Foot "fetish"
The way you share your interest sounds wonderful. By the way, I'd only call it a "fetish" if you *can't* enjoy sex without foot-worship. How does a strong sexual preference (or fetish) develop? Dr. John Money leads the school of thought that we develop "lovemaps" or idiosyncratic erotic attachments at a very early age, typically in response to either 1) some sort of systematic comforting by a particular object, or 2) some sort of trauma in which an object has enormous erotic significance.
On the other hand, it also seems clear that people often acquire tastes for things serendipitously--experimenting with something seen in a film, getting turned on to something new by a trusted lover, etc. Unless your sexual preference for feet becomes a problem, let go of the search for a "cause" and just enjoy it.
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