In interesting introspective.
I do think you got both characterization right for the most part. I think that Ladybug would have at first enjoyed the lack of puns because she does find them annoying but the prolonged period without would worry her.
I have a question though, in this depiction, was stoic Chat Noir more efficient then his pungent regular self?
Something I would also find interesting is if you did a complementary story from Ladybug's point of view on what her thoughts were during the same time frame.
but Kudos overall

Arrggghhh my heart...
The angst is real people

love all of this

Uh... no! Bad Mayura, bad!
Aw, not the ears! Or the tail!
I like the wild style more, too, Ladybug. Both in looks and personality. Come back to us, Kitty!
I'm mentally shaking Chat Noir right now. Ladybug wants you to be goofy! Don't do this to us!
I love how Ladybug "angrily mothers" Chat. Awwww!
Cha-at. Ladybug needs to just hug him until he gets all his sadness out.
Hug. Now. He's so sad!
Ladybug on the warpath, yes! And now Chat is back to normal-ish and maybe now they'll be closer than ever!
So. Cute. Sad, but cute!