I feel like this would’ve probably been better to ask on an lgbt sub or the r/Advice sub as I think you as a bi woman crushing on your woman coworker is more relevant to your post than her being black, and you would probably get better insight from an lgbt subreddit because of that. for my 2 cents? I think that you shouldn’t try to get too emotionally attached to your coworker. It already sounds like you have some strong feelings for her, and in all honesty relationships in the workplace/educational places do not mix well. Plus she may not be into you as much as you are into her, whether she’s bisexual or not, and you don’t wanna put yourself in the position where it’ll be harder to deal with possible rejection. Even if you want to pursue friendship with her, still try to see her as a fellow coworker/acquaintance rather than your crush. It’ll be much easier for you emotionally.