Tbh just like some comments here, at first I thought it will be something like grooming, but when I tried to re-think about the relationship they have, I changed my mind.
The older guy taking care of the younger guy because he wants to escape from his guilt/sin towards his deceased younger sister. Especially whenever he find out that the younger guy was bullied by his schoolmates, that feeling is getting stronger due to the same experience his sister had.
"If I save this guy, it'll be my atonement towards my sister".
Currently, the older/younger guy has no romantic feelings towards each other. Their relationship is still quite fragile. The older guy wants to atone his sins towards his sister, the younger guy wants to live normally with his mother.
Both of them have a goal for their own satisfaction. The younger guy still doesn't 100% trust the older guy. If there's a problem that will attack the younger guy, I'm afraid it'll destroy everything.
Maybe it'll take time for the relationship to be changed, but I'm not certain about it since I don't read the novel.
Tbh just like some comments here, at first I thought it will be something like grooming, but when I tried to re-think about the relationship they have, I changed my mind.
The older guy taking care of the younger guy because he wants to escape from his guilt/sin towards his deceased younger sister. Especially whenever he find out that the younger guy was bullied by his schoolmates, that feeling is getting stronger due to the same experience his sister had.
"If I save this guy, it'll be my atonement towards my sister".
Currently, the older/younger guy has no romantic feelings towards each other. Their relationship is still quite fragile. The older guy wants to atone his sins towards his sister, the younger guy wants to live normally with his mother.
Both of them have a goal for their own satisfaction. The younger guy still doesn't 100% trust the older guy. If there's a problem that will attack the younger guy, I'm afraid it'll destroy everything.
Maybe it'll take time for the relationship to be changed, but I'm not certain about it since I don't read the novel.