I am jumping in years late on this since I only just found your post, but at this point in the series I think it's clear that Chime and Moon are sleeping together, although if you asked me to point to a passage I'd have to go find one (where Chime is climbing out of Moon's hammock or vice versa).

(ps: have you made any Moon/Jade icons for your adoring public? :D)

(double ps: I'm totes going to start a Yuletide campaign (insomuch as I can) for more Raksura works.)