For a much larger full version (2455×3472), view either of the links below. I wish I could read Japanese so I could find more pictures like this without wandering aimlessly around pixiv. Oh well, one day perhaps. You can find more submissions by this artist at http://www.pixiv.net/member.php?id=1423422 and I’ll tell you that I’ve bookmarked that member link.
Pixiv Link: http://www.pixiv.net/member_illust.php?mode=medium&illust_id=21136741
Imouto Link: http://oreno.imouto.org/post/show/177212