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The ones you've linked are too realistic (except the one at the end where she's fully-clothed - that isn't pornographic, so it's fine). The rest of that artist's works don't seem to be, though.
Is there a difference between post #2666736 and the artist's pixiv upload? www.pixiv.net/member_illu...um&illust_id=58724288 I would post it, but I can't see anything that's different other than the artist's Nijie upload is a slightly smaller filesize.