Quickdraw McGraw - "Monique" (Patreon)

"That's is, sweetie. Shake, shake, shake those silly big girl  thoughts away... Feel the way the plastic balls jingle and clack inside  the rattle? Do you know how many balls are inside your little rattle?  Twenty-four! That's a big number. I doubt a sweet little baby like you  could count anywhere near that high anyway. And each of those little  plastic balls is for one hour. So every time you shake your little  rattle, twenty four little hours of your little brain gets flushed down  the potty. Remember the potty? No? That's perfectly fine, sweetie,  because that little tushy will never, ever, EVER sit on a potty again!  Just soft, fluffy, absorbent diapers for you. And all for the better,  really. You've slipped back another month just int he time I've been  talking to you."

I've always liked the idea of an ABDL shaking a rattle and with every shake they lose a day's worth of mental development. So after a few thousand shakes any adult can become a little baby again!

Alt versions available below