Maybe this is just me, but I say massage therapist. I used to have professional massages a while back, and they tickled like crazy. Also, I think I posted on here about how I met a massage therapist named Candy once, and I asked her if any of her clients had told her that massage tickled them, and she said yes, that massage can tickle, depending on the ticklishness of the person being massaged. While reflexologists and podiatrists are great jobs for tickle fetishists, and would be my personal choice because I love to tickle feet, the reason I picked massage therapist is because the therapist gets to explore the whole body, and may come across other ticklish areas besides just feet. This is just my opinion.
Mitch