I dunno if anyone has done this before, but how about an A-Z game? Go from A to Z with a word to do with tickling, like body parts, companies, models, etc. If we get to Z, we can start going backwards.
T. Hmmm. What can I use for the letter T . . . .
Oh... I know . .
Tension... No... wait....
Ummm... Oh, ok. . . Timid.
No?... Ok ok ok... here's one . . . Tied up. Yeah, that's it. . .
No, eh? (Heavy sigh) Oh alright. . . . .