When talking about interpretting emotions it depends on how well you know the person. If they a "day-one negroid" then you could interpet all emotions. assuming your not fake. However if thy just sus negroid happiness would be the easiest. just look for a smile:) hope this helps!!! have a gr8 day.
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I would tell their parents (hopefully they are good parents), but I would tell them to act as if they figured it out by themselves, so my friend won't know that I told them and won't hate me.
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