Well, at least it wasn't one step forward, two steps back -- progress is progress, so yay Hanners! Very cute strip. I also really liked the background in the last three panels.
That may have been a very mild form of flirting, but of the harmless mostly-goofing-around kind. It will take awhile for Hanners to get all the nuances. And considering the way Dora reacted initially to the Cosette situation, maybe Hanners should worry . . . I can see it now: Dora's all "Hannelore flirted with Marten, and she used to stalk him, must . . . kill . . . but she's so cute and I want to protect her, gah . . ." Then Dora passes out from brainmelt and wakes up to find Pintsize groping her. >_> What? It could happen . . . maybe . . . (OK, probably not.)
And a dip-and-smooch is not flirting, it's smooching, duh. Flirting is one part verbal, one part eye contact/body language, and one part trivial body contact (aka shoulder, arm, hand, knee, possibly ear). It's also 100% dependent on context.
Now perhaps Hanners can give Momo some tips on how to be immune to Sven's Care Bear Stare or whatever.