Bijin shika: Ijikuri nuki chiryô(2008)

Natsumi, who is studying to become a dental hygienist, works as an assistant to Risa, a dentist who has just opened her own practice. Risa has a fetish for getting aroused and wet by the sight of patients in pain. One day, when Natsumi, who is late, rushes to the treatment room, she finds Risa thrusting her hips on top of a screaming patient...