Another way their relationship could progress is if they are forced to take care of a young or injured Spectrobe together. This shared responsibility would make them rely on each other more, and they would start to notice the little things about each other, like how caring and determined the other is. This would gradually lead to a romantic relationship.
One idea could be that Rallen and Jeena are on a mission to a new and dangerous planet in search of a rare Spectrobe. Along the way, they face challenges that test their relationship and teamwork. Maybe they get separated and have to find their way back to each other while also dealing with the local wildlife and environmental hazards.
One common theme could be adventure. If they are characters in a world full of action and exploration, fanfic writers might focus on their joint adventures. Another could be romance, as it is a popular theme in fanfics. Writers may explore the budding relationship between Rallen and Jeena.
There may not be a widely known 'rallen x jeena fanfic' in general. However, if it's a relatively niche or new pairing, it could be that fans are just starting to write about them. You could join relevant fan communities or forums where fans discuss and share their works. They might be able to point you to some good 'rallen x jeena fanfic' that they have come across.
You can develop their relationship through shared challenges. For example, if they face a common enemy or a difficult task like decrypting a dangerous code together. This forces them to rely on each other and builds trust.
Their relationship can develop through mutual respect. Gohan respects Android 21's strength and intelligence, while Android 21 respects Gohan's kind heart. This respect can turn into friendship first. For example, they train together, learning from each other's fighting styles. Then, as they spend more time together, they start to notice little things about each other that they like, which gradually leads to a romantic relationship.
To develop their relationship, you can create situations that force them to rely on each other. Say there's a magical storm that endangers Brulee's home. The OC steps in to help her protect it. This creates a sense of indebtedness and closeness. Also, include some tender moments, like the OC bringing Brulee a special treat from their travels. These little things add depth to their relationship.
Their relationship can develop as Rouge shows empathy towards Shadow's depression. She might start by just being a listening ear. As time passes, Shadow begins to trust her more and opens up. This trust can then turn into a deeper connection, and they may start to rely on each other more.
Their relationship could develop through mutual respect. For example, when Fem Zoro shows her swordsmanship skills in a fight and Sanji sees how brave and capable she is. He starts to respect her more than just as a female crewmate.
Their relationship can develop through mutual respect. Naruto respects Yugito's strength as a jinchuriki, and Yugito comes to respect Naruto's determination and growth. For example, in a battle situation, they see how the other fights bravely and this earns them respect for each other.
Their relationship could develop through shared experiences. For example, if they both participate in a difficult training session together. Naruto's coldness might initially be a barrier, but as they push each other to improve, he starts to warm up to Ino.