Chat's got a New Tail (a miraculous one shot)

After patrol one night, LB ends up tying Chat's hair up into a ponytail. She can't help but realize how similar he looks with his now kempt hair until she realizes he reminds her of Adrien. This detail confuses her so much that she ends up mistaking her feelings towards Adrien for Chat. Who is the boy under that mask anyway? And why is he making her all flustered all of a sudden?