A point of clarifaction first - He killed Cecelia's double not Pal's. But I think knowing each other in passing is fine! I like the idea of them realizing they both sketch and having a convo about that. But I like the idea of accidentally jumping into the deep end with the baths, too.

Let's go with baths to crack open that convo about the doubles and all. Things to note about Diluc in passing - ...what does she look for in people she sees around? Like, what about them does she focus on?