@FairWeatheredFriendI had a hard time getting into the story as well. That he didn't leave his wife for being blackmailed wasn't THAT hard to accept. She was after all, blackmailed, even if she found it sexually stimulating. On the other hand, I'd lose all respect for Jeff if he just gave up on a 20+(?) years relationship without trying to salvage it, because his wife climaxed being blackmailed. Long marriages have survived way worse things than one party being blackmailed into sex.. The way he struggles coming to terms with it, and eventually accepting it, seemed fairly reasonable to me. Especially since the reason why she was so easily sexually stimulated was modifications Jeff himself had done to her body, so it was even harder to blame her.
That said, the scenario could have been done better, but I found it at the very least, acceptable.
I thought the first 2 books were pretty good, but Christ, the 3rd book is so.. stagnated(?). First book was 26 chapters, a little short in my opinion, second book was more to my liking at 100 chapters.
Then you have the 3rd book that for some unexplainable reason is at 576 chapters with no sign of an ending. And as you've seen in this thread, many people calls the story out for being repetetive, and it's in the 3rd book most of that takes place. It could have, and probably should have, been edited down to tell a story in ~100 chapters, without missing out anything important and then moved on to a book 4.
As it is now, it feels like it's being written without a clear road map, thus it's filled with padding and repetetive scenarios.