What does a guy think when a girl hugs him?

wonderingaboutboys
Okay GUYS. So let's say a girl you don't know that well (she's pretty cute, nice, you've talked to her once or twice before) and she randomly leans in and gives you a hug. (I know this is awkward, I just want to know what would go through your minds, & would you hug back?)
What does a guy think when a girl hugs him?
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