Okay, I'm goint to bed. In the quite like event that the talk with Shuuei after leaving Yukari's happens before I can get on again, here's where I'm going with this:
Once we leave Yukari's, the plan is to bring up Shuuei's reaction to the entering-our-mind idea; specifically, the fact that she was unwilling to do that to us. Mention the fact that even when directly presented with the idea of dying if she refused, she still refused. Tell her that this means she cares about us. Also, try to get this in somewhere: "You should also think about what it means that I am willing to do such a thing. It means that I trust you completely, trust you enough to open everything I am to you. Words cannot describe how wonderful it is to have someone you trust that completely, and it is a feeling experienced by sadly few. Having someone I trust that deeply is a joy and an honor that I am truly blessed to receive." Feel free to tone it down if you think it's too corny or sappy or anything, though.
And with that, good night,and good lu-*shot*