In thinking about this "correct" use of grammar in writing our stories, I thought about how we use "I vs Me" when speaking conversationally in reality or often times in writing. We all pretty much would say "Johnny and I went to school" which would be correct. But we also more often than not will say "Me and Johnny took a trip" which though incorrect grammatically is more the norm than not because it just sounds better to the ear than "I and Johnny." That would also be the case with the scenario presented by Tirz.
So, let's expand this line of thinking into a hypothetical scene about Tirz's character in Plum:
***Me and Binny got into an argument because he washed my drawers with his crotch rot underwear. So, I slapped him silly when I found out and he got mad and jumped in his car. I'm flipping him the bird while he's driving away staring at me scratching my hooch because just thinking about what he done makes me itch like crazy. When he drove into a fire hydrant and it burst, filling his car with water, I'm laughing my ass off which I shouldn't have done, but it at least made me forget about my itching vagina. ***
Now, mind you, these aren't Tirz's words from her novel, but they are pretty much in character with the voice of Plum though Tirz says it a whole lot better. You might have legitimate grammatical questions from the first "Me and Binny" to the changing tenses throughout, but they all fit with the voice and character even if not quoted directly because the narrator is speaking in a conversational tone to the reader and she is a bit quirky to say the least. That's the way I see this debate about "correct" grammar. Take care. Vern