Why did my friend sneak a photo of me?

I was hanging out with some friends, and my female friend angled her phone to take a picture of me. I saw it on her phone screen but didn’t say anything. I was a bit confused and wasn’t sure what to say

We definitely flirt with each other a little bit, but I don’t understand why she’d take a picture without just asking me.

Why did my friend sneak a photo of me?
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