Good points guys. I just looked at it again, and I'm guessing Marisa tried to invite Reimu into Mister's house giving the "Mister can't deny these babies are cute" line, but then he caught them and put them on sticky traps and killed the kos.
buyt said: the new pair are both badged. Meaning?, (shrug)
I didn't see badges on the original pair, so Anon could be showing up a set of home invaders. It could also mean that the process is about to repeat itself and these two are powerless to sit by and watch.