Here's a little something I never thought I'd see...
A doujinshi based on the Cream Lemon OVA Evil City Astalot
http://g.e-hentai.org/g/129409/a3e0396568/
Cream Lemon is an early '80's hentai anthology original video series.
Evil City Astalot more often referred to Magic City Astaroth is a fantasy segment that has a band of Elves fighting demons who are trying to revive some evil Demon Lord that was defeated centuries ago...In the opening battle a human priestess who aids them using magic is captured leading the protagonists to take up the chase. The demons take the Priestess to some evil shrine where she is injected with some sort of aphrodisiac from a tentacle and raped by it. In the process she is encased in a membrane that fills with slime. When the heroes reach her, the membrane ruptures and the Priestess is released though now reincarnated into a demon who now serves as the principle antagonist. Never seen any subtitles for it though I suspect the corruption was more of possession and bodily corruption since the Priestess' spirit plays a role in the demoness' undoing but there is obviously some sort of submission on her part to the evil force...The setup for the corruption though is fantastic my only criticism is that the transformation process is obscured by the slime.
Much to my surprise this doujin depicts the corruption segment and produces a much nicer looking version of the demoness...
The zip includes a few highlighted caps from the anime