So, since I'm in a Moira Young-Rebel Heart groove, I checked Fanfiction.net to see if there was any related fanfic.
There's Saba/DeMalo, which is to be expected. And a bizarre happier ending for Rebel Heart which is also to be expected, but which also brings Gracie-the-two-sentence-dead-child back to life, which was a bit surprising.
But then there's also one that's Saba/Lugh and Saba/Emmi.
The Winchester Boys would not approve: