the “Environmental Sounds" track are too noisy, you can turn down the volume of the “Environmental Sounds" track yourself, or even remove it.
You can select the tracks you want to use to make your work more personal.

If you are particular about your voice drama, this is a great tool for you.

◆Sound effects with binaural microphone recording
Environmental sounds, footsteps, knocks on doors, and other sound effects, as well as hand jobs and masturbation sounds used in this movie, are available at
All sound effects are binaural recordings.
Please enjoy the SE by the binaural microphone which can enjoy the real feeling easily.

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Story

A younger sister who always makes fun of her older brother, but somehow seems to approve of him.
She always says, “I’m always saying that, brother," with an exasperated laugh.

Such a firm sister had the childish habit of wanting to sleep with her.
When it comes to bedtime, she turns into a sweetheart, which is a complete change from during the day.
I told her to sleep alone, but I couldn’t reject her, so we continued to sleep together.

When we were sleeping together, my sister rubbed her butt against me half-jokingly.

It’s a great way to make sure you’re getting the most out of your vacation.
It’s a great way to make sure you’re getting the most out of your time and money.

In the event that you have any questions regarding where and the best way to get in touch with us, please do not hesitate to contact us.
It’s a great way to get to know the people in your life.

Contents

Day 1 “The Two of Us as Usual"(51:37)
The younger sister does her homework in her brother’s room as usual.
I’m sure you’ve heard of it. This is the first time I’ve ever seen this movie.
Today’s bedtime conversation is more lively than usual.
I’ve noticed that our bodies are getting closer together.
I reacted to the feminine scent emanating from my sister’s body and the softness of her skin, and–
☆ H scene “watching masturbation for the first time

Day 2 “Two in bed" (28:51)
It’s hard to escape the pleasure once you’ve learned it, and it’s easy to ask to observe again.
With her cheek on my shoulder and breathing feverishly, my sister asked for a closer look.
Just far enough to rest her head on my thigh, she said.
☆ H scene “spit dripping

Day 5 “In the bed of expectation" (22:52)
Even if you tell yourself that you shouldn’t ask for it every time you sleep with her, the gem is honest.
No matter how much I deny it with my mouth, I’m trapped just by my sister rubbing me.

When I give up and honestly start jerking off, my sister gently puts her palm on my right hand.

☆ H scene “Helping

Day 6 “In the bed" (15:33)
The unusual and bizarre situation of ejaculating right in front of your sister’s eyes…
The act was done with a subtle sense of immorality: “I might be doing something a little naughty.

But I don’t think asking my sister to help me is a “maybe".
My sister said it was “for sexual gratification".
If it’s sexual lust, is it permissible to use another person’s hands, even if it’s …… your sister’s hands?

☆ H scene “verbal abuse

Day 8 “Two in Bed" (37:59)
When I returned to my room after taking a bath, my sister was already under the covers waiting for me.

“Shall I tell you a strange story as a lullaby? My sister said.

A cat and poisonous gas munching in a box.

The only way to tell a difficult story is to pretend to be asleep.
My sister’s hand slowly caresses my lower abdomen as she murmurs goodnight to me.
It gradually moves downward and finally unbuttons my pajamas.
☆ H scene “nipple torture

Day 9 “Just another day: the smell" (12:39)
The next morning after my sister squeezed me late into the night.
Morning conversation over a cup of tea made by my sister.
The subject of our conversation was “favorite smells".
She is apparently concerned about her own body odor and stares at me with a cute tilt of her head.
A dangerous invitation. But I can’t refuse it.
After all, he was a foolish brother who would easily listen to his sister’s request.

Day 10 “My First Smell" (29:17)
My sister comes to my room before I take a bath.
With a flutter of her eyes and a glance to the right and left, she says, “I want to smell it.
I’m sure it’s not about body odor.
My sister doesn’t want to smell behind my ears, or my neck, or my armpits.
The finger points to the …… crotch, which he has been exposing frequently lately.

☆H scene “My first ……

Day 15: “My brother is addicted to my sister’s mouth" (18:36)
After the incident before the bath, I asked my sister to help me ejaculate every day.
It’s more pleasurable than being observed or having it done by hand.
A quarrelsome sister, shown during the day.
My sister’s lips that I see when we talk or eat.
My sister’s face, which I see every day as a matter of course, beside her raised rage, her red, swollen glans covered by her lips.
An overwhelming sense of immorality that has never been experienced before.

The pleasure of ejaculating into my sister’s hot cavity as she sucked on me while I shuddered at the immorality of it all.

There was an irreplaceable feeling of happiness.

☆H scene “spoiled oral ejaculation

Day 17 “My Sister’s Room" (49:49)
After my sister became a junior high school student, I stopped going into her room.
It was because he felt reserved towards his sister, who had become a bit more feminine.

In my sister’s room, we decided to sleep together today.

What’s with the scent?
Even if you don’t want to smell it, it stimulates your nostrils intensely.
It stains the brain marrow obscenely.
So if you receive a sweet proposal from your sister at such a time, all you can do is nod.
☆ H scene “continuous ejaculation

Afterwards" (13:43)
My sister seems to be having some unusual problems.
All right, I’ll be a big brother and help my sister out here.

What’s that, “love advice"?
No, it’s, uh…

Extra: “My Brother’s Secret" (30:40)
☆ H scene “Jiggle with masturbation

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This is a 5 hour and 11 minute movie including all the extras.
This work has been written out as usual, and “H-Scene Recollection" is available.
You can customize it as you like. (Because of its large size).

Please note
When compressed, the file size is 162GB, but when decompressed, it becomes 422GB.
Please pay attention to the available space when downloading and decompressing.

Voices
Megumu Morino as the younger sister (Yui)

Cover illustration
Pokachu