Well, maybe Moffat and Gatiss asked Dolly Wells and Claes Bang not to play love and sexual tension between Dracula and Agatha until the last line, but...
You know, there is the thing called honey trapping.
DRACULA
How did you know I was coming?
SISTER AGATHA
There is a man here you consider to
be your property.
DRACULA
My bride.
SISTER AGATHA
He is what drew you here, I think.
DRACULA
A bee can always find nectar.
SISTER AGATHA
And a trap always needs honey.
DRACULA
I don’t think this is a trap.
SISTER AGATHA
It wouldn’t be a very good trap if
you did.
I think it’s so freaking funny that David’s lost love in ATWI80D is played by freaking Janice from Inside Man. like noooo Phileas don’t try to bash Estella’s brains out with a hammer