This is actually one of US8's more normal plots. You should read the one about the honeytrap girlfriend who will explode and blow up the planet if the MC is more than 10 meters away from her.
Going through the game I noticed that `anny_01.rpy` and `anny_05.rpy` both reference `voice` files from`E34-*.ogg` but looking through the files the `voice` files skipp from `E33-*.ogg` to `E35-*.ogg`.
Late reply but for anyone else as well. it is more an homage than a parody. While some characters do get a nod it is a long way from a parody. If you haven't read books a lot of the humour will be lost.
2 routes, True Route and Secret route they say. (3 or 4 routes...you'll need to do both first routes until you unlock all The gallery, then the fish when it talks to you trigger a option idk how)