Well clearly you should know the main structure of the story you are writing. It is was centered around Female Age Regression and you had a babysitter and a child, then you are fine. If the author lays ideas down, you pick it and he continues to write. Or everyone chips in on what they want it to be. But it would be set as a general story. Like this.
Babysitting and Diapers
You are either the babysitter or being babysat and someone will end up in diapers.
This is a story about a babysitter who babysits a couple of young girls (10 and 5). You can choose to be babysat or the babysitter. Someone will end up in diapers. It can be you or the other people. So you could be the babysitter and end up in diapers or diaper the girls. You could also be one of the girls and diaper the babysitter or get diapered yourself. The babysitter will be there for a week, while the parents are on holiday
No sex scenes, no murder, no regression (However becoming more dependent on the one who changes you is allowed)
Connor: The male babysitter
Emily: The female babysitter
The 2 girls are: Hannah (10) Hannah doesn't like babysitters much, she believes she is too old to be babysat. She is the one who is most likely to try and trick you into diapers e.g bedwetting prank. If she can get you into diapers and locking panties then she would be very happy
and Krista (5) Krista wets the bed, this means that there are diapers/pullups in the house for someone to wear
You have the following choices:
1. Emily (Female babysitter)
2. Connor (Male babysitter) *
3. Hannah (The 10 year old being babysat)
4. Krista (The 5 year old being babysat)
Credit goes to Writing.com and their helpers to make this. I am using this as an example. So this was their work that I posted.
But this is ultimately what I mean.