help with an idea eh...

I’m dealing with a bit of an issue regarding one of my ideas… I want to figure out how to activate a circuit (for a spanking/fucking machine or TENS unit) when someone pauses the movement of a dildo in their mouth… similar to Gord’s suck/blow trainer, but without all the air tubing and such… maybe using electricity… The only thing that comes to mind is attaching a shake-light flashlight to the bottom… lol… any thoughts…