If you're more comfortable asking her if she'd like a foot massage, then ask her that. If she lets you, then proceed to massage her feet and then after a while just playfully ask her if she is ticklish and give them a little tease.
That, I think, is the easiest way without straight up asking "hey, can I tickle your feet?" which, I think, is way too high on the awkward scale... but, whatever works, I suppose.
lucky. If you want to tickle her, first explore how open minded she is, then ask if shes into bondage and say you'll be "gentle". Go for a little tickling at first, see if she likes it, if so, continue.
I love long toes-wish I didn't have Aspberger's Syndrome so bad, and was able to go to high school and university/college so I could meet pretty girls like this! Incredibly beautiful feet!😎
Could you have her paint her toes next time you take a picture?