I don't really fantasize about being tickled too much at work tbh. However, I work part-time at a hospital doing security, and I fantasize about seeing a lot of these nurses and doctors get tickled. Many of the nurses and some of the doctors wear either crocs or some other type of slip-on shoe, and quite a few times I have been walking around and noticed a pretty nurse sitting at the desk with her shoes off under the desk, socked feet just sitting there.
My one co-worker one time thats real pretty and that I had a slight crush on took her shoe and sock off to show me her pedicure. At that present moment, I felt kind of awkward, but looking back on thr situation, I probably could have gotten away with a quick foot tickle.
Regardless, hospitals present a lot of situational opportunities for tickling. Though I won't lie, if you're a foot fetishist, you'll either love or hate hospitals. If you're looking for the world's ugliest pairs of feet they'll definitely be found in the hospital.