hentai that depicts things that would be illegal and/or unethical for live actors is fine, actually. Fictional characters are not people, and do not need protection like real people do. It is ok if you don’t like it, you don’t have to watch it, nobody was hurt in the making of it so it’s fine. Furthermore, just as it has been proven time and time again that violent video games do not create mass murderers, porn doesn’t create rapists. The ability to separate reality from fiction is critical to being a functional adult.

a caveat:

If the fictional character is an obvious stand in for a specific real person, or if the character was specifically drawn to have the likeness of a specific real person, then there might actually be problems.