A letter from my beloved brother saying "Help". What the older sister saw when she returned to her parents' house for the first time in seven years was the strange appearance of her mother-in-law who was pleased to sexually tease her younger brother. A younger brother who is made into a toy with a refracted propensity of his mother-in-law. My sister used her body to practice true sex education in order to protect her beloved younger brother and teach her true sex.