The new plan

Rin sat on a bench in a park. It was not a nice park but Rin doubted there was a nice park anywhere in Malfeas.

Her exalted Healing was repairing the injury from Sakura's spear. While she sat and healed she plotted.

Her demons were all keeping an eye on the area around them to guard Rin while she plotted.

Rin had figured out the two problems with her first assault; Sakura was a lot stronger than she used to be and she had an effectively impregnable base in the The Conventicle Malfeasant.

The first she reasoned could be overcome if she herself grew stronger in turn, the second was a more difficult issue.

The most simple idea would be to somehow call her out, but she was unlikely to fall for that. It would need to be something that Sakura couldn't ignore.

A challenge then? A test of some sort, with their lives on the line. Sakura wasn't prideful enough to fall for that on it's own.

She needed good enough bait for any trap, she herself would make the perfect bait based on what she knew of Sakura's current mental state.

Then a challenge that leaves a loophole that to Sakura would look like a chance to kill her. Something like...

Head maid brought Sakura the letter the following 'Day'. Sakura looked at the outside and saw it adressed to "Sakura Tohsaka, my foolish sister."

A spike of fury shot through her as she opened the letter "My sister, let us settle this with one conflict, we both gather what forces we can and we have them clash to decide a victor. Both of us are the kings of our sides. If you agree we will clash at the end of the month. I wish for you to see the light but if I can't then I must defeat you.

Signed Rin Tohsaka"

Sakura crumpled the paper and was about to throw it before she stopped as some of the wording settled in. She smoothed the paper and read it again.

A game of chess, with Rin as a king?

In chess, if the king was out of position. If Rin intended to cheat there might be an issue but she could solve that quickly.

"Where did you get this?" She asked her maid

She bowed and spoke "My lady, it was as I was returning some scrolls to the library. Your opponent seems to have taken over a tenement block a few miles from here."

Sakura closed her eyes before they flashed open "Let us go then, to make sure that she doesn't cheat."

Rin sat on a chair that was not a throne. A throne would have been comfortable. This chair dug into her back.

Taking over the tenement block was not easy. She and her demons had been forced to gang up on the leader of the gang that used to run it.

She had no sorcerous bindings she could apply in Malfeas so she had been forced to simply scare the rest of the gang into obeying her orders. They resisted her and that would need to be rectified before the battle.

The door to the not-a-throneroom was opened suddenly as Sakura and her maid entered.

Rin lounged in her uncomfortable seat and smiled "Sister, I didn't expect you so soon." A lie but she had no doubt that Sakura would have seen that.

Sakura glared up at her "I am here about the terms for our battle."

Rin sat back up before looking at her "Very well, what needs to be made clear?" She didn't know what Sakura was doing here but her coming at all meant that she had fallen for the trap.

Sakura looked her dead in the eyes "Our allowed actions, we must swear to follow specific rules."

Rin looked on as Sakura outlined the oath "We two may not participate in the battle ourselves, we must send all forces we each own to fight, we may not bother any demons of a circle higher than first circle."

Rin listened to the oaths, the last was the hardest to agree to as one of her plans had been to get a second circle demon to agree to help but it was enough, the first two helped her own plans in a way even if the second was tricky to work around.

"I agree" Rin spoke those words and Sakura raised her hand "I sanctify this oath in the name of the Yozi." There was a strange feeling as if a cloud covered the sun but after a moment it was gone. Sakura didn't say anything more, she just turned and left.

After she and her maid were long gone Rin leaned back on the chair before standing up when it poked somewhere sensitive.

She smiled as her bound demons entered the room before declairing "We have won."

Elsewhere, back in the mansion that belonged to her, Sakura smiled. She wove her personal magic around her sworn oath, Cocooning it in shadow. Having done so the oath was locked. While Rin would be punished if she broke the oath, Sakura was in no danger of the same. Sakura could now break all three oaths at her leisure.

She smiled as the head maid brought her a meal. She glanced out the window and spoke with a smile "I have won."

End of chapter

At first the letter was longer but I lost that when the page refreshed at an unexpected moment.

Regardless; The book never says if Fiends can avoid punishment from their own oaths but I believe that they probably would be able to do that.

Next few chapters will be going back to Shirou so I apologise if they are boring as I still don't have a solid Idea of what he will be doing. Probably he will just be fixing his marble.