Definitely not. Fanfiction is often read by a wide range of audiences, including minors in some cases. Including such explicit and inappropriate content violates the basic norms of decency and can also have a negative impact on the fan community as a whole.
One major ethical concern is the potential exposure to inappropriate content, especially for younger readers. Fanfiction platforms are often accessed by people of various ages, and this type of content violates the principle of providing a safe and appropriate reading environment.
Writing about sexual arousal in a detailed and explicit way in fanfiction is generally not appropriate as it often violates ethical and moral guidelines, not to mention it may be against the rules of the platform where it is hosted.
One ethical issue is that it can be considered a form of objectification. By focusing on a sexual aspect in this way, it reduces the character to a mere sexual object rather than a fully developed fictional entity with various qualities.
Well, the plot could involve Marco suddenly getting super strength. He might start by accidentally breaking things around him. Then, he could learn to control his power and use it to protect his friends from some sort of villains in his town. Maybe there's an evil wizard causing trouble and Marco, with his newfound strength, is the only one who can stop him.
Perhaps in this fanfiction, Marco and Star have been secretly in love for a long time. One day, after a particularly romantic encounter, Star discovers she's pregnant. They then embark on a journey to prepare for the baby, facing challenges such as how to combine their different worlds' cultures and traditions for the upbringing of the child.
It could be an evil scientist. This scientist was conducting experiments to create superhumans, but his experiments went wrong. Now, he's jealous of Marco's natural - born powers. So, he tries to capture Marco and study him to find a way to replicate his powers for himself. The scientist creates all kinds of dangerous traps and robotic minions to try and catch Marco.
Well, one possible plot could be that Marco and Higgs are in a relationship in a fictional universe. They might have some adventures together first, building a strong bond. Then, an unexpected pregnancy occurs which throws their lives into chaos. They would have to deal with the reactions of their friends and family, and also figure out how to prepare for the new life coming.
Some fans might be really excited as it adds a new and dramatic twist to the relationship between Marco and Star. They would be eager to read more about how the story unfolds and how the characters develop in this new situation.
This is completely inappropriate. Fanfiction is a form of creative writing, but it should not cross the line into creating disturbing or inappropriate content. There are many other positive and creative aspects of the relationship between Star and Marco that can be explored in fanfiction, like their friendship or adventures together, without delving into such improper areas.