In some fanfictions, Sonic could be crying because of a misunderstanding among his friends. For example, his friends might think he has betrayed them due to some false evidence planted by Eggman. Sonic's tears in this situation would show his pain at being wrongly accused and his deep love for his friends.
There might be a fanfiction where Sonic is injured severely during a fight with a powerful new enemy. Unable to move and in great pain, Sonic cries out of frustration and fear. This kind of story can explore his inner thoughts and how he copes with his own vulnerability. It could also lead to a story arc of his recovery and revenge against the enemy.
Betrayal is also a common theme. If someone they trust betrays them, Sonic and Tails would be deeply hurt and likely to cry. This shows their vulnerability. Also, the theme of feeling powerless. When faced with a force too strong for them to handle, like a powerful new enemy, they might cry in frustration and fear. It adds depth to their characters as they are not always the invincible heroes.
One interesting Sonic x Sonic.exe fanfiction could be about Sonic trying to free his friends from Sonic.exe's dark influence. In this story, Sonic uses his speed and wits to outsmart Sonic.exe in a series of challenges.
Maybe Sonic is crying because of a big loss or a sad event in the story.
Perhaps there's a sad event in the comic's storyline that triggers Sonic's tears. It might involve a betrayal or a tragic situation.
There's a fanfiction called 'Shattered Dreams' where Sonic is put in a situation that makes him break down and Tails has to be strong for both of them, but he also has his own moments of crying. It's really good at showing their friendship through tough times. Also, 'The Weeping Hedgehog and Fox' is a story that delves into their past traumas and how it surfaces in a moment of crisis, causing them to cry and lean on each other.
First, understand Sonic's character. He is a brave and confident hero, so for him to cry, there must be a really strong reason. It could be a situation that challenges his abilities and beliefs deeply. Second, describe the setting well. If it's a dark and desolate place where he's alone and facing a great threat, it can enhance the emotional impact. For example, if he's in a collapsing ancient temple with no way out and his friends are in danger.
There are fanfictions that focus on the relationship between Sonic and his friends in the context of Sonic Unleashed. For example, a story where Tails tries to find a way to permanently separate Sonic from his Werehog form because he's worried about Sonic's well - being. Or a story where Knuckles and Sonic have an adventure together in one of the areas from the game, and they learn more about each other's strengths and weaknesses during the journey.
A really cool Sonic and Eggman fanfiction could be set in an alternate universe. In this universe, Sonic is not the hero he is in the main canon. Instead, he's more of an anti - hero, and Eggman is the one trying to save the world from Sonic's reckless behavior. It flips the traditional roles and makes for a very engaging read.
One interesting Sonic and Wave fanfiction could be about their unexpected alliance. Maybe in a story where they have to team up to face a common enemy that threatens both their worlds. They start off distrusting each other but gradually learn to respect and rely on one another.
One interesting Sonic Romance Fanfiction could be about Sonic and Amy. In many of these stories, they might go on adventures together and their relationship deepens. For example, they could be exploring a new zone and Sonic realizes how much he values Amy's courage and determination. Another could involve Sonic and a new character, where they meet in a unique situation like during a music festival in Sonic's world. The new character might initially be a bit of an enigma to Sonic, but as the story progresses, they develop a strong bond.