I know this is an old story, and have no idea if the author is still around, but I wanted to say that I just now found it and enjoyed it and was a little disappointed to find there was no part 3.
Mum always used to joke when she saw me in a cage that I was “Jill the guinea pig only ever happy, safe in her cage” and that she could save a fortune in babysitting cost just by locking me in a cage.
This was the part that grabbed me; the playfulness is great, and this sort of backstory fleshes out both the character and the kink.