Should be 100% of the pictures from the gallery of Pixiv artist Emperpep. I gotta say, his artwork is beautiful. If you usually skip character art and go for the porn, don't do that in this case. All of the art is amazing.
http://www.pixiv.net/member_illust.php?id=784058
Gallery order + Navigation Links
(1) Main 18+ Content (images 001 - 186)
(2) 51 picture Charlotte and Houki sequence (bondage) (images 187 - 237) Direct link: /s/deb5331b71/882337-187
(3) 88 picture Shana and Rosa sequence (bondage) (images 238 - 325) Direct link: /s/b950b4dc3e/882337-238