I'd be happy to do a quick playthrough and point out any glaring spelling/grammar issues, however it might be ideal to wait until it's all written up, as you may decide to rewrite some of the early pages in the meantime.
By the way, I have no problems with adult themes in games, I think when executed well it adds an extra dimension to a game. It's not a coincidence that most of the best games on this site (and most good movies, for that matter) feature them.
PS Just had an idea for your story, I think it would be very cool if you were able to play as different characters (like in Homo Perfectus 5). it's a lot more work of course, but it would make the game very replayable.