Plans going awry

Sakura was determined to write on Rin today to use her house for the ley line. She was definitely going to get Rin to acquiesce to this. Unfortunately, it seemed this wasn't going to be first thing in the morning, as it seemed she wasn't there when class was about to start. She did at least get a chance to write rewrite Shirou's ownership onto Ayako, who hadn't noticed it come off in the shower like she had.

Eventually, Rin walked in right before class was about to be called, and... did her sister get bigger? Sakura definitely took notice, in particular Rin's rear - it definitely seemed to be larger than her chair was now. Sakura cursed under her breath at her sister's tardiness; she had wanted to get this all set up as quickly as possible! But, her seat was a good distance away, and trying to get to her now would cause a commotion, she resigned herself to waiting till lunch.

Having waited till the lunch break, she followed Rin as she headed out of the class room, walking towards the stairwell. She'd had to hide behind a few pillars, but she watched her sister head down the stairwell. Taking some papers from her backpack, she could use it as an excuse to get in writing range of Rin.

As she started down the stairs, she could hear Rin talking to... herself?

"Look, we need to figure out how we're going to handle this." "But I'm a Goddess! there's no chance of a Servant appearing stronger than me." "Shut up about that at school! And there are Servants known for taking down gods! so shut about that stuff at school, someone could be listening!" "Hey, you brought us down here to talk about it." "Rrrrrrrrrgh~!"

Those both sounded like Rin, but - wait, she said Servant? And goddess!? What is going- Sakura's train of thought was cut off as she stumbled, falling down the last couple steps and dropping her papers.

"Sakura!" Rin ran over and looked over her sister, helping her off the ground. Are you okay?"

"Y-yeah..." Sakura says, groaning slightly, the fall having left her a bit sore. She began reaching for her papers, Rin helping gather them. "You didn't hear any of that, did you?" The Tohsaka heir says, her sister's timing seeming suspicious.

"Ummm...." Sakura had to think about that. Ultimately, she decided to...