Baka na Imouto wo Rikou ni Suru no wa Ore no xx Dake na Ken ni Tsuite | バカな妹を利口にするのは俺の××だけな件について

A certain day, to the house of Protagonist of living alone, younger sister Hana came. It was Hana that told to give study, but begins to take off clothes slowly for some reason.

Younger sister is actually a favorite type as opposite sex. As a matter of course, protagonist excites to younger sister's nakedness.

[It is nude recently in the house. Because it is comfortable, try it together.]

Clothes are taken off by Hana, protagonist erecting genitals are seen. [Why do you grow big?] To the younger sister who hears it mysteriously, it cannot be said desiring the younger sister, (The milk to make the younger sister wise here is blocked.) Random is said from the mouth.

Then Hana believes the word, at once "I want to drink the milk of Onii-chan." it takes and genitals are grasped. Thus with Protagonist, foolish life with a cute younger sister started.