Another common theme is the breakdown of sanity. The constant fear and oppression in an 'esclave horror story' can drive the enslaved characters mad. They start to hallucinate, lose their grip on reality, and become a shadow of their former selves. This not only affects the characters directly but also creates a more eerie and disturbing atmosphere for the audience as they watch the characters' mental decline.
In an 'esclave horror story', perhaps there is a group of people who are enslaved by a cult. The cult uses dark magic and makes the slaves perform grotesque rituals. The slaves are constantly in fear of being sacrificed or tortured in the name of the cult's evil deities. They are in a state of complete horror, with no way to escape the clutches of the cult.
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.