Once Upon a Time, Season 1

Mary Margaret:
Remember when you told me to stay away from David and I agreed?

Emma:
Yes.

Mary Margaret:
I didn't.

Emma:
Yeah, I know.

Mary Margaret:
You do? How?

Emma:
Because I'm sheriff and you are a lovesick schoolteacher. Covering your tracks isn't exactly your strong suit.

Mary Margaret:
I've been discreet!

Emma:
Two teacups in the sink, perfume, late nights, plunging necklines; it wasn't hard to connect the dots.

Mary Margaret:
Plunging?

Emma:
When I met you, you were a top button kind of girl.

Mary Margaret:
Why didn't you say anything?

Emma:
I'm not your mother.

Mary Margaret:
No, but according to Henry, I'm yours.