OC and Crush were in potions class when someone accidentally did a potion wrong. Which made it exploded! And now everyone has animal features of their patronus if they weren't already an animagus

Like this

This can be Golden trio era or Marauders Era

Since Charlotte or Draco dont have patronus they are ferrets! Ferret twins -w- having ferret ears and tails

Josie has snowy owl wings on her back

Dawn has hippogriff wings on her back