For those who don't know, this was made in contrast to the recent released friend in global Lost Word game, which is TD Seiga that... has those huge personalities in-game.
And yeah, you don't need to tell us where to look at anyway, Seiga...
These two really need a canon interaction so badly from ZUN considering that they both are related to each other, and fanon alone won't do the deed much overtime.
I'll be forever curious about how a body of a doll youkai looks mechanical yet somewhat fleshy on the touch.
This Yohane's pairing is always fascinated me the moment I read the mangas that consisted of these two a while ago here, and just how the author keeps nailed the expression of the characters are always impressed me.
Having Tsukasa as a stress relief seems appropriate for the two of them, plus they get to teach her some manners at the same time for what happened during UM.
It might be a plausible theory I have that their defection from the moon might be the reason they both lose their ability to even process a simplest thing in mind and slowly turned into a mere rabbit psychologically, and seeing Reisen understanding what they're saying at the end is because of her ability is well trained as an ex moon rabbit soldier to counter the effect unlike the two of them long time ago.
It does a bit hard to tell, but if you have a good eye you'll notice the size of the square dialogue font at the beginning indicating who we're hearing thoughts from.