[Castle]

Challenge accepted.

give me... 2 months, max.

[Need a plot help!]

Since you want it to be post-war Harry Potter, your plot could stem from having prominent Slytherin/Gryffindor members working together to break down the intolerances that lead to the DL rising.

Another question would be if you want them to do a sort of return year to finish school, or are they meeting out in the wizarding world some years down the road?

I hope this helped!