Not often you can have a character say a line like this but have a reasonable motivation.
Before he gets a solid gender, how does Kuroumaru pee? Does he have some sort of non-sexual hole on the front for that, or does it just sort of mix with his poop like a bird?
There are five more pictures that are on par with the same awesomeness of these in the source. Do yourself a favor and check ‘em.