They might be characters from a specific genre of story. For instance, if it's a romantic comedy, Sonny could be a bubbly girl and Chad a bit of a shy but charming guy. They could be neighbors or coworkers, and their relationship develops in a humorous and heartwarming way.
Sonny might become more confident in her relationships. The kiss could make her realize that she can be bold in matters of the heart. Chad, on the other hand, might become more vulnerable. He has always been a bit of a ladies' man, but this kiss could change his approach to relationships.
Sonny might be a werewolf pup who has a problem with Mommy, who could be Leah as a mother - like figure in the werewolf pack. The 'shut up' comment could stem from Sonny's disagreement with Mommy's decisions regarding pack matters, like how to deal with the vampires in their territory.
Love and relationship building are very common themes. Since they are a couple, most fanfictions explore how they strengthen their bond, overcome obstacles in their relationship, and grow together.
Sure, 'Sonny's Blues' is indeed a short story. It typically has a focused plot and a limited number of characters and events, which are common characteristics of short stories.
It's hard to say for sure. If the story is unique, has interesting characters, and keeps readers hooked, it might gain popularity. But if it lacks those elements, it might not.
Sonny's Blues is fictional. The author crafted the story to explore various aspects of human experience and relationships through imagination and literary devices.