Aduma Ren — http://www.pixiv.net/member.php?id=67073

Also known as Azuma Ren and East of Rest Station

Babysitters K-ON! Doujin released Aug 3 '11 Lots of sex NSFW Nodoka x Ui Yuri

Sweet Girls K-ON! Doujin released Aug 30 '11 Lots of sex Masturbation Mio x Ritsu NSFW Yuri

Babysitters 2 K-ON! Doujin released Jan 14 '12 Lots of sex NSFW Nodoka x Ui Toys Yuri