Maybe a "You promised you wouldn't laugh" Ladynoir. And Ladybug would share something a little embarassing to Chat. Just something cute.
“You promised you wouldn’t laugh,” Ladybug pouted, crossing her arms defensively.
Chat Noir held up a hand. “I’m sorry, my Lady, you’re right,” he chuckled, attempting to look chagrin and failing miserably. “I’m really not laughing at your confession. The way you said it was just too adorable.”
She stomped her foot in irritation. “It is dumb that I haven’t kissed anyone yet though! I don’t see what’s so adorable about that,” she huffed.
“It’s not dumb,” he grinned fondly, “but I do think you’re forgetting about a very special person you have indeed kissed.”
She rolled her eyes. “Fine, let me revise. I’ve never kissed anyone when it wasn’t a life or death situation.”
Chat Noir glanced around the rooftop. “Well, it isn’t a life or death situation now. How about a kiss?” He puckered his lips and leaned forward and Ladybug pushed him away with a finger on his nose.
“Not a chance, Kitty.”
“Rude. I’m just trying to be a good friend.” He tilted his head, studying her. “Wait, does it really bother you?”
Ladybug dropped down to sit on the ledge of the building, swinging her legs over the side. She shrugged with a soft sigh. “I don’t know. A little. My best friend makes out with her boyfriend a lot and it’s like there’s something in the water at school. Everyone is kissing everyone.”
“It has seemed like that,” Chat Noir frowned. He caught her expression and blanched. “I mean, I see a lot of people pairing off lately too.”
She nodded, satisfied enough with his answer for the moment. “I guess it just makes me wonder what’s wrong with me, you know? Why is no one kissing me?”
“To be fair, I literally just offered to kiss you,” he reminded her, sitting down.