It wouldn't work
They're incompatible actions
You don't tickle a dom while their dominating you to start with, it doesn't work like that
And secondly if your exerting force restraining someone you can't be tickled anyway
Thirdly it is a very rare person that is ticklish in their frickin pits, AND you're meant to burrow your face in, lick, and rub yourself against the pits DIDN'T YOU GO TO SCHOOL
And lastly,
tickle fags should all go die, WORST fetish