A hole is drilled in a female student's bicycle saddle and filled with a large amount of aphrodisiac. Unaware, the pranked female student endures riding her bicycle, but the aphrodisiac takes effect directly on her vagina, making it impossible to resist saddle masturbation. Unable to hold back any longer, she urinates in public. In her hazy consciousness, she is led into a blind spot and, in a state of compliance, goes wild with pleasure.
