Since my fetishes are at the mild, less extreme end of the spectrum, ( pee and feet), it is relatively easy for me to combine them.
For example, recently my partner and I were having a picnic in a secluded nature preserve here in Florida. After we washed down our sandwiches with a couple of cold beers I soon had to pee. Out of sight of passers-by I stood where she could see me, (adding some exhibitionism), and made sure she had a good look at my semi-erect cock as I peed. Soon after, she had to go, and (adding a little voyeurism), I made sure I got a good look. A little later, sitting facing each other on our folding chairs, at my urging, she took off her sandals, and propped her feet up on my knees so I could admire and play with her beautiful feet. This enjoyable session only ended when I tried to suck her toes. That she feels is not to be done in public.
I always remind her of the tabloid photos of Sarah Ferguson, then the Duchess of York, having her toes sucked by her then boy friend. She just gives me that look, and I go back to my outdoor fondling, which is acceptable. 😜 ,
Just re-read this post and decided to edit it, since I noticed that I'm not actually COMBINING two fetishes (unless exhibitionism and voyeurism count as fetishes. I'm not sure I want to venture into the distinction between kinks and fetishes).
Let's just leave it on the basis that as soon as I can arrange it, I will try to be fondling her feet, while she pees. " A man's reach should exceed his grasp.........." and all that. 😄