Well, the drunk state of Stan can act as a catalyst. When drunk, Stan might be more vulnerable and honest. Kyle could be initially hesitant but gradually start to understand Stan's true feelings. Their relationship could develop through Kyle's growing acceptance of this new side of Stan.
They could also be brought together by external factors. Say there's a new kid in town who starts causing trouble for both of them. They have to team up to deal with this common enemy. During this time, they learn to communicate better. Kyle teaches female Cartman some of his problem - solving skills and she, in turn, shows him how to be more assertive in a different way. Through these shared experiences, their relationship can develop in a believable way.
Maybe Stan gets drunk during a camping trip with Kyle. In his drunken state, he becomes overly affectionate towards Kyle. Kyle is embarrassed but also finds it endearing. This could lead to a series of comical and heart - warming moments as they deal with Stan's drunken behavior and their emerging feelings for each other.
Their relationship can be developed through shared adventures. For instance, when they go on a quest to find a lost relic. During this adventure, they rely on each other's skills, which builds trust.
It could start with a mutual respect for each other's abilities. Naruto might admire Tayuya's musical based attacks, and Tayuya could be intrigued by Naruto's never - give - up attitude.
By showing their shared history. Maybe start with a flashback of their childhood together, how they were friends or rivals from the start. This can set the foundation for their complex relationship in the present of the fanfic.
Another way is through a common enemy. Suppose a new dark force emerges that threatens both Tikal's spiritual realm and Chaos's domain. They are forced to put aside their initial differences and work together. During this process, they start to communicate more, share their feelings and fears. Tikal helps Chaos to control its power better, and Chaos gives Tikal the strength to face the new threat, thus strengthening their relationship.
In a fanfic, their relationship could develop through a series of magical duels. Each duel is not just about fighting but also about learning about each other. Harry might learn about Bellatrix's past that made her the way she is, and Bellatrix could be impressed by Harry's growth as a wizard. This understanding gained from the duels could lead to a more complex relationship between them.
Another way is through an accidental encounter that leads to a series of events. Let's say Darkrai accidentally enters Cressila's territory while fleeing from a group of hunters. Cressila is initially angry but realizes that Darkrai is in trouble. It decides to help Darkrai hide. During this time, they start to communicate. Darkrai is intrigued by Cressila's kindness, and Cressila sees that Darkrai is not as bad as it seems. From there, their relationship blossoms as they continue to interact and face new challenges side by side.
Their relationship could develop through shared experiences. For example, if they both get caught in a trap set by a third party, they have to rely on each other to escape. This would force them to communicate and start to understand each other.
By showing their shared history. Flashbacks to their early days together can add depth. For example, remember when they first met? That could be a great starting point to build on their relationship in the fanfic.