Helluva Trio pg 63 inks (commentary) (Patreon)

Millie doesn't actually want to be "THAT" bitch.

Loona is very much a daddy's girl, I think, so it made sense to me that she would huddle up with Moxxie when she's mad at "mommy," I guess.

It's hard to tell, but Loona is wearing Millie's nightwear robe while Millie is just wearing the gown portion. The robe doesn't fit Loona and the gown barely fits Millie (which is why she chose it).