It's Magic

Stage magician invites volunteers on stage during his show. Obviously they are all attractive well endowed young women of a certain type. He uses them in various tricks but the finale involves them being put in a box and made to vanish. Whilst the volunteer is in the sealed cabinet she is sprayed with a gas that both paralyzes her and makes her highly suggestible.
The inside of the cabinet is in fact a high tech hypnosis chamber and whilst helpless the volunteer is hypnotized by a light and sound show and given certain instructions. The trick finishes and the volunteer emerges from backstage unable to remember what happened. She leaves with her friends who quiz her on the trick but she seem unwilling to answer, they surmise the the magician has paid her to keep quiet.
A few days later we return to the magic show and see that the volunteer is now dressed in a skimpy costume and is assisting the magician on stage. Later we see her naked and horny making love to the magician.
The inside of the cabinet is in fact a high tech hypnosis chamber and whilst helpless the volunteer is hypnotized by a light and sound show and given certain instructions. The trick finishes and the volunteer emerges from backstage unable to remember what happened. She leaves with her friends who quiz her on the trick but she seem unwilling to answer, they surmise the the magician has paid her to keep quiet.
A few days later we return to the magic show and see that the volunteer is now dressed in a skimpy costume and is assisting the magician on stage. Later we see her naked and horny making love to the magician.