User blog comment:Servant of Evillious/Lunacy Novel Tidbits/@comment-12148883-20130901172816/@comment-12148883-20130901175754

Yes, but why would she give her the key in the first place? She had to gain something out of it. I can't see a reason why that would happen, though. Was she forced to? Did she expect Yufina to do something with it? Who knows.

Yes, the Demons were most surely created by that time, but when did they get into the vessels - and why? That the question that popped into my mind after reading the things about Sloth and Lust here.