I've always had a thing for water. I've been comfortable in water my entire life...in fact I prefer to be around water as much as possible. I don't mean water in the BDSM sense though. Just the though of sex in/near flowing water makes me shiver with excitement.
Other than that, I really have a fetish for tying someone down and blindfolding them and stuffing cotton in their ears so their sense of touch is heightened and doin all sorts of fun things to tease them. For some reason the though of dragging a cold blade across someones skin while their in a state like this really turns me on, and thats about as far as I'd ever go with knife play. maybe some nicks and scrapes but I don't know if I could bring myself to actually cut someone