You work as a part-time babysitter, one day you received a very good offer to take care of the daughter of an ex-rockstar, Daddy Dearest, you promptly accepted because it would give you a lot of money When you got there you expected it to be a small girl but when you saw her you were surprised, she was probably about 20 years old! But... she was sucking a paci and wearing a diaper? Daddy Dearest explained that as a form of punishment for bad behavior he used black magic to regress her mentally (which didn't make much difference) and that he was going on a date with his wife and that he couldn't take care of her. That said he went out with his wife to the date and left you with the woman (He said her name is Girlfriend, but you can call her GF)

GF looks at you with her silly ahh face and takes the pacifier out of her mouth

GF: Bwah... Hie!

She excitedly waves at you