These are two contradictory statements....
Either the story is guiding you and you can't know your ends
Or you have your ends and the previous comment was false?
Also as the dev, how can you not know how many end you have or when they're available...?
Dude, I'm all for you doing the story you want to do, but just be straight about it. This came looks like it has great potential, but right now I have zero faith or trust in you based on your comments, so it will be one that I'd have to wait till it's done and see where you finally come down on things before touching it.
They aren't contradictory. Because there are different paths, there will be different endings. I know where I expect the different paths to lead, but that doesn't mean I have the endings written out. This isn't Harry Potter; I'm not writing the story to get to my ending.
While some writers plan out everything that's going to happen before writing the story and stick to their outline, no matter what, I can't do that. For example: I was just writing a day 2 scene with Julia. In my outline I had certain things happening, but as I wrote it, they didn't fit, so those things are being pushed to a later chapter. Maybe those things will never fit the story. I'll have to wait and see.
Many writers let the stories guide them as they're being written. Stephen King has written about this many times, that his stories surprised him when they went in directions he didn't see coming. That's what I'm doing. Are there things I know will never happen in this story? Sure. Aliens aren't going to show up and capture everyone. Maria isn't going to snap and murder everyone in their sleep... I don't think. But, if there is a possibility of something happening in the future, I'm not going to say no.
Here's what I'll say as an absolute: Big John will not romance nor convince all of the girls to be his. Or
any of the girls. This is not his story. None of the girls like him or want him there, including Linda. For Linda, he's a means to an end,
which began as an escape but evolved into self punishment. If you're playing this game to see Big John have his way with everyone, don't bother. Will Big John get any unavoidable action? Nope. Will he get any action? Maybe... I'll have to see how things go.
Edit: I should add that I won't be making changes to the story based on public opinion, unless I specifically make a poll about it. That would be more for interactions between the MC and others, and not to add NTR content.