How to ask a shy guy out?

Let me preface with the fact that we are coworkers, but he's leaving at the end of the month.

I've got a crush on my coworker but he's very shy. We only have a limited daily interaction, different departments, but I'm kinda smitten. Since he's shy, but again so am I, curious the best route to ask him out. Don't tell to not date a co-worker, like I said, he's leaving at the end of the month.

How to ask a shy guy out?
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