Augment: A Child's Innocence

Few can resist the guile-less child's request...
You have proficiency in persuasion, or if already proficient, you have expertise, however; if you aren't being completely genuine, are being deceptive or duplicitous, the roll is at disadvantage. 

"But Mom, my dinner is all gone! Why can't I have dessert?" As Mom watches the dog prance out from under the table with broccoli in its teeth.