One possible plotline could be that male Ariel saves Eric from a different kind of danger at sea. Instead of the traditional story, male Ariel uses his unique merman abilities to rescue Eric. And then they start to form a bond based on that event.
A possible plot could be that there is a magic spell that forces Eric and male Ariel to be together to break it. At first, they are hesitant, but as they spend time together, they discover that they have a lot in common. They face challenges together, like dealing with the disapproval of their respective communities. Through their journey, they fall in love and find a way to break the spell and be together.
One possible plotline could be that Ariel and the urchin are from different worlds and they have to overcome various obstacles to be together. Maybe there are cultural differences between their species that they need to navigate.
One possible storyline could be that Ariel and Eric face challenges during Ariel's pregnancy. Maybe Ariel has a hard time adjusting to life on land while being pregnant. For example, she might miss the ocean and the freedom it gives her. Eric, on the other hand, could be overprotective, not wanting Ariel to do anything that might harm her or the baby. This could lead to some small conflicts between them, but in the end, they work through it and are excited for the arrival of their child.
I'm sorry, I don't have a specific 'male ariel x eric fanfic' to recommend directly. You could try searching on fanfic platforms like Archive of Our Own. There might be some creative works there that explore this pairing.
Maybe the plot involves a celebration in the underwater kingdom. Ariel has brought Eric there, and the whole place is filled with joy. In the midst of the celebration, they find a quiet corner. Ariel looks at Eric with those big, beautiful eyes of hers, and they make out. This could symbolize the union of their two worlds, the human and the mermaid world.
Another common theme is discovery. Since Ariel is from the sea and Eric is from the land, they are constantly discovering new things about each other's worlds. Fanfics play with this idea a lot, like Ariel showing Eric the wonders of the ocean or Eric introducing Ariel to the joys of the land.
One challenge could be the reactions of their families. Their families might have different expectations or concerns. Another could be the fear of the unknown, like potential problems during the pregnancy.
Perhaps the fanfiction has a plotline where Eric has a special power that he doesn't know how to control. Alan, through his mentorship, helps him master this power. This could involve a series of training sessions and self - discovery for Eric. As they progress, their relationship deepens and they become an important part of each other's lives in the Kuroshitsuji setting.
One possible plotline could be that they meet during some sort of inter - galactic event. Maybe Gohan is there to protect Earth from a threat that also involves Blackfire's planet, and they end up having to work together. Along the way, they start to develop feelings for each other.
A plotline could involve Ayane being a mysterious figure who has some unique power. Naruto is intrigued by her and tries to get to know her better. As they interact more, they find themselves falling in love. Maybe there's also a villain who wants to use Ayane's power for evil, and Naruto has to protect her.
A plotline could involve a magical artifact that has the power to change the fabric of different universes. Naruto, Mirajane, and Erza are all drawn to it for different reasons. Naruto wants to use it to protect his village, Mirajane to protect her guild, and Erza for the sake of justice. As they fight over the artifact at first, they realize that a greater evil is trying to use it for destruction, so they join forces. Along the way, they learn about each other's worlds and cultures, and their relationships grow.