At the risk of breaking some hearts, no, there won't be any kind of harem or poly ending. I never intended on it, and if I suddenly now decided to somehow shoehorn one in, it would feel incredibly forced and unrealistic. To be honest, I really dislike that stuff in general, unless the game only had a single ending. Otherwise, I dunno, it's just too... perfect. In my opinion, the player being able to have their cake and eat it, isn't all that interesting, and removes the need to make difficult choices, which I do find interesting. If you're interested in other characters, great, but then I'd suggest you keep multiple saves going to experience their content, also.