ウチの弟マジでデカイんだけど見にこない?

6月 14, 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: 実姉ビッチ制服ハーレム寝取り中出し

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 little brother is really big, don’t you come and see me?

I’m currently being seen by my sister and three girls, including my friends.

My sister is a modern female student who is sexually uninhibited.
It all started when my sister unexpectedly spotted a masturbation scene.

My sister apparently was much bigger than average, and she was so funny that she quickly spread it on social media.

Finally, a girls’ night out was held at our house, such as a “brother’s dick viewing party."

My personality is bulging out as I stare at three attractive older sisters, Chiaki, who has great figures, Nagisa has sexy dark skin, and Yukiko, who looks pure unlike the other two.

“Yes… big?!"

The older sisters are very excited by the cock that appears to be bigger than their boyfriend or sex friend.

“Let’s try bigger♪"

He started to get into the wrong mood… It was supposed to be a fun game at first, but he ended up making a new virginity!
Since then, my sister friends have become so addicted to their big dicks that they have come to visit for sex.

He’s already falling in love with me (the cock) and apparently no other man is satisfied.

Maybe with this big dick, that strong-willed sister could even be my only woman…!?

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This is a CG collection in which a big-dicked younger brother is made into a showdown at a girl’s girl’s night out, and her virginity is taken away from her in bad mood, and somehow she gets a sex friend with a meat-masturbation toy.

[Brother]
A male student is troubled by his huge cock and his small spine.

She gets aroused by her extremely nice body, and masturbates every day is essential.
What’s more, his dick is too big, so his hands aren’t enough and he’s a must-have for a masturbation toy.

One day, my favorite masturbation toy, which I couldn’t stand the heavy use, was torn…
Furthermore, unfortunately, my sister witnessed that moment…!?

[Chiaki]
Big sister.She is a modern, sexually uninhibited female student and has a wealth of experience in men.
He has an outstanding figure and is popular.He is currently dating a handsome boyfriend.
They are a group of three who are good friends with Nagisa and Yukiko, and are the leaders.

One day, he accidentally witnessed his younger brother’s big dick, and was amused and took a photo with his smartphone.It spreads quickly on social media.
He also summons his friends by saying, “My little brother is really big, don’t you come and see me?"

He thinks his younger brother is cute, but he treats him like a pet and doesn’t look at him as a man.
However, one day, his younger brother has gained confidence in his dick…!

“It’s not good if it’s big!"
Even though he says this, he gets choked with a huge cock and becomes his younger brother’s sex friend at home.

[Nagisa]
Chiaki’s playmate.Blonde tanned gal.A bitch who has sex like a playful thing.
He also has a boyfriend, but apparently he has multiple sex friends.

He was pushed and excited, saying, “Nothing is a big deal," as he was bigger than any other man he had ever seen.
He starts doing a “joking" role, but he can’t hold back and inserts his younger brother’s virginity.

However, for a moment I was able to relax.
She falls into big dick sex that seems to thrust up from her pussy to the top of her head.
He gets really into his younger brother’s dick and tries to come to his house all the time.

Her uterus is now in love with her, and she wants to abandon her boyfriend and sex friend and become a woman just by her younger brother.

[Yukiko]
He is one of the three of them, but unlike the two, he has a pure and innocent appearance.
In fact, he has had a man’s experience as a boyfriend, Ma-kun, who is currently in a lovey-dovey relationship.

However, she is worried that she has never had an orgasm from having sex with Ma-kun…
He says that he might be able to get a good fit if his younger brother’s size is his, and he ends up inserting the penis.

Once you experience an orgasm, you’ll get the hang of climax!
That’s what I thought, but as soon as it was inserted, my pussy was given a shot.

revealing her female true nature to a big cock that is more than twice her boyfriend’s,
While apologizing to her beloved lover, she learns the NTR orgasm being impregnated by another male.

Since then, I’ve become completely addicted to cheating sex…
In fact, she is the most suspenseful and perverted girl out of the three.

[Sakura-chan]
My younger brother’s girlfriend.Made of silicon.
He was a very famous man and was a great match for his younger brother, but he ended up having a sad farewell…

★This story is fiction,
It has nothing to do with real people, organizations, or cases.

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Production: Smoke Haku (Smoke Organ)
Planning and original idea: Chinjao Musume

○34 basic CGs
○300 main pieces including differences
○Includes “Illustrated version only"

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