Great story so far. You are doing really well, thank for those two chapter. I really love how crazy Akane is. It could be fun to confront her with a prudish, kind of demon (a bit like Scanty and Kneesocks if you know the anime Panty & Stocking with Garterbelt). Plus the demon could to force a little of decency and proper behavior in the head of all those peoples, or at least die trying.
I also really want to know where Leanne placed her sigil. And the stretching of Akane's one, does it have any effects on her powers? If it have any kind of positive effects, I fear the reaction of Akane when discovering it. Does she really need more encouragement to brutalize this poor organ?(Yes)