>>23653

>>23191 is by Nagi. Most of his stuff is on pixiv (http://www.pixiv.net/member.php?id=1000460), some on e-hentai.org (search for "nagi guro"),
quite a few pics that can't be found anywhere else are on http://board.sweetnote.com/geso9q9q/ (you'll have to search quite thoroughly)

>>23645 and >>23646 are both by zmc118 who can be found on http://dxyc2009.forums-free.com (I hope you speak chinese lol). I'm sure I've seen his profile on pixiv, but can't find it atm.
Here's another pic by zmc. This and the two already posted are the only ones I've seen.