I have a huge crush on my TA, how do I make this happen?

I didn't want to pursue anything while I was still in his class because I didn't think it would be ethical. But today was the last day and I don't really know how to make this go further.

We're only like 3 years apart so it's not like I'm too young for him or anything.
I have a huge crush on my TA, how do I make this happen?
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