ウチの弟マジでデカイんだけど見にこない?

11月 12, 2025

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価格1,100円

販売日:2018年07月19日
作者:
サークル名:チンジャオ娘。
シナリオ:
シリーズ:
年齢指定:
作品形式: 実姉ビッチ制服寝取りハーレム中出し

僕は今、姉とその友人たち女子3人にチ○コを見られている――

僕の姉は性に奔放な今どきの女子学生。
そんな姉に、不覚にもオナニー現場を目撃されてしまったのがことの始まりだ。

僕のソレは平均よりもだいぶ大きいらしく面白がった姉は速攻SNSで拡散。

ついには「弟のチ○コ鑑賞会」などという女子会が我が家で催される始末。

スタイル抜群の姉・千秋を筆頭に、褐色肌がエロい渚さん、他の2人と違って清純そうな雪子さんと、3人の魅力的なお姉さんたちに見つめられ僕のナニは大膨張。

「うそ…デカッ!?」

彼氏やセフレよりも大きいらしいチ○コにお姉さんたちは大興奮。

「もっと大きくしてみようよ♪」

などと悪ノリしはじめて…最初は遊びだったはずなのに、まさかの筆下ろしまで!?
それ以来、デカチンにドハマリしてセックス目的で通うようになった姉友たち。

もはや僕(のチ○コ)にメロメロで、他の男じゃ満足できないらしい。

ひょっとしてこのデカチンなら、あの強気な姉も僕だけのオンナにできちゃうんじゃないか…!?

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デカチンの弟くんがお姉ちゃんの女子会で見世物にされて、悪ノリで童貞を奪われ、なんやかんやで肉オナホもといセフレギャルをゲットしちゃうCG集です。

【弟くん】
デカすぎるチ○コと、小さめの背が悩みの男子学生。

ナイスバディすぎるお姉ちゃんにムラムラして毎日のオナニーが欠かせない。
しかもチ○コがデカすぎるため、手じゃ物足りずオナホが必須。

ある日、そのヘビーユーズに耐えきれなかった愛用オナホが破れてしまい…
さらに不運にも、その瞬間をお姉ちゃんに目撃されて――!?

【千秋(ちあき)】
お姉ちゃん。性に奔放な今どきの女子学生で男性経験豊富。
スタイル抜群でモテ体質。現在はイケメン彼氏と交際中。
渚・雪子とは仲良し3人組で、そのリーダー的存在。

ある日偶然、弟のデカチンを目撃し、面白がってスマホで撮影。速攻SNSで拡散。
さらに「ウチの弟マジでデカイんだけど見にこない?」と仲間を呼び出してしまう。

弟のことは可愛く思っているが、あくまでペットのような扱いで男としては見ていなかった。
しかしある日、自分のチ○コに自信をつけた弟に襲われて…!

「デカけりゃ良いってもんじゃないんだから!」
と言いながらもデカチンでコテンパンにされ、弟の家庭内セフレにされてしまう。

【渚(なぎさ)】
千秋の遊び仲間。金髪褐色ギャル。遊び感覚でセックスしちゃうビッチ。
彼氏もいるが、セフレも複数人いる模様。

これまでのどの男より大きいナニを前にして「大したことない」と強がりながらも大興奮。
“冗談”でスマタをはじめるが、我慢できずに挿入して弟くんの童貞を奪ってしまう。

しかし余裕ぶっていられたのも一瞬。
オマ○コから頭のてっぺんまで突き上げてくるようなデカチンセックスに陥落。
弟くんのチ○コにドハマリして、しょっちゅう家に通ってくるように。

もはや子宮がメロメロで、彼氏やセフレを捨てて弟くんだけの女になりたがる。

【雪子(ゆきこ)】
仲良し3人組のひとりだが、ふたりと違って清純でウブそうな容姿をしている。
実際、男性経験は現在ラブラブ交際中の彼氏「まーくん」一人だった。

しかし、まーくんとのエッチで絶頂できたことがないのを悩んでおり…
弟くんのサイズならイケるかも、と挿入をオネダリしてしまう。

一度でも絶頂を経験すればイくコツがつかめるはず!
という考えだったのだが…挿入された途端オマ○コが一発服従。

彼氏の倍以上あるデカチン相手にメスの本性をさらけ出して、
愛する恋人に謝罪しながら他のオスに種付けされるNTRアクメを覚えてしまう。

それ以来、すっかり浮気セックスにハマってしまい…
実はドMで、3人の中で一番のむっつりスケベな女の子。

【さくらちゃん】
弟くんの彼女。シリコン製。
とても名器で弟くんと相性抜群だったが、悲しい別れを迎えることに…

★この物語はフィクションであり、
実在の人物・団体・事件などには一切関係がありません。

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制作:煙ハク(発煙器官)
企画・原案:チンジャオ娘

○基本CG34枚
○差分込み本編300枚
○『イラストのみver』収録

My younger brother is really big, why don’t you come see him?

Right now, my sister and her three female friends are looking at my dick…

My older sister is a modern-day female student who is sexually uninhibited.
It all started when my older sister unexpectedly witnessed me masturbating.

My older sister was amused by the fact that my size was much larger than average, and quickly spread the word on social media.

In the end, a girls’ party called “My brother’s dick viewing party" was held at our house.

My body swelled as I was stared at by three attractive ladies: Chiaki, my older sister with outstanding style, Nagisa, who has sexy dark skin, and Yukiko, who seems innocent unlike the other two.

“Oh no… it’s huge!?"

The ladies are very excited about the penis which seems to be bigger than their boyfriend or sex friend.

“Let’s make it bigger♪"

I started to get into a bad mood… At first it was supposed to be just for fun, but I ended up writing a new book!?
Since then, my sister friends have become addicted to big dicks and started going there for sex.

It seems like he’s already addicted to me and can’t be satisfied with other men.

Maybe with this big dick, I can make that strong sister my only woman…!?

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This is a CG collection in which a younger brother with a big dick is made a spectacle at his older sister’s girls’ party, loses his virginity due to some evil tricks, and somehow ends up getting a sex partner with a meat masturbator.

[Little brother]
A male student who is worried about his too big dick and his small height.

I’m so horny with such a nice older sister that I have to masturbate every day.
Moreover, because his dick is so big, it’s not enough to use his hands and a masturbator is necessary.

One day, my favorite masturbator couldn’t withstand the heavy use and broke…
Even more unlucky, that moment was witnessed by my sister…!?

[Chiaki]
Sister.A modern female student who is sexually uninhibited and has a lot of experience with men.
Excellent style and popular constitution.She is currently dating a handsome boyfriend.
He is a close friend of Nagisa and Yukiko, and serves as their leader.

One day, I happened to see my younger brother’s big dick and was so amused that I took a picture of it with my smartphone.Spread quickly on SNS.
He then calls out to his friends, saying, “My brother is really big, do you want to come see it?"

Although he thinks his younger brother is cute, he treats him more like a pet and doesn’t see him as a man.
But one day, he was attacked by his younger brother who had gained confidence in his dick…!

“Just because it’s big doesn’t mean it’s good!”
Even though she says that, she gets fucked with a big dick and ends up being made into her younger brother’s sex friend at home.

[Nagisa]
Chiaki’s playmate.Blonde brown gal.A bitch who has sex for fun.
She has a boyfriend, but she also seems to have multiple sex friends.

In front of a man who is bigger than any man she has ever seen, she gets excited even though she says “It’s no big deal."
He starts having sex with her as a joke, but he can’t resist and ends up stealing his younger brother’s virginity.

However, it was only for a moment that I felt relaxed.
She falls into sex with a huge dick that seems to thrust up from her pussy to the top of her head.
I’m so obsessed with my younger brother’s dick that he comes to my house often.

Her womb is already melting and she wants to abandon her boyfriend and sex friend and become a woman just for her brother.

[Yukiko]
He is one of three close friends, but unlike the two of them, he has an innocent and naive appearance.
In fact, her only experience with men was with her boyfriend, Ma-kun, with whom she is currently in a lovey-dovey relationship.

However, I am worried that I have never been able to climax during sex with Ma-kun…
I started inserting myself thinking that if it was my younger brother’s size, I might be able to cum.

If you experience orgasm even once, you’ll know the trick!
That was the idea…but as soon as it was inserted, her pussy immediately obeyed.

Exposing the true nature of a female to a partner with a big dick that is more than twice that of her boyfriend,
While apologizing to her beloved lover, she remembers the NTR orgasm of being inseminated by another male.

Since then, I have become completely addicted to cheating sex…
Actually, she is a masochist and the most sullen and lewd girl among the three.

[Sakura-chan]
My brother’s girlfriend.Made of silicone.
He was a very famous instrument and had great compatibility with his younger brother, but we had to have a sad parting…

★This story is fiction,
There is no connection to any real person, organization, or incident.

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Production: Smoke Haku (smoke organ)
Planning/original idea: Chinjao Musume

○34 basic CGs
○300 sheets including differences
○ “Illustration only ver” included

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