Flower and Snake: White Uniform Rope Slave (1986)

An office worker attending an arts and crafts school ends up having lesbian sex with her instructor. When a toothache strikes mid-class one day, her instructor introduces a dentist to her. The dentist runs a clinic with one nurse. Her appointment is changed to an evening one when she wants to return for a second appointment. Upon arriving she lies down on the dentist's chair, is put to sleep and tied up naked. The dentist and assistant begin to admire her body and have sex. She is a willing victim soon.