The very first thing you do, is you turn off your life support. Then, you exhale. A long, slow, exhale. Letting the stale air rattle out of your lungs. The breath goes on, and on, and on. You draw on the force to sustain you as you let it all out. And then, your lungs empty, you laugh. A silent, breathless, laugh. The desert winds of the nightmare of Tatooine leaving your body. You're free. Absolutely free. Unburdened to anyone. If you so desired you could just... leave. You could leave the empire to it's fate, let it collapse, and go elsewhere.
But of course you can't do that. Padmé is dead. Somewhere, in Sidious' archives, and research, and holocrons, and artifacts is a way to bring her back. Somewhere, in the Imperial archives, locked away so you don't have to see it, is her body. Preserved.
You loved her. You still love her. And now you can dedicate as much time as you want to saving her. You don't have to content yourself with the morsels of knowledge that your master sparingly handed out to you. You can greedily drink deep of what of his knowledge remained. You don't care about the stability of his empire. You can burn a thousand planets, if that's what it takes to bring her back.
Almost as an afterthought, you flip your whining life support back on. Dozens of red lights flash on your control panel, only to wink out as they determine that all is well.
You stare down at the familiar body of your padawan. Struggling to breathe, her guts spilling out of her body, her eyes unfocused in delirium. For a moment you are on Mustafar. For a moment you see yourself, in Obiwan's shoes, standing over Ashoka as though she was you. The illusion passes nearly as fast as it arrives, but what comes with it is a wind of fear and rage.
What do to with her? She freed you from a great burden. Perhaps she deserves a reward? But the only reward you can think to give her is the freedom, the peace, of death.
It's the reward a Jedi would desire. But you are not a Jedi.
[][Ashoka]Teach her
You could take your padawan on once more as your Sith Apprentice. Teach her the power, the life, the strength in the force. The similarity between her broken body and your own. Snips is already familiar with you being her master. It would not be hard. Some illusions. Some drugs. At least at first, put her mind back to where it once was.
By the time reality dawned upon her, she'd be of no mindset to escape.
[][Ashoka]Use her
Your own cybernetics are weak. Grevious had far better ones. You need to improve them, and perhaps by improving them you could find a way to bring Padmé back. You would not want her locked in a shell like your own. Ashoka could serve as a testbed for your experiments to improve yourself.
[][Ashoka]Release her
It wouldn't take long. A simple strike with a lightsaber and you could finish this remnant of the Jedi order. A dead jedi is more useful than a living one, for propaganda purposes. Not that you care much for the Empire, that was always your master's dream. But it's a useful tool, even if it only ever will be a tool.
Your mind made up, you leave the room. It's time to announce the Emperor's death.