I'm glad you enjoyed it. ^^
There's the posibility where Neus can become futanari in the very ending of the game (it's illustrated and available) you have to give her at least 3 orgasms when you have sex with her (against her order of you not to give her any orgasm because she loses control).
The part where you become a woman it was another game called "Pact with a Witch: REDEMPTION" where you are the one who becomes a woman instead of Didac... but that is abandoned since I found not much interest, and besides I didn't even finished the main game yet. ^^
Thanks for the interest! ;)