Design a stroker that's inside a small sex doll or partial sex doll that can balance on the user's lap or thighs.
Yeah, I know--it would be tough to make it light enough and hard to reach the controls and clean it.
Which makes me think of a different idea--because you're designing this to use with SLR scripts, you don't need it to have buttons for controlling it--you could design it so that it is controlled through your apps. You could make it charge wirelessly and then you would only need a power button on the outside. Or is this going to be like the handy and you use it plugged in?