A father and siblings who moved to a new house. Unlike before, the house is small, and when the siblings share a room, the younger brother begins to be conscious of her sister as a woman. My sister's slender legs, my sister's pants that flicker, and my sister's masturbation that I've seen. Her older sister's body, which she didn't care about, seductively stimulates her younger brother. And my younger brother who couldn't stand it finally... A story of a week until an older sister and younger brother become female and male.
