Fimfiction.net spanking groups:

Spankfics - Founded by Pizzema Forte:
https://www.fimfiction.net/group/202904/spankfics
 
My Little Fetish (nsfw) - Founded by Officer Hotpants
https://www.fimfiction.net/group/1937/folder/68935/spanking

Spanking - Founded by PromKing2010
https://www.fimfiction.net/group/211675/spanking

MLP Diaper & Spanking (nsfw) - Founded by TankCop
https://www.fimfiction.net/group/213925/mlp-diaper-spanking

Other: 
https://archiveofourown.org/
https://www.fanfiction.net/
https://www.furaffinity.net/
https://inkbunny.net/
https://www.sofurry.com/

For any broken pastebin or fimfiction links use these:
https://poneb.in/
https://fimfetch.net/