@Loulou I know this is a late comment but it's more inexperience that may come off as child like. It also seems to be mainly from the perspective of Tei who met him when he was a child. I wouldn't be concerned at all, his expressions soften but aren't nessarily childlike.
Chronically done with all this bullshit
I also don't understand why so many straight women read BL... genuinely confused because there's also a a lot of them bragging about it for some reason?