妹とその友人がエロすぎて俺の股間がヤバイ / Imouto to Sono Yuujin ga Ero Sugite Ore no Kokan ga Yabai
#1. 黒髪ロングでぺたんこ胸なツンデレ妹『海羽♡』編 | Kurokami Long de Petanko Mune na Tsundere Imouto “Miu” Hen | The Flat Chested, Long Black Haired Little Sister, Miu Arc
Miu, a tsundere younger sister with long black hair and a flat chest.
Because of her dislike of studying, her math grades are plummeting!
His older brother, Kanata, is given the role of a private tutor by his mother in return for an increase in pocket money.
However, her younger sister, who is in the prime of puberty, refuses to be alone with her older brother.
After the two of them came together, the three of them decided to hold a study session together with her sister’s friend Riko!
Riko with brown hair and big breasts. She is super cute to boot.
Such Riko likes Haruta, who is good at teaching her.
With her devilish smile on her face, Riko always clings to Haruta’s body while she’s studying.
Her younger sister glares at her brother who is in a state of deredere.
All of a sudden, Haruta finds himself under pressure from both of them!?
A tsundere younger sister in the prime of puberty and a friend of a slightly gal-like busty younger sister.
Which one would you choose?