Okenwa was privileged. Raphael was the houseboy.
Basically, there was a friendship built despite the difference in social class. Okenwa’s family always treats Raphael as someone who is inferior to them. Numerous scenes from the story depicted this claim, most especially, when Raphael was eagerly compliant with what the Okenwa family, specifically the mother, demanded of him. He accepted every insult thrown at him, and despite those words, he silently followed their orders.
So about Apollo. It was an infectious disease related to eye tissue sickness or something. So when Raphael was infected, Okenwa was forbidden to get close to him despite the fact that they shared a bond that no one really knows of. Even the restraint, Okenwa still goes to his room just to take care of him by dropping fluid in Raphael's eyes. Raphael, at some point, didn’t really want to make himself better but Okenwa said otherwise.
But then, Okenwa was infected. He denied to his family that he got it from Raphael, saving him from harsh remarks. The catch was… Raphael never visited him or took care of him the same way he did.
This drove Okenwa to his action. As I have said earlier, Okenwa was privileged. He has the power to turn everything to his advantage and the fact that Raphael accepts the fact that he’s inferior to everyone else, it made it easier for Okenwa.
At the end of the story, they both had a confrontation. But then, Okenwa framed Raphael for pushing him to the ground and it was seen by his parents. Okenwa lied. He claimed to be the one who is the victim despite the truth that he was on the ground solely because of himself. He remained silent rather than taking back his lies in exchange for Raphael’s oppression.
I seriously hate those who had the privilege to make a change but still chose to ride their waves towards greediness. Like, they always thought of themselves in the end and leave those deemed to be below them, in the pits of the ground. *ROLLS EYES*