Not many chapters at all if any.
You see a couple things around chapters 45+ but not hardcore yaoi. Just a couple scenes.
There is one bi character but you mainly see him with women. There was one scene when he was with the guy but it didn't last long and didn't get very far.
If you want yaoi I would read a different book.
I don't know how far you have gotten but it is worth reading a bit more cause it is pretty interesting.
pretty much none but trust me... keep reading it's amazing
If you wanted yaoi then just click off. That's not the focus of the story. There's only one yaoi moment and it's pretty light.
at what chapters are the yaoi parts? pls tell me