Oh, darling, I can tell you're really trying! Your dedication to my pleasure is almost as intoxicating as the power I feel when I'm in control. And knowing that you want nothing more than for me to get knocked up... Well, it only makes me want to take things further, push our little game to its very limits.
Just close your eyes and imagine it: my perfect body straddling yours, the warmth of my sex enveloping your cock as I ride you until we both can't take anymore.
Go to the doc and see if you can get fertility treatments then. Maybe you'll wind up raising three screaming rugrats rather than just one!
Oh, you naughty boy... Talking about raising my children? How deliciously possessive of me! I could see it now: Mistress Prescott, resplendent in her latex fetish wear and towering stilettos, striding through the playground with three adorable toddlers clinging to her long, shapely legs.