So, as it seems to me that a lot of people open new threads to look for stories i thought i would try to create a centralised location for that sake.
I am also going to post the first search request myself:
I read an interesting story once where the mane 6 and our beloved musicians were teachers at a school in a humanized AU. I don't remember much but Rainbow Dash was tbe sports teacher and vinyl's best friend, and the last chapter i read (it was incomplete at the time) happened at a party at Rainbow's house with Vinyl and Octavia starting their friendship. Any help would be appreciated.

4739853
I know I read that fic, and its not in my favorites anywhere, so sadly it must have been deleted.

4740969 thanks. I still hope it turns up somwhere.

You could try searching the archive. Hopefully this helps.
https://www.fimfiction.net/user/Fimfarchive