The guys who walked in the door were ...
Fred and Victoire

-You guys missed us? -

-Thanks for inviting us to the party ..- Victoire said annoyed

-You are supposed to be teachers-said Dominique making quotes

"Shut up, are we going to the past?" said Fred. At that moment you stared with a scared face

-Yes we have heard you but don't worry that we are not going to say anything ..-

-if you take us, if you don't take us, we will tell the whole school, said fred joking

-Okay but hurry- Rose said annoyed

-ah! What do we travel now? -

-Yes, there is no more time-
lucy molly roxanne rose hugo louis fred victoire

she put on the necklace and shook hands with Hugo, Hugo with Dominique, Dominique with Roxanne, Roxanne with Alus, Albus with Lily, Lily with James, James with Victoire, Victoire with Fred, Fred with Louis, Louis with Molly, Molly with Lucy and finally Lucy to Rose.

You were 11 people, too many to make a trip to the past suddenly, when you released you thought it hadn't worked but someone came out of the boys' room ...

-Hello? What are you doing here? -

-We were not going to sleep but we couldn't and we wanted to talk- Rose said without turning around, suddenly she turned around and saw a redhead similar to her father and a boy with lightning black hair and round glasses, she was left with her mouth open. they realized and said ...

-are you OK?-

-Yes Yes-

-well, good night I hope to get along-

-I hope so-

-It looks like a Weasley hahaha- said Ron whispering

-You're right- Harry said with a laugh

-well tomorrow at breakfast we will decide which class each one should go to, you and you (you pointed to fred and victoire) will go to the last year and you will say that you are of that age-

That said Rose went with the girls to the girls 'stairs and they went into a room that was empty and the boys did the same but in the boys' rooms