"Between you and I, there is no need to say 'thank you' or 'sorry'."

My honest opinion would be the story concluded just okay. I personally felt that there's a few plot holes that could've been solved in a better way, and some unsaid things said, but overall, I'll not complain of the plot and the ending.

And forever after, his eyes could never move away from him again.

The part I disliked most about this volume especially is because I personally didn't enjoy the spice in the plot. I felt like an undead corpse dragging my body across to finish those scenes, especially that extra number 2 (iykyk).
It felt like a Wattpad fanfic of "porn without plot", and a little bit out of character for the characters. It felt weird, strange and questionable. 
 So yeah, those were the reasons I could not bring myself to give high praises for this series.