To be honest, I haven't come across many highly popular slime girl possession stories in the mainstream media. But that doesn't mean they don't exist in some more specialized or emerging forms of media. For example, in some new webcomics or small - scale digital art projects, there could be interesting takes on this idea that are starting to gain a following among a niche audience.
One common theme is the loss of self - identity. As the slime possesses the girl, she gradually loses who she is. Another theme is the struggle between the girl and the slime for control of her body and mind. Also, there's often a sense of the unknown and the creepy, as slime is an unusual and somewhat icky thing to be possessed by.
There could be a slime girl possession story set in a scientific laboratory. A slime - like substance is being experimented on. One day, a female scientist accidentally gets exposed to the slime. The slime starts to possess her. It gives her enhanced physical abilities but also changes her personality. She becomes more aggressive and less empathetic. Her colleagues notice the changes but are unable to stop the slime's influence on her until they find a way to reverse the possession process.
A slime girl possession story could be about a girl who has some sort of connection with slime and gets possessed by an unknown force related to the slime. Maybe it's a supernatural entity within the slime that takes over her body and mind, leading to strange behaviors and events.
Yes, they are somewhat common. Many classic and contemporary novels explore themes of intense passion and possession in an erotic context. For instance, some works of romantic literature often contain elements where characters are consumed by their love, which can be seen as a form of possession.
Another theme could be redemption. The possessed character may have made some mistakes in the past, and the possession becomes a form of punishment or a test. Through the process of dealing with the possession, they find a way to atone for their sins and become a better person. For instance, in a story where a person is possessed by a spirit that represents their guilt, they gradually face their past and make amends.
Yes, there are significant ethical issues. Such stories objectify and sexualize a part of the human body in a way that is disrespectful to individuals. It goes against the principles of respecting human dignity and equality.