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.
No. Ethical BDSM is built on the foundation of informed consent. Forced stories imply non - consensual actions which go against the basic principles of BDSM.
One common type is role - playing. Like the online boyfriend being a dominant figure such as a strict boss and the partner being the submissive employee. Another is the use of restraints, even if it's just symbolic, like using ribbons to represent handcuffs during video calls.