Dr. Sparky, the enigmatic dominatrix, welcomes her new subject, the innocent Sierra. Outfitted with a UV wand, she teases Sierra's curves, leaving electric trails on her skin. Sierra, bound and gagged, submits to the doctor's every command. She eagerly takes Dr. Sparky's throbbing cock into her mouth, the UV wand occasionally buzzing against her lips, adding a zing of sensation. Dr. Sparky's groans intensify as Sierra's head bobs, her tongue swirling expertly. The session reaches its climax with a devastating facial, leaving Sierra marked with her own sinful delight.