Alya may not be paying attention and honestly neither is Adrien, but he has more to pay attention with. He's long since incorporated Chat's senses in his day to day life so as he's walking back home from a visit to a library, he notices a very familiar scent.

Then a familiar voice. One he hasn't heard in months. Immediately he changes course and hurries towards her, not really taking in what she's said.

Instead a wide grin spreads across his face. "Alya!" He called and its about a two second warning before she's scooped up into a friendly, if overly affectionate, hug by a decidedly taller sunshine boy. Two yeard is a lot of time to grow.