Let us know how your plan unfolds.
I'll pull up a pic of a female getting her feet tickled. I will say to her "this is actually a fun, but very effective exercise." I'll sit on the back of her legs around the thigh/knee area, bend her legs up to me and tightly wrap one arm around them. I'll hand her my phone to see the pic. Depending upon how she reacts I'll either tease her with talking before I tickle her or get right into it lol. Probably won't tickle her long but I will want to get her good