I used a free music track called 'Ritual' for this scene.
The corruption path will involve Valerie using dark magic frequently (often for selfish purposes), as well as becoming much more perverted. Over time, she can gradually assume more of a demonic appearance, with a tail, wings, horns, and potentially even a womb tattoo.
Of course, the love route will feature plenty of sexual content as well, but corrupting her opens the game to various other, more 'hardcore' fetishes.