Kagerou and Yamato both clearly have a package. Who knows if all of them are but are not showing it. I am not seeing any vaginas for that matter, just saying..
Maya's Schroedinger: she could either have a dick or not in this image.
..Right. I guess that makes two who can grow one at will, with the other being Isuzu. That is, unless everyone can and it's just up to their preference.