I became interested in why foot fetishes occur recently.
Basically, it's the same reason why breasts are considered sexual (they aren't); it's all about novelty. If we lived in a nudist colony, neither feet, nor breasts would be considered sexy.
Feet get covered by shoes, making them more novel.
Tribal cultures dont regarded breasts, or feet, as sexy.
Though it begs the question: if nudity became normalized, then what would be novel?
People would find personalities, voices, power dynamics, and fantasies more or less erotic than they are now (for most people).
She's got 'fuck me' eyes.