Suspicious of AI in “Half His Age”?

**Half His Age** by Jennette McCurdy is about a high school girl who begins a “relationship” with her middle-aged teacher.

As I’ve been reading, I noticed a lot of paragraphs where there are sets of three, trios, triplets, of descriptors (like I just did). I read somewhere that one sign of AI in writing is that it tends to give three examples: something like “he was dark, like a moonless sky, like the sun burned out, like the bottom of the ocean.” (I wrote that without AI.)

Anyone else read this book and notice this trend? Part of me is chalking it up to the teenage voice of the MC who narrates in first person, but I’m halfway and it’s been a more frequent occurrence than I can recall recently.