a couple things I've done that I've enjoyed.

-- Lay her on her back and put her in a ball tie, wrists to the ankles, knees tied together. Put the nipple clamps on and run a string from the camps to the ankles, tight enough to encourage her to keep her legs up to lessen the tension on the clamps. Lay the wand under her, so that if she rocks forward, it contacts her in the right places, but if she rocks back, it does not. Her nipples will scream. Her legs get tired and she will want the vibe to rock her world. If you want to make it tougher, tie her arms above her head, so she can't use them to hold her legs. Last time I did it, I had an anal dildo. After a while, I was just rocking like a mad woman, not even caring about the nipple pain -- well, I kinda got off on it -- and trying to drive the anal dildo in deeper.

-- same basic idea. Tie her spread-eagle. Hang the wand from above her on a string, so that she has to raise her hips and arch her back to reach it. She won't be able to keep that position, but will want to. Added challenge: Nipple clamps tied to a pulley or loop in the ceiling (for me, it was a keyring on a rope). attached to a crotch rope. Make it so taught that she can't handle laying flat for long. She will spend her time arching her back & raising her hips to reduce the nipple pain and get the vibe on her. But the vibe will swing away if she moves too much. And she can't hold that position for long. It is best if you can tie her knees apart to keep her from pulling her legs together. (for me, it was a pipe used as a spreader bar). I've done that under a rafter in my basement and it's such wonderful frustration.

-- tied over a stool, nipple clamps attached to a rung of the stool while you alternate between spanking her and flipping on her vibe. When she jumps/moves, the clamps will bite. But it's nearly impossible to stay still, especially if she is surprised by a hard spank, when she doesn't expect it. Trust me on that.