Another reason could be unrequited love. If the reader has feelings for Yoongi but he doesn't feel the same way (or vice versa), it can create a very painful and emotional situation. The disappointment and sadness of not having those feelings reciprocated can lead to crying.
One possible reason could be a deep emotional connection that has been severed. Maybe they had a fight or a misunderstanding that led to heartbreak. For example, if Yoongi had to leave suddenly for a long tour and the reader felt abandoned, it could lead to a very sad situation where both might cry.
A memory from the past might be the cause. There could be a traumatic event in their shared history that resurfaces. It might be something that they thought they had moved on from, but when it came back to haunt them, it brought out their emotions and made them cry.
One possible reason could be a heart - breaking separation. Maybe they had to part ways due to unforeseen circumstances like one of them having to move far away for work or family reasons. Another reason might be the loss of a beloved pet. If they shared a furry friend, its passing could be a source of great sorrow. Or it could be a misunderstanding between them that led to an argument and then regretful crying when they realized their mistakes.
One possible reason could be differences in opinions about their future plans. Maybe Min Yoongi wants to focus more on his career and the reader feels left out or wants more time together. Another reason might be jealousy. If Min Yoongi is getting a lot of attention from fans, the reader could feel insecure.
It could be that she faced a huge disappointment, like not getting into her dream school or losing a competition she worked really hard for. Also, heartbreak from a relationship gone wrong could be a reason.
Maybe she lost someone she loved deeply, like a family member or a best friend.
The reader was a dancer and was practicing in a studio. Yoongi was also there for some music work. They noticed each other from afar. Yoongi was attracted to the reader's grace. He approached the reader and asked if they could collaborate. As they worked together, they grew closer. There were late - night conversations, and they started to fall in love. Yoongi would surprise the reader with little gifts, and they would spend every spare moment together.
It could be jealousy. If Min Yoongi is interacting a lot with other people, the reader might feel jealous. Also, stress can play a role. If they are both under a lot of stress, they might lash out at each other more easily. Maybe Min Yoongi is stressed about his music career and the reader is stressed about their own work or studies, and this leads to an argument.
They could communicate openly. By talking about their feelings, they might be able to resolve their differences or misunderstandings. For instance, if it was a fight that made them cry, sharing their perspectives can lead to forgiveness and a stronger relationship.
There was a festival going on. Yoongi and the reader were there having a great time. Yoongi bought the reader a flower crown and as he placed it on their head, he also planted a soft kiss on their forehead. Then, he took the reader's hand and they started dancing in the street, their bodies moving in sync. Their PDA was a beautiful display of their love for each other, and everyone around them could feel the love in the air.
One reason could be extreme emotional pain. Maybe he witnesses the death of a very close friend or loved one in the fanfiction world. This overwhelming grief could cause such a physical manifestation as crying blood.