Author's Note: To hold over my Star Wars fans until I get the movies and find some new inspiration, here's a little drabble. Not my best, but I hope you enjoy.
He's not sure who he's betraying. At first, the little part of him that is still undeniably Anakin feels as if it's Obi-Wan he's being unfaithful to, but then Vader, stronger in a way, takes over. He's betraying Sidious by thinking he's betraying Obi-Wan.
Their lightsabers clash again. Neither of them move as quickly as they did before, and Anakin—Vader, a part of his mind corrects—can't help but think of the last time they fought. He'd just lost himself to the darkness and believed—believes—that he did the right thing. But something about the anguish in Obi-Wan's eyes, the disbelief, killed a part of him then. He remembers it vividly. He could feel Obi-Wan's pain radiating within himself.
Vader moves quickly, eager to finish this as soon as possible before more bitter memories resurface. He hears a voice call, the young man that came to get the princess, he thinks, but he really doesn't care right now.
He finishes Obi-Wan without really paying attention to those last moments. He said something about power; should he have been listening? It wasn't as though he never really listened to his master—former master, now enemy; why was it so confusing?—but he remembers clearly how many times he was lectured because he didn't follow directions.
Memories are stirring. They can't be forced down. He assumes, probably quite correctly, that it is the time lapse between when he last saw him to now. Almost twenty years with no contact and a sliver of him wonders how he made it through without him. But he knows their relationship had changed. Choices were made, choices that could not be undone. He ignores the shout of anguished protest in the last human shred of his brain as he continues his duties.
But there is one thing he can't ignore.
He feels as though he just killed a part of himself.