Copipe!

Futa warning. And that's not the half of it. Lovely Miku and her brother Yukito are victims of onee-chan's new invention: copipe gel! From the Japanese copipe meaning "copy" this gel turns the siblings' world inside out. Yukito gets a "copy" of Miku's ample breasts and Miku gets--er, well, you get the picture. Erotic chaos ensues as everybody--including onee-chan--takes advantage of this bizzare situation. (And then add love to the mix...)

(Source: MU)