I have few informations from Sayori. Let's start!
KUU-DOLL is a "doll for adults" produced by japanese company G PROJECT. Sayori did illustrations for campaign. KUU is a fresh new item in G's products (25.09.2012). The site where pictures are is for +18. If you don't want to go to the site, I'm posting here some pictures.
G PROJECT: www.gpro.jp/