Midnight Cat — http://www.pixiv.net/member.php?id=966150

Also known as 子夜貓 and Ziye mao

My beloved Christa, may I kiss you Attack on Titan Doujin released Jul 30 '13 Christa x Ymir Yuri

Puppets Attack on Titan Doujin released Oct 8 '13 Christa x Ymir Drama Spoilers