I think the blond guy knows, that's why he's still smiling in the last panel. He must've definitely seen how black the child is, he wanted this. (why is the girl smiling at the camera tho?)
Since he is smiling in the last panel: Isn't it possible that one of them has a black parent and their genetics came through? It happened in the real world a few times.
It could also be that he is impotent and the child is the product of a surrogacy, adoption or artificial insemination.
Since he is smiling in the last panel: Isn't it possible that one of them has a black parent and their genetics came through? It happened in the real world a few times.
It could also be that he is impotent and the child is the product of a surrogacy, adoption or artificial insemination.
OFC, but this is not what the author implies here.