Can understand why. As a boy with two older sisters, I also developed a fetish for nylon feet when one day I picked up my sisters worn stockings and sniffed the toe area. The smell immediately aroused me and have been hooked ever since.
I grew up in a female-dominated patchwork family and, from the very beginning, had to servilely perform foot service for my older stepsister. As shown in this video, she also forced me to smell her toes intensely to get used to her strong foot scent. In the process, I developed a very strong foot fetish, which I can now only indulge with professional foot dominatrixes