Let the horse cum in you more
From Create Your Own Story
You decide that since you're already full of stallion sperm, there's no reason to stop him now. Besides, you haven't cum yet and it wouldn't be fair for the horse to have all the fun.
You start moving your hips rhythmically, squeezing the massive shaft with your vaginal muscles. The huge cock stretches your pussy painfully, though you consider being stretched might make it easier to give birth if you've been impregnated.
Despite your lack of experience, you find dirty ideas come to you quite easily while the horse fucks you...
Fantasize about giving birth to a centaur.
Move the horse's cock into your asshole.