Pregnant? No, that's no good.

As she continues to beg you to promise you'll fuck her again, her comment about getting pregnant sticks in your head, and you frown. As easy as it might be to command the baby out of existence after the fact, or to enjoy spreading your seed but absolve yourself of responsibility, or to take responsibility and use your power to provide everything they need... you'd rather not go so far right now.

‘My cum,’ you think to yourself as if issuing the command to your biochemistry, ‘Doesn't get anyone pregnant unless I wish it.’ You look at Amanda's pleading eyes and lust-reddened face and backtrack, ‘Unless both of us wish it.’

But simply willing your cum to be spermless, or for women to be infertile to it, seems boring. You want it to serve some purpose, right?

Taking in the sight of the ecstatic girl once more, still asking you to promise her more, inspiration strikes and you smirk openly. Your command continues, ‘But my cum is like a ****. It's not addictive, but it makes sure that any girl I cum inside won't be attracted to anyone else.’

Not bad. It ensures that the girls you find worthy of it will be loyal to it, but without wrecking them with addiction.

It's not enough, though. You want the feeling of blasting your cum into a girl to mean even more, for it to have the weight the sensation deserves. Your mind turns over idea after idea...

It should keep them attractive for you, keep their maintenance low. ‘My cum removes and stops the growth of body hair, weight gain, weight loss, acne and tooth decay. It makes menstruation unnecessary and stops it from ever happening again.’

Oh, you're on a roll! ‘My cum is perfectly nutritious, and it cures and prevents all diseases. And it's delicious; it tastes like nothing else, but it's the best possible flavor for each girl who tastes it.’

Miracle cum! The idea is empowering, and you smile to yourself as the beautiful runner before you begins to look even better, as blemishes you hadn't even noticed start to fade, her tired eyes brighten, and the slight wrinkles around them disappear.

Your chosen girls will benefit greatly from your favor. You look proudly down at the power you hold in your cock, surprised to find it hairless and smooth, your scrotum tight and wrinkle-free around your heavy balls. You must've been vague enough with some thoughts that carrying that miracle potion in your own balls is affecting you.

Well, fair enough. The effects are great for you, too.

You note suddenly that you're quite tired, though. Whether it's because of the use of your newfound power or because you'd be tired anyway, you'd really like to get some sleep.