All fetishes revolve around what turns you on that is not "normal" sex. This could mean anything at all to do with feet. She licks them, pisses on them, tickles them, cleans them, lies under them.
Just tell the girls what you want. And not just one girl - several. Really quite simple - with one big catch: many promise it because it sounds like easy money - but that depends on what you want. Clearly you need someone who is submissive.
I strongly advise you go into precise detail- describe the meeting of your dreams - and do your research. Read all reviews carefully. I have had very few real disappointments as a result.
"Time spent on reconnaissance is seldom wasted"