That's why I brought this up in the forums. I guess Yukkuri(Anelaid) would have the final say about this.
As for the source,
http://www.angelhalowiki.com/r1/...1%A0%20%EC%95%84%ED%82%A4It's a page in a Korean wiki website (not yukkuri-related, by the way) talking about this artist. It mentions that "The artist is tagged as 'ammo' in western image sites because one collaboration of his notable images was marked as made by 'uzi_ammo_666' leading most to identify him as ammo. It is unknown whether the image was made by baccha-aki himself, but it is possible that uzi_ammo_666 is one of his old usernames."
http://www21.atwiki.jp/futabayukkuriss/pages/65.htmlPlus, this is a page in Futaba Channel I found with the keyword ばっちゃあき. It apparently mentions(Google translation) that the story is based on baccha-aki's drawing, which is posted at the bottom of the story with the comment "元ネタ絵 byばっちゃあき (Original image by baccha-aki)".