the 'r' is for 'reverse'
so SFF is when the shared fanbase makes the normally strong person like crazy strong as fans for the loser ditched them for the winner
rSFF is when there's a shared fanbase but it's the normally weaker character that's siphoning off saves from the stronger one
I request affiliated many pipes.
Been a bad girl, I know I am. And I'm so hot, I need a fan. I don't want a boy, I need a man.