My younger sister Sakura is always clumsy and a child inside. But every day when I look at my sister's grown up body, I just think of strange things. One day, I fell in love with Sakura, who gave me a one-shot, tied me up, and punished me with a lewd punishment! I squirted with a restraint electric massager to my sister who said, "Stop big brother!" In addition, Sakura herself begs for punishment and cums incontinence with SEX!