can you put into words what the supposed contradiction here is?
Idk what you mean by this.
It's not a contradiction, it's just how it is.
Now, the fact is that grouping eroticism with innocence is a pretty sus sign of a fetish, and not the "ok" kind. We know that is something impossible to actually exist, at the end of the day it's all perversion.
Pornographic content of any kind has been proven to be a problem since forever, it creates social, mental, physical and relationship problems. The simple japanese culture of mangakas and "otakus" to see such type of content as normal and deserving of praise to whoever makes/reads is a huge problem.
Just look at the amount of lolicon/shota content that exists and people display those with pride.
Like I said, I hope the guy develops to a better side of that industry and personal life. Since this is a 16 years old girl with a 24 years guy type of romance, I also expect the "but it's legal there" argument to not exist and see people with an actual moral compass.
Or idk, I'm expecting too much from the author of Horimiya, my favorite romance manga ever.