Kingmaker711 is a great and prolific author who’s written some very varied stories.
He’s written both a few parodic stories and fully original ones.
His most well known are taking place in the “Morgana Universe”. It’s one of his original creations and it follows the adventures of various characters in a medieval world where an evil sorceress has risen to power.
There is quite a lot of erotic transformations and corruptions in all of his stories.
He’s tackled a lot of stuff: demons, vampires, succubi, dark witches, ancient gods, aliens, cyborgs…
Here is the link to his page with all of his stories:
PS: Concerning the Morgana Universe, I’d start with those stories: