Flirting or just playful?

A guy I'm around all day constantly pinches/pokes/tickles my waist every time he walks past me. He tries to get me to scream or be surprised. He is also super playful with me, tries to twist my arm behind my back, etc. A few times while being playful he has grazed his hand across my butt and never apologizes or acknowledges it. Is he flirting with me or just being playful? I am playful back to him, and I think he knows I have a crush on him.

Flirting or just playful?
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