Hogwarts!

*You, a person, who will end up being a powerful wizard, but..Noone knows that just yet, you just on the train, you're finding a spot to sit, then as you're walking past one of the carts, you hear a voice, you turn, Harry Potter, Ron Weasley, Hermione Granger, inviting you to sit with them* *Harry waves you over* Hey! Come sit with us!