https://www.pixiv.net/users/230605
https://www.pixiv.net/stacc/sergei
https://twitter.com/pattundo
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https://sketch.pixiv.net/@sergei
https://www.tinami.com/creator/profile/35907
https://pattundo.tumblr.com
http://www.doujinshi.org/browse/author/99480/
http://pattundo.exblog.jp
