When guy takes your stuff a lot...?

So this guy that I like constantly takes my stuff. Like he'll take my pencil or something when I'm standing right beside him, so I see him, and tell him to give it back and he like grins and hands it to me. Sometimes he just comes up to me and picks up a paper on my desk, looks at it, and takes it. But I always get it back. Except one time he turned it in for me. But yeah, he takes stuff from me then gives it back all the time.
When guy takes your stuff a lot...?
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