The older brother helps his younger sister practice oral skills before meeting her boyfriend. Xiangling is a beautiful student living with her cousin in the village. Her cousin takes very good care of Xiangling. Sometimes when he is near her, he also wants to have her because the scent of Xiangling is too fragrant and attractive. One day, he even stole Xiangling's underwear to masturbate. Xiangling is a good student, but his biology grades are very low, and since his cousin knows this, he used his body to help Xiangling understand more about his body and all subjects related to biology. This person is too smart, I don't know.