Marinette

It turned out that the person knocking on the door was Chloe's least favorite person next to Ladybug, Marinette Dupain-Cheng.

"What are YOU doing here?" Chloe hissed as Marinette approached her.

"Well, your mother said you needed a new babysitter, so..."

Chloe gasped in horror. "You're not."

Marinette smiled. "I am!"

Before Chloe could scream, Marinette stuck a pacifier in Chloe's mouth and went to check her diaper.