And He Chose That Particular Reading of the Line Because?

"Doctor."
"Master."
"I like it when you use my name."

*blink* *blink*

And suddenly I understand why there is Doctor/Master fic. (Don't want to read it, but I can understand where those who do get the idea.)

ETA: "Are you asking me out on a date?"

I think the line reading was on purpose.