I'm a bit unusual- I prefer no bondage. I enjoy seeing a girl's natural reactions to try to hide their tickle spots/defend against the tickler. It's hard to tell whether they're genuinely ticklish if they're bound up. To me, a girl is only ticklish enough if she violently jerks away from tickling.
Clothing is a big part of it for me- guess it's a part of my tickling fetish. I like it when a girl is tickled through thin/tight clothing and sheer socks. It's also nice when they are first protected by a jacket or sweater, and the tickler then finds his/her way under the protection.
While I enjoy the above as a part of my fetish, it does make my sex life challenging, since I am so picky with regards to what turns me on.