Retro copro stingray where an Asian fart and scab on a captive's face

Having tied the hands of the prisoner, young Asian women settle the man on his back and begin to sexually humiliate. Having put the guy in the mouth and on the face, the pranks begin to fart loudly and lingeringly. Having squeezed a considerable amount of shit on a man's face, students in uniform begin to giggle and tell various dirty sex stories.