It depends. If the stories contain explicit sexual content intended for sexual arousal, it could be considered porn. But if they are more about romantic or sensual aspects, not necessarily.
It's a rather unusual and potentially risqu茅 concept. Maybe it involves the alien's interactions and conflicts in the town while dealing with the unique dynamic of having fairy parents.
One possible storyline could be that Ben accidentally swaps bodies with an alien species and has to deal with the new physical form while also trying to reverse the swap to save the day. Another could be that there is a villain who causes body swaps among the main characters for their own devious plans, leading to a lot of chaos and character development as they adapt to their new bodies.
Ben Tennyson would definitely be one of the main characters as he is the central figure in the Ben 10 series. Gwen, his cousin, could also be involved as she is often by his side in the original series. Kevin Levin might also be part of it, especially if the story involves a more complex web of body swaps and relationships among the main characters.
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.