Is it fine to have a drink or coffee with a married guy who you're not romantically interested in?

Let me start off by saying, I have no interest in this guy at all, he is like a younger brother to me.

Do you guys think it would be ok to have a drink or coffee with this guy who is married in a friends only way? I only ask this as we both study engineering (he is in a different class than me so we don't see each other much in college).

The people in my class are all much older than me and we don't really talk at all, and I don't have any other friends who like to talk about engineering as obviously it's not really a common subject for girls as it is for guys so it's just nice to have a conversation with someone who understands.

And also, do you think he would even be willing to have a conversation and a drink / coffee with a girl even just as friends?

Is it fine to have a drink or coffee with a married guy who you're not romantically interested in?
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