Olivia's smirking to herself because as predictable as he is, she knows what this is going to do to him. They're either going to end up having phone sex or he's going to come over. And she can't say she's opposed to either one after the bad day she's had.

"That black lace nightgown you like on me and the panties that match."

She's no saint either though. As she says the words her other hand slides across her stomach to the waistband of her panties, toying with it. Imagining him getting turned on also turns her on more than a little.