Kumi Kanzaki is a 42-year-old mother whose son was being teased by friends about being uncircumcised, leaving him depressed. Worried, Kumi decided to check his penis by pulling down his son's underwear. Indeed, her son was uncircumcised—the foreskin immediately returned to its original position when retracted. As she repeatedly pulled it back, her son's penis gradually grew larger. Overwhelmed by its alluring scent, Kumi forgot she was his mother and began sucking it.