Thomas Astruc confirmed Ladybug and Chat Noir's transformations don't wear off unless they use Lucky Charm/Cataclysm.

I understand having the Miraculouses(?)  start wearing off to add more of a problem in romance scenes, but make sure those scenes are after a Lucky Charm/Cataclysm.

It's the little things, guys.

(Also, shout-out to @knucklesfoxysans for spamming me with votes and comments! I legit thought Wattpad was broken or something, when I saw 28-freaking notifications! You're awesome!)