i'd suggest using rough sex to shut her up.

maybe a hand over mouth gag maneuver.

make it a part of the action.

'im gonna shut you up!'

'daddy huh? daddy says take this like a good girl! - take this don't wake the neighbors'

make it into a game.

'daddy says shut up!'

'daddy says dont move!'

'daddy says call me by my first name!'

...

i think this is doable.

but you gotta be the one to at least acknowledge and say it.

'im your daddy, huh? - well do what i say - stand there, hold this dick, close your eyes,open your mouth - NOT ONE WORD OUT OF YOU!'

... it's doable.

good luck - and please report back.