The way my eyes widened when he said uncle…

Thing is: in most languages „uncle“ doesn’t mean someone you‘re related with by blood/in a sense of family. But in the context of this story, well for me as of ch. 2, it seems like as if they are indeed somehow related family wise. Blood related or not, him saying „nephew“ was not necessary and ruined the entire concept of it just being a normal „age gap story“.

Yeah, I know! Which is perfectly fine, but since they’re probably related… I agree. I don’t understand what the mangaka was thinking.