I like how nice they look and how diverse they can be! Though it's also how much they are- easy to serve almost? It's not hard to imagine holding a foot all for myself and licking, rubbing, nuzzling, or doing whatever else I can do to show a person I care, all while they feel tickles and squirm or order me to keep going! It's such a rush to think of all these sensations meeting all from a love for feet!
I guess the roundness and the subtle details are what's nice about them. A lowly body part that no normal person thinks twice about, yet there's something intimate about them. They're usually hidden inside shoes and socks, so when they're bare, it's exciting.
Totally agree with that, plus their just cute hehehe