Light a Candle, Cast a Shadow

Runaway plot bunny from a prompt where Ahsoka keeps her promise, stays with Vader, and gets in on his plans to overthrow Palpatine...but does so at the price of turning darkish herself. Vader's been using the Force to heal his body, but he only dares do so much while Palpatine's still around. Force Voodoo works in mysterious ways.

CH 4 IS UP:From what she could tell, Anakin was equally furious, but even less in control of his rage. She wasn't sure what the extent of his grudge against Maul was, whether the two of them had developed some sort of ongoing rivalry or whether Anakin simply wanted to avenge his TIE fighter's honor, but she had the sneaking suspicion Anakin's brilliant strategy in his current mental state would pretty much boil town to "let's play chicken until somebody blows up."

(Note: This story takes place immediately after Twilight of the Apprentice and will eventually contain a fully consensual pairing between two adults who missed each other very much. Sure, they might be plotting out multiple murders while they shag, but that's just Dark Side pillow talk.)