Discovering a new erogenous zone 'Pilum Muscle' in a woman's buttocks! [※What is the Pilum Muscle?…It is a muscle in the deepest part of the buttocks, closely connected with nerves. With special stimulation, it becomes the ultimate erogenous zone for women, surpassing the nipples and clitoris.] Wakana Nao, with her supreme body, challenges the development of the Pilum Muscle for the first time in AV history. Initially skeptical, as she receives a specialist's unique massage, a stain gradually forms between her legs! When the pleasure surpasses the limit, she trembles and spasms, climaxing uncontrollably, and thoroughly enjoying Pilum Sex! The mystery of the female buttocks revealed for the first time!
