Father and siblings who moved to a new house. Unlike before, when the house is small and the siblings are in the same room, the younger brother begins to be aware of the woman. Slurry sister's bare legs, flickering sister's pants, sister's masturbation that I have seen. My sister's body, which I didn't care about, fascinates my younger brother. And the younger brother who can't stand it is finally ... A week-long story of an older sister and younger brother becoming female and male.