What does it mean when a girl sits on your lap? (High school environment)

Anonymous
So this girl and I hung out with a bunch of friends. We usually tease each other and stuff. One day, we were all at this yogurt shop. There were two tables with two chairs each, all of us took a chair except her and one of my other guy friends who sat someplace across the room. I had taken her backpack from her and wouldn't let her leave yet, and so she sat on my lap. What does this mean?

I really like her, and I want some opinions about this. Thanks!
Updates
+1 y
One thing I forgot to add, my friends had mentioned my ex to her before and she was with me when I said hi to my ex. She did not seem troubled and teased me a little about it instead.
Updates
+1 y
One thing to make clear...i have no intentions whatsoever in any sexual relationships...and I'm 100% sure that she doesn't either. Its just not our type. Would it mean anything else BESIDES sexual stuff.
What does it mean when a girl sits on your lap? (High school environment)
3 Opinion