https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_560033

[Synopsis]

Step -siblings Kurumi (younger sister) and Shinji (older brother) are living together for the first time in ten years.
They're step-siblings but they've always been close...
When they reunite after ten years, he finds out that Kurumi has grown into a gyaru (gal).
However, his step-sister Kurumi remains as intimate as she was when she was a child ...
Meanwhile, her older brother Shinji is still a virgin...
His virgin brother can't hide his excitement at the intense physical contact of his step-sister Kurumi, who has grown physically and become a naughty gyaru...
Their physical contact soon escalates and Kurumi sweetly invites him to lose his virginity to her...
The two cross the line between brother and sister...
And so, their relationship develops into one of sex-filled days...

[Character Profile]

[Step-sister]

Kurumi Takasaka (♀)
A busty gyaru high school girl with a keen interest in sex.
This cute, gyaru little sister has adored her older brother, Shinji, as a stepbrother since childhood and remains as attached to him as ever even after their first reunion in ten years.
Confident in her sexual prowess, she approaches him with sweet seduction when she realizes he's a virgin.
She steadily seduces him with her impressive technique.

[Step-brother]

Shinji Takasaka (♂) is Kurumi's step-brother and a virgin.
Living with Kurumi for the first time in ten years, he's half excited and half nervous.
His virgin sensor seems to be responding to Kurumi's fully developed body and intense physical contact.
As expected, he loses his virginity to his step-sister.

Sequel (Raw): https://e-hentai.org/g/3473995/600d4c52a8/

Base +28, KingLucas +6, bigscuba +8