Black Cyc seems to be a good company when it comes to corruption/evil related material.
I think this game has been previously mentioned somewhere in the thread but I'm not sure if any pictures has been posted.
I havent had time to play the actual game, but after going through the game endings real quick using a pre-made save I noticed few endings that seemed to show some form of corruption.
You can grab the CG set from here
http://rapidshare.com/files/211735837/EXTRAVAGANZA.rar
The huge picture features most female characters from the game that have been corrupted/infected.
"Guess what I have behind my back?"
"What?"
"Surprise tentacle sex time"
The game seems to have everything from happy moments and maids to creepy kids eating bugs.
EDIT:
Regular Saturday 2chan thread.
http://jun.2chan.net/b/res/10217365.htm
Might die soon though