Hmm? Has Yamashiro always been that petite?

She's quite bouncy, normally. This angle's really tricky. It's like she got downgraded from her usual size...

and she's smiling

Looking at post #2229872, we can see how her clothes can cover her up. But at post #2229877 and post #2423131, we can see how big she is. And her normal outfit shouldn't be able to hide her bust so easily at this angle.

That combined with the smile means one thing. This Yamashiro is clearly a spy.

You can hear a certain CVL rejoicing...