As far as positions
Whatever works.
The one constant for me though is stretching. Any positions where the areas you will be tickling are stretched out, produce much much greater resullts.
A stretched out tummy, ribs, or side, is just prime for some awesome ticklin!!!!!!!!!!!
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I hear what you are saying, and although the words are there, I can only truly understand you, when I hear you laugh those words, and you will laugh, and you will laugh!!! Mwoooha ha ha ha haaaa!