I LOVED this story as a kid as well. I wrote a rather perverted erotic story around this idea where a modern day Gretel gets fattened up to massive proportions by a witch.
I have it for sale on my e-junkie store but I think I'll give anyone who discovered it via this thread a copy for free
Go to my e-junkie weight gain story site:
e-junkie.com/282360Add the stories to the shopping cart:
Gretel's Never Ending Gluttony Part 1
and
Gretel's Never Ending Gluttony Part 2
and then enter the discount code:
FANTASYFEEDERSECRETIt should bring the price down to $0.
(let me know if this doesn't work for some reason).
Enjoy
Warning: the story contains force feeding, graphics sexual descriptions, sub/dom, and lots of naughty NSFW stuff, no longer a children's story LOL.