I found artist___unknown_14's pixiv account:
http://www.pixiv.net/member.php?id=13360
, his nickname is 4倍あき (4bai-aki ??).
post #27110, post #28145, post #27730, post #27133 and others can be found in this pool/gallery:
http://www.pixiv.net/member_illust.php?mode=manga&illust_id=13913665
He is also referred to as よんばいん (yonbain ??) in the gallery from forum #495, compare:
http://loda.jp/otaku_13854/?id=294
to
http://www.pixiv.net/member_illust.php?mode=medium&illust_id=13854609