So he was sayin the equivalent of "get used to it because I'm not letting you go anywhere away from me" I also think he has gone back in time, but he gives me the vibes of a 15/16 year old tho and not of an full grown adult. I wonder when he went back in time...
I also think that he went back in time and has the memory of an adult. His mindset, behaviour and knowlege, skills, reading. He might even have a hint, that she isn't his true aunt. Maybe that was a part of his original wish? To have a family, to have a loving mother? And whatever granted him thos wish and sent him back in time also switched his aunt for someone capable of caring for him?
Actually he is! There was a spoiler that I saw that both the aunt and the kid himself were brought back in time, that is why the kid is being cautious to the Duke or what of because the Duke said "he was nothing to him"
Omg! I almost pull a muscle when I read this comment... w-worth it...(⌒▽⌒) I am shook the uncle said that... but from what we have seen of the Duke's habit of saying things people can easily misunderstand I hope this is also a misunderstanding.#－.－)
The duke intends to say that for the boy to be "safe", well thar engrave pain to him ಠ ೧ ಠ
That's possible
You can say it's a contrast between an adult and a child if you get what I mean
I think the grown up Luca was sad because he didn't have anything he could care about so maybe he wished to go back in time and fix the things he could. and maybe his wish came true be he returned to his past. That's why he behaves like an adult. A very good example of this is when they were traveling in the train. Luca showed no interest in the train though he never saw one and he even attacked the assassin like he knew how to use a knife which is very unlikely for a little kid like him.