Yeah, not like s&m, feet or high heels. I mean unseen stuff. Also, not the "weird ones" like... well u know.
I like tongues. There used to be a good couple websites focused on the female tongue. The bigger the better. There was always a secret enjoyment whenever i was like, speaking to a girl, and naively she stuck her tongue out. Of course i hide the reaction, but i cant help imagining that tongue in another context, u know.
So, i found these websites and made myself a good colection of big images of girls tongues. Some of them from flickr, some others are just porn.
An example here.

So yeah, tell us ur cool fetishes.