At Night All Blood is Black

I am mesmerized that so many themes can be explored in under 100 pages (the version I read had 83). The main themes of this book are (in my opinion): war, savagery, and duality, the last one being the most important and prominent throughout the story. So much so that the other themes can be included under duality.
I'll continue with my interpretation of the mind-boggling ending:
After Mademba's death, Alfa is left completely traumatized. For him, Mademba was goodness personified, he was his more-than-brother. As a way to cope with his best friend's death and the guilt for not ending his life when begged three times, he slowly allows Mademba into his mind. That's why he “starts to think for himself”. By doing so, he's letting him live on through himself.
As the book progresses, we learn more about Alfa through flash-backs narrated in the first person. We are then able to understand the importance Mademba has for Alfa. One of the things he points out in one of the flashbacks is that Mademba died a virgin, while Alfa did not (duality). Alfa had sex with Fary. Both boys had set their eyes on her, but she chose Alfa in the end. He felt guilty about this too. He felt like he had robbed his best friend of having that experience and making him die a boy, rather than a man.
In the passage about Mademoiselle François, we get two points of view. The first is Mademba's and the second is Alfa's (both POVs are told from Alfa's body). I interpret that from Mademba's POV that encounter is consensual. It was that experience that made him fully flesh out inside Alfa's head. In the other POV, Alfa forces himself on her. He's aware Mademba is within him and wants him to have the experience he never got to have.
What I still haven't fully figured out is the story of the Princess and the Lion-sorcerer.
All in all, I truly recommend this book. It is beautifully written and the story's captivating from page one.