Adrien was reading a book on pick-up lines when Marinette, as her Ladybug persona, was fighting an akuma. "Where's Cat Noir when you need him?!" she complained before turning to Adrien. "Hey kid, have you seen Cat Noir?"
"Not really, but I do have one thing to say," Adrien gave the girl a wink and answered, "You're so cute, its distracting."
This immediately gave Ladybug an idea. "Good thinking, civillian! I can use my cuteness to distract my enemies and buy enough time for Cat Noir to get here!"
So Ladybug went back to the fight and used her cuteness to distract him as Adrien laughed and became Cat Noir to join the fight.