Mistress Sidonia is using her hand built sendep restriction box, a cunning device that will hold any slave in place, the four sliding gates holding down various areas of the body, allowing them to be tormented at will. Sidonia inserts a big metal dildo into her slave's ass, tying it in before putting him in the sendep box. She then uses the electro box to zap his cock, balls and deep in his asshole. He is then locked inside with the lid placed over and the electrics continuing the intense stimulation.