Thin Ice by @rrainydaydreams is a WONDERFUL angsty fic involving our drowned rat Twilight(affectionate hehe). It honestly has some great tips on how to survive falling through ice!
Alone Together au! Where both Ford and Fiddleford fall through the portal
30 years after + first fall through
They fell through the portal after Fidd left Ford and before Stan arrives, that middle period where Ford is haunted by bill and going crazy.
Fiddleford went back after the incident trying one last time to warn Ford but instead they got into a fight actives the portal get sucked in and you know the rest.