Sorry I had to get back to the code to check it over. During the first Chapter when you get to the part where you have to choose to give in to the corruption or resist it, follow this:
Give in to the corruption
- "If your so concerned about my body language, you don't portray it well"
Would you not say that is a valid hypothesis?
- "Yes."
Converse with Yukine
That should get you to the devotion point your looking for.