Satsuki, the ideal older sister, kind, caring, and soothing…

Kae, a lively and tomboyish younger sister who's attached to her older brother and follows him everywhere… I was spending happy days surrounded by these two and my parents.

…However.

There was a secret that only I, among the family, didn't know. The ideal older sister, Satsuki, and the cute younger sister, Kae, were my father's remarried wife's children from a previous marriage… and not related to me by blood.

From the moment I learned this fact, their intense attempts to win me over became unstoppable! ?

The sisters wants to warp her brothers sexual preferences! And so, their sexual activities begin…