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I believe it is the same for all characters. 1000 for level 1, 2000 for level 2, 3000 for level 3. Either that or it is just 1000 for every level.

I got Viki to level 2, then one morning, the succubus was all like "Oh, she's level 2 now, let's do something with her."

Nevermind, not sure what I did. All I know is to make sure you do the event where the succubus realizes that Viki reached corruption level 2. I think that is what did it.

I'm stuck at level 2, 2000 corruption. I have a very vague idea that I'm supposed to convince Kelly to go without panties to get level 3 corruption, but I have no idea how.