Quote Originally Posted by Ryll
Sena's casualness about confessing was a bit of a surprise. She's been very embarrassed about that sort of thing before, blushing and turning away. Not as paralyzed as Yozora is (shaking in fear just from having witnessed that), but definitely not as clear and casually assertive as she was here.
She was thinking out loud. Sena realised afterwards that she confessed, and just went with it.

Were you saying she was unexpected casual about the second part in particular, or the whole thing?

I thoroughly agree with the rest of your post.