The main distinction of porn with a story genre from regular porn is the presence of a coherent narrative. Regular porn often jumps straight to the sexual action, while the story genre tries to add some kind of story framework around it. But in the end, both are adult-oriented and feature explicit sexual content.
Well, it's hard to say for sure. The concept of 'porn-like' is quite subjective. Some might consider certain novels with excessive sexual descriptions as such, but it depends on individual perspectives and cultural standards.
In many places, 18+ porn comics are considered illegal. This is because they can have a negative impact on society and violate moral and legal standards.
There might be a young and adventurous elf who becomes Harry's friend. This elf could be named something like Lyra. She could show Harry all the secret places in the elven territory and introduce him to other elves. There could also be a powerful elf leader, perhaps named Thranduil, who at first is suspicious of Harry but later comes to respect him.
Big ass cartoon porn usually focuses more on emphasizing the size and shape of the character's rear end. Regular cartoon porn might have a wider range of themes and focuses.