╥﹏╥)/ I like the side story and hope its true as I wish everyone a long happy life after everything. If I was in Lucas's position, I'd do the same for my loved ones too. I can see the rooted anxiety he has in keeping those he treasurers close and stay with him for as long as he possibly can.
Yeah it sounds so sweet. Especially when you learn that Lucas didn't even care when his real family died. But he saw his teacher be so sad when his family died and then he himself was devasted when his teacher/replacement dad died so he didn't want to experience that again with Athy and his new family who are the most precious people to him and he didn't want Athy to experience it either
Spoilers??? Take what I say with a grain of salt because it vaguely remember everything and I might be wrong lol
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So I saw some stuff from the novel maybe idk I kind of forgot but it's side story stuff from the novel.
So basically I saw that Athy doesn't get married until much later and in fact gets married later than most princesses traditionally do because Claude wanted to keep her by his side as long as he could.
I also saw that she also broke tradition where usually the princess moves out she remains living in the castle because her husband Lucas is obviously the tower magician. I also saw that Athy and Lucas don't even kiss until her 18th birthday and before then they never spoke much about romantic feelings for each other but I guess they just felt it
Lucas grew up in a family who did not love him and was serparated from his brothers because his parents feared how strong he was and thought he might kill them. So the tower magician he met and lived with for a long time became basically his father and Lucas never admitted it but he did think of him as one. And Lucas cried for the first time when the magician died (he committed suicide after his last child died) and he cried for days and was really sad because he was the first person he loved and who loved him back. :( poor Lucas
Also I'm not sure how true this is but I think I saw a side story where Lucas gave them a magic potion so they could live a long long time. This includes Athy Claude Felix and Lily(forgot her name but the nanny) but I don't know if he told them or gave it to them secretly lol