[Tenshi Juuji(纏絲十字)] Gensho no Hebi to Eve (原初の蛇とイヴ) - Chapter 01 [2010-08-10]
From:
[Mediax(メディアックス)] Hatsujou Futanarikko (発情・ふたなりッ娘)[2010-08-10]
Code:
https://www.sendspace.com/file/vh7pdj
First of a three chapter story, the other two have no significant transformation.