Perhaps Boruto cries when he realizes he has made a big mistake that has put his friends in danger. He is a character who values his friendships deeply, and the thought of harming his friends would be a huge blow to him. He might also cry when he witnesses the destruction of the Hidden Leaf Village or when someone he cares about gets seriously injured.
Well, perhaps in a fanfiction, Sasuke could cry for Sakura when he discovers a deep secret she has been hiding. Maybe it's something that makes him understand her on a whole new level, like a hidden pain she has endured all this time for his sake. This newfound understanding could stir such strong emotions in him that he can't hold back his tears.
One possible scenario could be when Lupin has to leave Hogwarts due to his werewolf secret being revealed more widely. He might cry because he has found a sense of belonging there, with his friends and students. He loves teaching and seeing the young wizards grow, and leaving all that behind is heart - breaking for him.
One scenario could be that Wendy's Pokemon was stolen by a villain. This would be a very distressing situation for her as she would be worried about the safety and well - being of her Pokemon.
It could be when they find out some bad news about the war against Voldemort. Like if they learn of a major defeat of the Order of the Phoenix. Hermione, being highly empathetic and feeling the weight of the situation, breaks down on Harry's shoulder as he is the symbol of hope in their fight and she needs that connection to keep going.
One possible reason could be remorse. Harry might realize that he misjudged Snape all along. Snape had a complex role, and if Harry discovers the truth about Snape's true loyalties and sacrifices, it could lead to him crying out of guilt for how he treated Snape in the past.
The theme of self - discovery can also be associated with Boruto crying in fanfiction. As he grows and learns more about himself and his abilities, there may be moments of confusion and fear that result in tears. For example, when he discovers a new power within him that he doesn't know how to control. Also, the theme of loss is common. If he loses a friend or a mentor, it would be a very emotional moment for him and crying would be a natural reaction.
One possible reason could be that he is lonely. In many fanfictions, Naruto is often ostracized as a baby due to the Nine - Tails inside him. He might be crying because he feels the lack of a warm, loving presence around him.
One scenario could be that he's under the Cruciatus Curse. This curse inflicts intense pain, and Harry has faced it before. In a fanfic, it could be used by a new dark wizard adversary, making Harry cry out in agony.
One scenario could be Naruto being forced to choose between the safety of the village and Boruto's life in a dangerous situation. Maybe he has to send Boruto on a near - impossible mission for the greater good, which really hurts Boruto as he feels abandoned by his father. Another could be Naruto being under a genjutsu and unknowingly attacking Boruto, causing physical and emotional harm.
One possible scenario could be in a great battle against an extremely powerful enemy. Maybe Naruto uses up all his chakra trying to protect the village from a huge threat like a new and terrifying Akatsuki-like organization. His body just gives out from the overexertion.