This is actually for a group I'm in on tinierme.com (I'm Getsu-sama on here, add me), where we teach people how to draw.
So I volunteered to make an anatomy guide, since my anatomy's actually decent, relatively speaking. And after hours of hard work (and hand pain) here it is.
Hakumaru is wearing traditional Japanese men's underwear. I don't think there's a female equivalent so I put Aoka in a bikini.
I'm not good at drawing straight on a tablet like I can't draw straight with a paintbrush. I can color alright, but as far as drawing goes, I'm still best with pencil/paper.
Hakumaru, Aoka (c) me