Yui-san (pseudonym) is an office lady who wears black pantyhose and works in the sales promotion department of a sportswear company. Her charm lies in her beautiful chestnut long hair and clear, adorable voice. Aiming for the high prize of 1 million yen, she takes on the piston challenge using a fixed dildo. Each time the thick dildo thrusts deep into her vagina, slippery pussy juices gush out, and she becomes so aroused that she squirts dramatically with a loud splashing sound. The highlight is seeing this amateur OL, perfectly suited in black pantyhose, in her most erotic state.