While there will be a book 5, as I understand it, it's going to be more of an epilogue than a full blown chapter. I don't know what all that will mean. Maybe it means it's going to be very short (I mean, there's only one more version number before 1.0). Maybe it means it will be about half the length of a full chapter. I don't expect much of anything in it: maybe one or two scenes with all the main characters throughout the game again, MC finally taking care of snake lady (or whatever the issue was that caused him to be pulled away from his body in the first place, I don't really remember), maybe a sex scene or two with her and her sister / other half, and the reveal about how all his girls know more about the situation than he does. But beyond that, I don't see much more happening in the final chapter. Unless the snake lady's problem is going to be solved via a minigame. Basically, the epilogue is just going to be a sex marathon with all the characters and a few reveals. And as someone said, maybe Marty will come back to this game every so often and add a scene when he gets the urge to, but that would be it.