The tool of the sun

(Reference: https://static1.e621.net/data/81/41/81414221adaf5af12f16ccfa1dfa48e5.jpg )

Celestia was tied up inside a facility, tied down in chains by her legs, arms and wings, with a tube connected to her horn sucking her magic, as one of the most powerful beings from her world, the humans were sure to absorb as much of her magic as they could to power up their technology, especially because the pony world needed her and her sister to move the sun and the moon, and by absorving their magic they were able to repeat the spell through the use of artificial horns.

That kept her weak and docile, and besides that, they were making sure to keep her trained for the carnal service the higher-ups wanted to get from the ex-princess of the sun. They had put a couple of mechanical vibrators up her asshole and pussy that were constantly going inside and out of her holes through the whole process, she would be moaning out loud if it weren't because of her ball gag on her mouth, and to make her even more desperate, she was blindfolded so she couldn't even see her surroundings, so she has nothing to focus on but the forced stimulation.

After an unknown amount of time for Celestia, the process was stopped after they had absorbed enough magic from her for the day. She had no way to tell how long she was there, but it felt like an eternity. She was almost relieved it was over, but she knew what was coming next was likely going to be worse, as the machine let her go she ended up falling roughly on the ground as she wasn't being supported anymore, even if the chains weren't weighing her down she had a ring on her horn that made it impossible for her to cast magic, and her wings feathers were cut off so she couldn't fly away.

"Good morning dear ¨princess¨ Celestia" an arrogant voice was heard now, he put especial sarcasm on the princess part as she clearly wasn't one anymore, Celestia felt him unwrapping and removing her blindfold which allow her to see who it was even though she already knew based on the voice.

It was a tall, dark and muscular human man who liked to come ever so often to humiliate her and abuse her, he saw her as nothing but a trophy to show his dominance and the superiority of the human race. He was Ivan the great the leader of the human empire, and so he considered that the enslaved former leaders of inferior races should belong to him specifically each time they conquered a new world, he had plenty of former princesses and queens as his slaves but Celestia was his personal favorite.

"I've something special for you Celestia dear" he announced to her as he kept her face up to make him look at him.