Two sisters who have become a brother and sister, and their brother-in-law, Yufuyu, have a naughty appeal whether they are asleep or awake. Adolescent Yufuyu is unable to take a step forward, but there's no way he can withstand Ayaka and Haruka's impatient appeal...? Forbidden first sex with two older sisters! The sisters battle for the younger brother's cock never ends...!