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.
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.
Sakura is typically shown as intelligent and determined in these fanfics. Her development from a somewhat insecure girl to a confident ninja is often explored. Kushina is characterized by her boldness and tenacity. When they are in a fanfic together, their relationship can vary. It could be a friendship where they bond over their love for the village or their shared experiences with difficult situations. Maybe Sakura admires Kushina for her strength and Kushina sees potential in Sakura, leading to a relationship of mutual respect and support.