Girls, What does it mean when a girl puts her legs over your lap?

So I was chilling in class and we have assigned seats. I sit next to my friend, we have a good relationship and talk often. Out of nowhere near the end of class she turns and puts her legs on my lap, and started talking to me. I don't know what to think and I don't know what it means, if it means anything at all.

Girls, What does it mean when a girl puts her legs over your lap?
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