This was all a bit unripe and not completely thought through.
Where was the bloody editor?
The author seemed to forget at times that the different characters should react with each other. Every time we experienced one POV the author seemed to completely forget the other character and how he would normally react in that situations.
A human not aware of the supernatural world, would be at least aware, surprised and mildly shocked to the unknown situation of getting bitten and knotted for the first time during sex and would react accordingly. But surely not ignore it, like the author did.
A human would wonder how he can sit up, eat and move with such lack of pain and not pulling any stitches after being stabbed in the chest, not hours earlier. To be healed in such a manner he is able to have rough sex, lying on his front and then weed in the garden not a day afterwards with a chest wound. And not having taken any pain medication or pulled any stitches. But surely not ignore it, like the author did.
When an author doesn’t even do its research and do the minimum of researching that the “meaty” part above the clavicle is not part of the chest but the shoulder/neck area, and not how it is described in the book. It is sloppy work. I would expect a higher personal standard when publishing a book and wanting to make a name of myself and be proud of my work. And why a “killer/assassin” would stab you in that exact area and simply leave you, without checking you are really dead, is also simply silly.
Sigh, there are a lot of such amateur incidences and situations the author sadly failed and no one seemed to point it out. It could have been a good book. The story in itself was interesting.