My guy friend gives me serious fuck me eyes every day (in public) but doesn't do anything else. How do I respond so he knows I'm into him?

Every single day, always in a crowded room, he gives me "the look", like if we were alone it would be go time. I want to say something so he knows I know what he's doing and kind of motivate him to make a real move. I love flirting with him and eye fucking but he's just being a tease and it's getting frustrating!

I feel like saying that if he keeps looking at me like that, something is going to happen. Or say that his look seems to be an invitation and I'm going to take him up on it, or he needs to at least but me dinner first if he's going to eye fuck me every day. We joke around a lot but those looks are serious! Any ideas?
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Yesterday, he's staring, smiling, saying nothing for a loooong time. I stare back until it's too uncomfortable and finally ask him what he's doing/thinking and he says "just looking", still smiling and staring? Why won't he do more than just look?
My guy friend gives me serious fuck me eyes every day (in public) but doesn't do anything else. How do I respond so he knows I'm into him?
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