I have a crush on a friend of a friend. What do I do?

So I have a crush on a guy who is at most 2 years older than me. We only see each other once a day at the end of the day for 9th period. I just met him this year and he's kinda caught my eye ever since we met. He's cool with my guy best friend and my guy best friend even knows that I like him, but the issue is that when it's just the 3 of us in class he's kind of quiet, but when the 2 other girls we normally hang out with in class are present, that's when I usually get to talk to him. The issue is that we're both super quiet and to ourselves and I really want to make the first move and tell him how I feel but I don't really know how/where to start.
(Just for context, we have 3D art 9th period.)
I have a crush on a friend of a friend. What do I do?
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