It's only a 5 year gap. He was like 14-15 at most when they met.
Kids call kids younger than them kids all the time.
He took more of an elder brother role in raising her too. So more like just an older kid looking out for her than actually adopting into the family. Even the others in the village call her his "sister"
Gotta also remember in Asian countries it's common to call older kids in the neighborhood brother or sister. It's a term of endearment not really a sibling dynamic. She's adopted into the village as like a child of the village not necessarily into his family.
And considering his young age when they met... It's be super weird to call him her father figure when he was still a kid himself.
He's just a really buff kid, they mentioned she is small for her age too. The people of the village seem to be bigger and stronger normally
I'm from Asia and noticed how I didn't even care about the age gap and their dynamics because what I found creepy is the difference in their appearance.
"kids calls kids younger than them kid all the time??" and its about the ML who looks like a brick college student while the FL looks like in elementary school.
Anyway if you enjoy it then good for you, it's really just a matter of preferences. Nothing to be arguing about.
I mean I can understand that but there was never any romantic anything when they were young? It was essentially a "here's how they met". They were trying not to die for most of it.
Yeah dude is huge but he lives in the mountains and is from a tribe of people with genetics to survive that. Ofc a teen boy in that environment is going to look big as hell.
No hint of romance appeared until the time skip. Just two kids helping each other out.
Like not even a blush in sight.
Idrc about the reasoning cause it sounded like "oh it's okay if she's a lolicon, she's actually a 1,000 yr old dragon that has been curse". But I understand people who likes size difference... If this is a novel I would eat this up cause I can imagine whatever I want to, but seeing them together looks weird.
I have a lot of younger kids around me that I helped out throughout my life and I would never think of them as romantic interests even after timeskip. I can't help it if I'm being creeped out.

It's creepy how small the FL is compare to the ML and him calling her a kid all the time as her guardian. I like the story and would have bookmarked this if it wasn't for the "I raised my love interest" plot.