What does it mean when a guy friend sits in your lap?

Anonymous
so my guy friend was standing by his desk in 1st hour and when the teacher walked out of the room he sat in my lap in front of our friends. he has always been kinda sexual with me and it has just increased every since we've met. i would never have thought he would sit in my lap. does he like me or just likes to flirt with me. not that sexual with other girls.
What does it mean when a guy friend sits in your lap?
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