The story of a little Ravenclaw and a little spider.
It all started with a misdirected letter. Is it a magical pen pal or fate? A letter opened the door to a new world for little Peter (not you). Fortunately, the spider boy who suffered a change had at least one pen pal to talk to, and fortunately this friend did not dislike his talkativeness.
Note: The timeline is not clear and there are many private settings. Everything is explained in parallel worlds. There is a Harry Potter world setting but no plot. If you don't like it, don't criticize it. Just write it and it will be finished.
Involving the world: Harry Potter, Avengers
Concept: There are still gentle echoes in distant places