Idly I ran across one of your ideas that sparked a bit of intrigue... and could even spiral off of the club idea to give us a rich storyline start. It certainly perks my curiosity.
https://diaperedanime.com/forum/show...x.html?t=23154
I could see a progression... AB/DL Club Auction. My character utterly bewildered by such things but it's for a good cause/charity etc. which is usually for like a weekend or week.... Person bids an insane amount for an even longer period of commitment. Which tends to either be like arm candy like escort or serving some function like personal aide or what have you.
Some playful socializing and make some fun teasing and such. And then she (or he, I'm easy) takes their 'purchase' home with plans to turn them into their perfect 'little one' through a variety of methods.
Now either they could say that the position they have for the period of service is a consulting physician to try to help these kids at the above place.... then tables are turned on him as he's a patient getting reconditioned. Or he/she takes him home and enacts those plans personally. Could easily mingle it that purchase is one of the staff also. Wanting to try some new methods on someone. I am just spitballing the plot train.