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One really helpful trick is that you need to ease her into it. Give her butt a really good rub, pinch it, grab it, play with it a little. As if to say "there are some much more fun things we could be doing instead, but you didn't behave well, so I'm going to have to do this."
If you're being particularly mean, slip your hand between her legs, run it along her inner thigh, etc. then start slapping.
