the I like the idea of over sized diapers and pooltoys. either wet or wet from water. another one is changing while sitting on an inflatable chair. and something with foil balloons. and something with novelty slippers or socks.

I did have this idea of something with pool toys/ or a giant plushie. Def one to consider

how about a adult diaperfur in adult sized baby walker playing with baby toys

Interesting idea!

BDSM mixed with diaper change. Like the diaper is open and all the accessories are there like powder, wipes, fresh diaper..etc. But while the diaper is open it is time for a spanking or CBT.

See I like such things, but I worry they are overdone/ cliche

Hmm. Maybe it could be a "self bondage" thing.
Usually what you see is the "baby" being changed by someone else...you don't see the "baby" putting the chastity on themselves, or the paci-gag in their mouth.

^

Oversized diaper is definitely a fun idea, especially if you're referring to one that goes up to like chest level.

Mix that with an oversized plushy toy (perhaps the plush is alive and has the character under hypnotic control?)

Faulty nanny-bot
forcibly caring for adults like for a baby

Enemas are usually for cleansing purposes. Perhaps you might wish to go beyond that see how big the victim's tummy can get, before you let it loose and make the diaper just as bloated.

Ohhh some ofmy favourite scenarios:

A mind controled AB enthralled by a kids show to the point that they are a gleeful loon: Clapping, rocking in a massive diaper etc.

AB Diaper ad with XL diapers

Sort of a twist on BDSM with diapers: What if the caregiver wasn't in total control? Say The "baby" is having them change them. Relectant babysitter perhaps?