Use some imagination...
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SIZE="3"]To the point of the original post, I think this topic has strayed a bit. He asked for something she could insert at work that would drive her crazy or get her wiggly. I LOVE doing this kind of stuff to my wife. You can't insert an 8" rabbit vibe at work, and obviously, wireless remote panties aren't something she can insert either. Both are fine, but I don't think this is what the boy is looking for.
As for things SHE can do herself at work and feel excited/humiliated/whatever, you have countless options. The old standard Ben-Wa balls can be carried in a purse and inserted on command, and these will fill her up and move around a bit when she walks. Bear in mind, all insertables at work will require very snug panties with an ample crotch to keep her from losing whatever's stuffed in there! As some have suggested, have her bring a larger butt plug and put it in her p#ssy, not her rump - get a silicone one, they never go bad and won't irritate her with prolonged "use." Try and find one that's heavy - the more weight she's conscious of, the more self-conscious she'll be. We live near New Orleans, so inserting a large string of plastic Mardi Gras beads can also be very interesting. She really likes having a long set of beads inside her and then I very slowly pull them out once she's home, letting each one pull upward across her clit as they leave.
Don't spring for the wireless undies, make HER do the work. Try this: have her put a plain old egg vibe w/cord and controller in her purse before she leaves home, along with a small roll of medical tape. At the appointed time, call her at work and tell her to go insert the plug/balls/beads/whatever, AND then she is to tape the bullet vibe onto her clitoris and stuff the controller into her panties and tape it in place as well. She has to wear it home like this to show you her work and she'll be very conscious of the tapework and be presumably humbled and nervous about doing this in the restroom at work and possible bulges under her clothes. You can ten tell her when and for how long to make it buzz, demanding to hear it over the phone by having her hold the receiver down to her crotch. If you can't hear it, then she gets punished that evening - win/win!
Another very simple thing I've had my wife do, especially on days when she's wearing dress slacks at the office, is to bring several pairs of her panties she's worn through the week out of the dirty clothes to work in her purse. On command, she has to roll one pair up and shove it into the panties she's wearing, which tends to make her look like she has a "package" if anyone's staring - makes her very uneasy. The ideal situation calls for three pair of panties - she inserts the other two in each cup of her bra, thus making her boobs bigger than when she arrived at work and causing her to worry about a "lumpy appearance.
There are no limits, use your imagination and have fun! [/SIZE]