I've written a number of genie chapters over on CYOC. Here's what I could find. Some of these have following chapters that I wrote; you can also go backward from each chapter to find more genie content by other authors. And feel free to add on to my chapters if you get inspired (which is the whole point of CYOC!).
You Probably Didn't Dream of This Genie
Not the Disney Version
No School on Satyr-Day
The First Wish
Bye-Bye Boobies (But Hello Something Else)
Jenny Comes Up with Her Own Improvements
Josh Dreams of a Genie
Curiosity Killed the...Dog?