@sunmoonmoon: (1 year later) It's case-by-case, but it GENERALLY is an act of giving it partial thought, catching one's interest when they initially weren't, or being condescending. You know how in some manga royalty would close both eyes when making a statement of some kind, exuding as being someone important? Same idea. In Krebscrum's case, she's giving it thought and opened one eye to show she is considering it (the partial thought I mentioned before).
I honestly thought they would make mention of Krebs coming from Rem's body due to Diablo's energy-injection.... as an excuse for them to become her parents.
Kinda disappointed they didn't. That could have been hilarious.