I didn't see it at first, but Ayato is using his burst to create dramatic effect.

Hole18 said:

I didn't see it at first, but Ayato is using his burst to create dramatic effect.

Should be obvious enough.
It never rains in cities. Not in Mondstadt, nor in Liyue Harbor, Inazuma or Sumeru City, and certainly not in the Court of Fontaine.
Aside from the times Neuvilette saw a sad movie or something.

There’s something just so beautiful about how both girls look like they’re about shoot themselves. Chiori, like she’ll shoot Ayato first haha

slave2thedrago said:

There’s something just so beautiful about how both girls look like they’re about shoot themselves. Chiori, like she’ll shoot Ayato first haha

Their relationship reminds me of MaoMao and Jinshi from Apothecary Diaries. You just get the feeling he likes the way she looks at him like he's a bug, which is probably something of a comfort for him with everybody trying to kiss his ass.