Then they can leave out the scenes of him blushing remembering him when he was 5 years old
Or stop asking for morals in a literal porn manga?
This isn't your average porn doe it's clearly trying to build upon its characters so criticism is valid for that.
No offense but the "writing" part of it is so obviously used just to fuel the sex scenes.
It provides some context to the characters, but is that the focus? No
They had a misunderstanding in the beginning = leads to make up sex
Brother visiting = leads to either hidden sex or more intense sex due to holding for so long
In other words it all boils down to the sex scenes which is the core of the manga.
And once a series is a sex focus one, its kinda free real estate, because at the end of the day the other info are there to fuel kinks of different people, which is demonstrated on the number of common tropes that was presented so far
That's a bad take as lot of these stories that are mainly just sex for example full volume can still tell meaningful stories and doesn't mean pedophilia can just be ignored. This technically is a manga not fully a hentai so I'm going to criticise it like a normal story
People really do be trying to pull a morale high ground with the age gap when this is obviously very focused on demn sex scenes.