Hmm. I think my idea could still proceed, but it's not entirely necessary given Cirno solved the space problem already, so I'll ask the player base if we should still go through with it. My idea was/is to recreate the comfort of the chest ride for Cirno through the focused localized growth we established we could do on Day 2; we lie on our side and expand our chest large enough so Cirno can fit in it at her regular size. (This would actually be easier now that the bed is so big, since we've a lot more space to work with before we risk being pushed off the bed entirely by our own chest.)
Of course, this is just an idea for innocent lewd silliness, as stated before, so I wouldn't be put off at all if people didn't want to do it. What say the rest of ye?