"One, two, three!" The Emperor was still in full robes (you would think this would affect his mobility, you think he would be slow for his age, but both is wrong.) And he was holding a stick in his mouth, across from Vader. The leopard did not appreciate dumbing down for the lion- especially because Vader had required so little training, otherwise emotional, or dragging Vader farther to the Dark Side, or philosophical. Vader had needed a tug here and there, occasionally something to attach to, something to obsess and devote himself to-
Like Padme Amidala. Navi. Luke. Victorianpup. And the cubs the Emperor knew were coming, as he had foreseen.
"One, two, three!" They were sparring and practicing forms right now- Vader had accustomed to fighting with his hands, and now had to readjust to mouth-holding. The Emperor threw his paw, pushing Vader down and back with the Force, and coming to stand on the lion, stick at his throat. The leopard moved it with his telekinesis, still holding the stick at his throat. The lion was on his back, the floor of the cabin creaking under their weight.
"This body weakens you Vader. All these things... They are distractions." His claws dig into the lion's mane, tugging. "I had believed you to be able to see past these things. It is becoming more and more apparent that I could have possibly been wrong." The Emperor hissed, lowering his ugly and wrinkled face closer to Vader. "You rarely allowed yourself to think her name and now she is living in your cabin." Yellow eyes focused on his apprentice- always watching him, always questioning him.
"A sith lord does not hesitate to obtain what he wants. You hesitate to kill Navi." He tugged harder on the mane, then started kneading through it like a scratching post, watching as Vader withheld signs of pain. "You are constantly reminded by the ghosts of your past, Vader. Ghosts must be banished. Lingering on the past is weakness, Vader." The Emperor said, finally getting off the lion, and putting the sticks on the wall. "And this body has made you weak, and has served you no purpose, except for pleasure. I want to see you back in your old body before these cubs are born."
Vader was about to speak, but stopped and stared.
"You thought I would not foresee this? I am no fool, Vader. Now go."
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Vader nodded, and left the cabin, going outside, and laying down, licking new bruises on his front legs.