The artist name is Suzusato Rinka, also called "mage". Here is pixiv page: http://www.pixiv.net/member_illust.php?id=42948&p=1
So far, we have his C83 and C78 on e-hentai.org. It seems he's quite prolific, and yet, we are missing many of his work! I know there are C81 and C82 made by him.