As a reminder, be sure to properly give content warnings and put sensitive subjects behind proper spoiler tags. It's for the mental health of not just your comrades, but yourself as well.
Here is a screenshot of where to find the spoiler button.
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A barista giving you pretty much anything more than your order? That's not the worst sign in the world.
A simple, "Hey, I think you're pretty cool, you wanna hang out sometime?" will give you a pretty quick indication of how mutual the interest is.
Maybe deprioritize a coffee hangout, though :P