Yes I have some CFNM (clothed female, nude male) clients who would LOVE it!
Me reading this thinking: what KNEE FETISH? I have cute knees? Oh it's not about that at all!
When you mentioned "Knee Fetish" I had the vision of a stereotypical Victorian gentleman on a cam site "If I tip you 10 tuppence would you be so gracious to lift up your petticoats and allow me to gaze upon your knees".