my sister's diary, hoshina ai.

Her father and sister moved to their new home. Unlike before, the house is narrow and when the older brother and sister are in a room together, the younger brother begins to care for her sister. A slender sister's raw legs, a flicker older sister's pants, an old girl's masturbation that she has seen. My sister's body, which I didn't care about, stimulates my younger brother captivatingly. And my brother, who couldn't stand it, finally... A week-long story of my sister and brother becoming female and male.