Girl: Hey.
Orphan: Hi.
Girl: Wanna be friends?
Orphan: Sure.
Girl: Ok, and go ask your parents if we can have a sleep over.
Okay, listen up, buttercup. You clearly missed the point of this joke. You, Emma, wrote this. That's embarrassing enough for anyone. This joke is funny because the girl asks an orphan to go ask their parents for permission for a sleepover. Since the kid is an orphan, that's impossible and the humor comes from the inappropriate request. You probably are a child or haven't developed enough brain cells to find it funny on your own.