Has anyone figured out what determines a successful temptation resist? I have now played through this mission on two completely different playthroughs, once with Isabella and once with Merril as my lovers - both with max friendship upon doing this quest. They both betrayed me in both completely separate playthroughs (with different choices made throughout). I never sided with the sloth demon though.
It's kind of annoying, since it seems like a significant point, especially in terms of Merril - many party members remark how she was once successfully tempted by a demon (I'm assuming they're referring to this quest) and try to imply that hers and the champion's love cannot last because of that. I assume that different dialogue should occur, if Merril can resist temptation? I really don't know.