Jason is trying to put Lucy to bed right now and she is a manic, giggling fool. This is the worst version of the Lucy Who Won't Sleep, because she's irresistible. You don't want her to go to bed — you want to take her out for a beer.
Jason just said, in his sternest voice, "That's it, Lucy, I am not going to argue with you anymore." She chuckled and said coyly, "Yes, you aaarrrre...."
I laughed so loud from the other room that Jason got mad and Lucy laughed too.