Guys, How do you tell a guy at work you're keen?

I always have a good conversation/banter with a guy at work.

We get along really well & we've hung out twice on our own. I've only been working there 3 months.

One was dinner & the other was drinks at a bar.

The one at the bar was two weeks ago.

I'm not sure if he likes me or not. He hasn't touched me on the arm or not even a kiss on the cheek.

Our whole office is having a big party next week. He's going.

I'm going to wait when we've had a few drinks.

If I came up to him & put my arm around his shoulder or waist, would you notice that's a sign or would you think that's just being friendly if you've had a bit to drink?

I don't want to put it near his ass, cause I don't want the workplace to know or embarrasse him.

How do I make a move to tell him I'm keen?

Thank you

Guys, How do you tell a guy at work you're keen?
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