Ok...now...how many people are activily participating in your demo and what roles will they (yourself included) be assuming?
Is the audience invited to play as well?
Are you the primary submissive object of attention or not....can you squirt when you cum?
Do you like elctro play? Water sports? Shibari? etc?
One thing I had to do for a private play party as a demo was go through an extensive amount of in scene power play negotiation with my Dom at the time and choose between having to squat while on a leash over a litter box and piss with my hands cuffed behind my back or get tied down to a Y cross mounted at coffee table hieght ass up and recieve an enema.
As instructed prior by him I followed script and chose the litter box and then for part two got the enema anyway.
On another occassion I had to be tied in an arm binder facing up knees allmost to shoulders (bent in half like a shot gun) and ankles held wide on a wieght bench like table and then have a series of different sized anal beads sans string inserted up my bottom one at a time and then push each back out after it was in for a lil while into a cup (for which I was judged on distance etc much to the ammusment of the guests....all prior to having all my holes filled with a variety of items he had brought and some of the guests where invited to participate using the items though not alowed to touch me directly.
Your imajination is the limit...just be safe first and kinky second sugar. I wish you the best of luck.