Plagg loves Marinette, yes he would admit that out loud, just to see Adrien's face and Marinette's coos,scratches,pets and cheese.
He loves her very much, not because she gives him cheese if Adrien doesn't give him. She was much more than his temporary cheese giver.
"Hey Adrien"
"Yeah?"
"I love the princess"
"Sure- wait what?!" He stood up to glare at the kwami. "Oh sure, just because she gives you-"
"Aside from the cheese, she's really kind and ten times better than you." Plagg remarked.
Adrien stayed silent before giving Plagg a smile. For once Plagg was right.
"Yeah, she is"