The author does a good job is making stories short and sweet- I doubt it’ll be that long.
The novel is really not that long. And he find out he's an omega with a son not super late he is just not aware it is HIS son
He tells him about Pete at the end of the main story, the other kids are born much later. The second son is only in the epilogue, you only see/read more about them in the extras of Kiss me Liar, because it's a few years into the future and they are friends with Spence.
The main story is about 2/3 done, so probably around chapter 40.
After that we hopefully get the extras, but those continue the main story and one is about when Josh presented in highschool.
Someone kinda spoiled it a while ago but Chase isn’t gonna find out about his son (and I think one or two other kids he has with Joshua) till the end of the novel. So I wonder if they’re really gonna keep that for this adaptation but I hope they change it cause it already seems this will be 100+ chapters. And Chase being oblivious till the end of the book is egregious no shade.