Let me add some more detail. This coworker is married and I have zero intention of disrupting her marriage. I could NOT be more genuine about that. However, there are so many things about the way we interact, the stuff we have in common, and about her, that I cannot even begin to explain how much I would like to try having her in my life - in a non-romantic way. To this end, I would like to conceal my attraction and invite her into my life for a potential relationship of a different kind. I believe that attraction naturally wears off over time. Should that be true, we may be in the midst of developing a wonderful friendship or some kind of relationship (other than dating).

That, of course, means I need to guard myself. Advice welcome.

Edit: As far as gender's relevant, half the time people think I'm female or are unsure of my gender. It's embarrassing but relevant to societal gender roles/expectations. I think that could work to my advantage this time. (The out-of-control endocrine problem explains part of the sensitivity I've been having in other posts on here toward gender-related stuff. I hate this problem, but it might as well work for my benefit at least once!)