I'm not sure specifically as there could be many novels by 'mothy'. It might be a new creation with unique characters, a new plotline, perhaps in a genre like fantasy or mystery.
Rick's origin story has some key aspects. He was born into a world with certain scientific limitations, but his mind was far beyond those. He started breaking boundaries early on. His origin might also involve some sort of trauma that made him so detached from normal emotions. We see his character constantly using alcohol and going on wild adventures as a way to cope or perhaps forget his past.
Well, in the world of fanfiction, people can take characters in all sorts of directions. But in the context of 'Rick and Morty', the idea of Rick abusing Morty in the fanfiction is a deviation from the show. The show focuses on their interdependent relationship, with Rick being the brilliant but flawed mentor and Morty being the somewhat naive sidekick. Fanfiction writers might create such scenarios to explore the darker side of their relationship, but it's not a part of the main narrative.
There are indeed Rick and Morty comics. They're a great way for fans to immerse themselves deeper into the world of Rick and Morty. The comics sometimes explore concepts and characters that might not have been featured prominently in the show.
Rick is indeed infected in the comics. The infection adds a lot of tension and drama to the story as it affects his actions and the relationships with other characters.