It's game where the goal is to complete transformation into a woman. Sissification is a process by which you'll eventually achieve that goal. The game does not end until you give the demon enough cum to fully transform you. How fast you acquire shemale characteristics (via giving the demon cum) is up to you.
There is no point in playing the game if you don't like sissification or transformation.
There is no point in playing the game if you don't like sissification or transformation.