What could be more humiliating for your cuckold than the notion that you want another man to get you pregnant?
It's that core humiliation - the idea that you'd rather another man's seed take hold in your womb - that drives the pleasure of this kind of play.
Actually getting pregnant is a lifelong decision, though, which is why I'd recommend faking it instead of making it a real thing.
That's easy, though. You can just tell your cuckold that you've gone off birth control.
Or, you can simply tell him that you wish your birth control would fail and your bull's seed would take hold inside you after he fills your pussy with his potent cum. That alone should be more than enough to excite your husband to the point that he can barely contain his lust.
If you're still using condoms with your bull, you can humiliate your cuckold by telling him that you fantasize about taking your bull's condom off and guiding his bare cock into your pussy so he can impregnate you.
You can tell him that you fantasize about it while your bull's inside you. You can tell him that nothing makes you cum harder than the idea of a superior man getting you pregnant while your cuckold watches from his knees like a good boy. What a thrill.
If your cuckold has gotten used to cleaning creampies from your pussy, you could use this little fantasy as a way of denying him something he's grown to love.
Tell him that he won't be licking your bull's cum from your pussy because you want his seed to have every chance of getting you pregnant so you're going to keep as much of it inside you as possible.
This is a form of humiliation that works when it's just the two of you, too, so don't be afraid to indulge in a bit of pregnancy-related dirty talk when you're fooling around with your cuckold, especially if it arouses both of you.
If you want more cuckold humiliation content, then visit my Patreon page and read 'The Cuckold Humiliation Handbook."
- Sit on his face to kick things off. Have him put his tongue in your pussy. Rub your asshole over his forehead and nose.
If you're in the mood, pull your hips forward just a little and have your cuckold rim your ass too.
All of it will put him in the right mindset to be a good boy as a superior man fucks you from behind.
- At some point during the cuckold 69 - or at multiple points - he should suck your bull's cock. Your bull could have him do it before he's even penetrated you.
In fact, you can use your cuckold's desire to see you get fucked to motivate him to suck cock by making it perfectly clear your bull won't be pounding your pussy until the cuck does his duty and sucks dick.