Maybe you could have arousal pins and wetness pins? Since poking a pin in something does generally cause it to leak, doesn't it?
Another idea I had was, what if putting a pin/nail in her mouth area made her feel like she was sucking something.
And, another total crackpot idea that I'm sure you'd never add but I'd love to see, if you could... I just want to add some more stuffing to that voodoo doll in the right places, y'know what I mean?