This is a real fine line that is walked by many here in the community. It seems to me that if tickling includes any bondage, it by definition is something that the ticklee doesn't like, or what is the need for restraint? It does get down to a matter of degrees of dislike. Personally I know that my wife would prefer not to be tickled, but she lets me do it because she knows I want to. I do tie her up so I can actually tickle her as opposed to constantly having to wrestle her down.
Much is made of everyone being opposed to "nonconsensual" tickling, but if you tie somebody up and tickle them as they plead for you to stop, isn't that nonconsensual? This is all a much larger question than I'm sure the OP wanted to get into, but tickling any truly ticklish person beyond just sensuous tickling would put you in the "dislike/hate" realm. Wouldn't it?