This is an coloring of Nagato wearing a bikini. The original line art drawing is created by ゆきうさぎ on pixiv.net. The character, Nagato Yuki is from the Haruhi Suzumiya series. The colors chosen are non-canon, because that’s how I felt like coloring it.
Original line art of Nagato wearing a bikini found here on Pixiv: http://www.pixiv.net/member_illust.php?mode=medium&illust_id=9500752