That's the most romantic thing he's ever said to her, or at least in reference to her. She doesn't say so, but he might notice the way she pauses in helping him with his shirt so she can smile. Then he has to go and wipe that smile right off her face by mentioning his mother, which really isn't the best thing to do when you're taking off someone's clothes and you were about thirty seconds away from potentially having sex for the first time.

"I was only messing with you, Frank."

Finally, the shirt comes off and she sighs in relief. It's folded up and set at the foot of the bed in case he wants it later. She's guessing he probably won't.

"And maybe I was trying to get you to talk about your childhood a little."

They're together, more or less. She wants to learn all that she can about his past.