This story is going to be about a parent and their child having some bonding time, but the child isn’t participating that much. The parent has to take drastic measures and ask a witch to make a regression potion.
The potion would either change them from adult to kid, or from teen to toddler/baby. This story is merely a AR story with the victim not wanting to participate in.
The regression has to be physical, but it can also be mental. You don’t have to make it mental if you want the kid to plead for his older age back.
You can either have the potion passed onto the parent from the witch, or you can have the two have a conversation that leads to them buying the potion from the witch.
Anything is allowed as long as it’s not sexual activities involving children and parents. You can have the kid do something to themselves but the parent can’t be involved with it.
Now, who’s the parent and who’s the child