Is it possible to change Anna from pure to slut when she already switched her clothes? I noticed that with "spilled milk" even you can, my guess, slightly corrupt her, but how much would it take?
I don't think you can change her Route no matter what you do once you already have Anna on 3 Hearts or more.
When she has 1 or 2 Hearts, however, it is still possible to change her Route by choosing certain dialogues while progressing further in the game.
