A younger brother who is in the hospital asks the nurse's older sister to teach him how to have sex in order to get rid of his virginity. My older sister agrees, even though she is confused because she has sympathy for her younger brother. However, while she was touching her breasts, she gradually got aroused. She doesn't refuse strongly and wets her panties. And her younger brother Ji Po, who can no longer stand her, is inserted into her older sister Ma Ko.
