The kind older brother helps his younger sister who is exploring her body. Xiangling is a beautiful female student living in the city with her cousin. This cousin takes very good care of Xiangling, occasionally having intimate contact with her, which makes it quite seductive, because Xiangling's body scent is very fragrant and alluring. There are days he even secretly takes Tường Linh's underwear to masturbate. Xiangling is an excellent student, but his biology grades are quite low; knowing this, his cousin uses his own body to help Xiangling understand his body and all subjects related to Biology better. This guy is really smart.