Well yeah, the point with Tokyo Ghoul is that their romantic/friendships stories not always makes sense. I mean Kuroiwa jr just enter in a shop and see this girl with which he never really interacted before and suddenly they are married. Kaneki worked just a few months in Anteiku and Touka fell in love with her, we are fine until that point... they are separated for a long time and suddenly she ask "are you virgin?" you have to admit that of "I like/love you" to "Let's have sex" is a really big jump.
Anyway the story until Tokyo Ghoul and a part of Re is that Kaneki can understand Eto by her books, and it's dump but that's the story. And they can understand each other so well that Hinami give us hints that he likes her (not her work).
I don't know what to say about Black Reaper, this version of Kaneki never makes sense, he spent five months to find the house of a famous person. You are confusing edgy with poorly written