Jim B:
she said,"hey i'm just sayin' its a common fantasy of housewives."
I wouldn't recommend dumping every detail of your fantasies on her at once. Maybe at a point when she is nice and horny, remind her about that comment and ask her if that's something that she she's fantasized about. Let her know that you're not looking to judge. Tell her you're interested in her fantasies.
You could also use her 8" dildo while you are with her. Start talking a little dirty and build your way up to something like "you like big cock, don't you, dirty housewife."
Just my two cents.