Someone on the anon meme prompted an evil genderbent 'verse. I've written more for this than I originally planned. Rather than posting it all here and saving it with tags, I'll just link to the fills I've posted on the meme.
Warning: This AU barely has a plot, and no satisfying conclusion.
Prompt--
On Blackened Wings they Rose (aka Prologue)
The One With the Broken Wing Birds of a Feather I Fight and Flight Introduction: Supergirl Birds of a Feather II